Skocz do pozycji: 1.

Tytuł:

Significance of the receding contact angle in the determination of surface free energy

Autorzy:

Chodkowski, Michał Paweł

Powiązania:

https://bibliotekanauki.pl/articles/2079958.pdf

Data publikacji:

2018

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

receding contact angle
equilibrium contact angle
Tadmor’s contact angle
CAH
surface free energy

Opis:

Surface free energy measurements of solids are a very important issue in various fields of science. Many functional, chemical and physical properties of a given material depend on its surface free energy. The basic method of the surface free energy determination are the contact angle measurements. There are several empirical methods useful to calculate the surface free energy of solids. They are based on the measurements of the contact angle of liquids with the defined surface tension. The aim of this paper is to examine the significance of the receding contact angle measurements in the determination of surface free energy of solids.

Źródło:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2018, 73, 1; 61-80
2083-358X

Pojawia się w:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 2.

Tytuł:

Theoretical Model of the Influence of Textile Structure on Wetting Hysteresis
Model teoretyczny wpływu struktury tkaniny na jej histerezę zwilżania

Autorzy:

Bachurová, M.
Wiener, J.

Powiązania:

https://bibliotekanauki.pl/articles/234300.pdf

Data publikacji:

2013

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Biopolimerów i Włókien Chemicznych

Tematy:

real contact angle
apparent contact angle
contact angle hysteresis
textile structure
rzeczywisty kąt zwilżania
pozorny kąt zwilżania
histereza zwilżania
struktura tkaniny

Opis:

In our work we theoretically analysed the influence of textile structure on the hysteresis of wetting. The situation with current fabrics is complicated and the properties of fibers, yarns, and geometric arrangement also influence their wetting. The basis of the theoretical model is a simple plain weave fabric made from monofilaments. From this model we determined the real contact angle and apparent contact angle, and later we compared these values with results from the experimental measurement.
W pracy przeanalizowano pod względem teoretycznym wpływ struktury tkaniny na histerezę zwilżania. Właściwości włókien, przędz i układ geometryczny mają wpływ na zwilżanie tkanin. Podstawą modelu teoretycznego jest tkanina o splocie prostym wykonana z monofilamentów. Wyznaczono rzeczywisty i pozorny kąt zwilżania, a następnie porównano otrzymane wartości z wynikami pomiarów eksperymentalnych.

Źródło:

Fibres & Textiles in Eastern Europe; 2013, 2 (98); 80-83
1230-3666
2300-7354

Pojawia się w:

Fibres & Textiles in Eastern Europe

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 3.

Tytuł:

Comparison of contact angle measurement methods of liquids on metal alloys

Autorzy:

Terpiłowski, Konrad
Hołysz, Lucyna
Rymuszka, Diana
Banach, Robert

Powiązania:

https://bibliotekanauki.pl/articles/763967.pdf

Data publikacji:

2016

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

metal alloys
wettability
contact angle

Opis:

The paper presents the studies of metal wettability using two methods: the sessile droplet and immersion ones. Based on the measured contact angles, there was calculated apparent surface free energy from the acidic–basic approach and the contact angle hysteresis. The advancing contact angles measured using the immersion method exhibit a little higher values than those measured by the sessile droplet method. The application of the immersion method leads to obtaining higher contact angle hysteresis. Both methods give different values of contact angles but they can be applied independently for estimation of metal surface wettability.

Źródło:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2016, 71, 1
2083-358X

Pojawia się w:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 4.

Tytuł:

Metahydrophobicity and orthohydrophilicity tested in flotation of NaCl, KCl, KPF6 in their saturated aqueous solutions

Autorzy:

Drzymala, Jan
Dubiel, Malgorzata
Ratajczak, Tomasz

Powiązania:

https://bibliotekanauki.pl/articles/109910.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

flotation
contact angle
hydrophobicity
hydrophilicity

Opis:

Flotation tests of different size fractions of NaCl, KCl and KPF₆ in their saturated aqueous solutions were performed in a 36 cm in height monobubble Hallimond tube. Also contact angle tests by means of sessile drops of saturated salt solution put on pressed discs of salts were carried out. The obtained sessile drop contact angles were equal to zero, pointing to a complete hydrophilicity (orthophilicity) of the investigated salts. In the case of NaCl and KCl, their orthohydrophilicity was confirmed by flotation tests and flotometric considerations because the entrainment factors, which take into account the maximum size of entrained particles and density of the salt as well as it solution, were similar to those of quartz and magnetite and equal to 0.11 mm. The entrainment factor for KPF₆  was equal to 0.18 mm and was greater than that of NaCl and KCl indicating certain natural flotation of this salt caused by some flotational hydrophobicity called in this paper metahydrophobicity. The metahydrophobicity of KPF₆   was confirmed by flotation results. In the case of KPF₆ the maximum yields of the same size particles were the highest, even though the density of this salt was greater than that of NaCl and KCl. Also, the first order kinetic constants were always the greatest for KPF₆. Further flotometeric calculation based on the balance of forces involved in flotation indicated that the estimated contact angle of KPF₆ was about 8 ^º assuming static flotation, and 7 ^º for dynamic flotation, while for NaCl and KCl was below 5 ^º . It means that during flotation test orthohydrophilic NaCl and KCl are only entrained while for metahydrophobic KPF₆ there is mostly entrainment and some flotation.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 5; 1141-1147
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 5.

Tytuł:

Influence of surface curvature on sessile droplet contact angle of nanofuids

Autorzy:

Cieśliński, J. T.
Krygier, K.

Powiązania:

https://bibliotekanauki.pl/articles/175339.pdf

Data publikacji:

2013

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

contact angle
nanofluids
substrate curvature

Opis:

This paper deals with the change in contact angle of droplets for three nanofluids, i.e., water- Al2O3, water-TiO2 and water-Cu. Nanoparticles were tested at the concentration of 0.01, 0.1, and 1% by weight. Although dispersants were not used to stabilize the suspension, the solutions tested exhibited satisfactory stability. Ultrasonic vibration was used in order to stabilise the dispersion of the nanoparticles. Experimental measurements were performed for horizontal stainless steel (316) tube of three diameters, i.e., 1.6, 3 and 5 mm, and flat stainless steel plates. The results obtained show that the contact angle of tested nanofluids depends strongly on nanoparticle concentration as well as the curvature of the substrate.

Źródło:

Transactions of the Institute of Fluid-Flow Machinery; 2013, 125; 3-12
0079-3205

Pojawia się w:

Transactions of the Institute of Fluid-Flow Machinery

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 6.

Tytuł:

Influence of Volume Drop on Surface Free Energy of Glass

Autorzy:

Rymuszka, Diana
Terpiłowski, Konrad
Hołysz, Lucyna

Powiązania:

https://bibliotekanauki.pl/articles/951384.pdf

Data publikacji:

2013

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

contact angle
surface free energy

Opis:

The aim of the research was to determine how the drop size affects the contact angle values and determine its optimal size for further contact angle measurements and comparison of the contact angle values measured for three probe liquids (water, formamide, diiodomethane) on the glass surface using the: sessile drop and tilting plate methods. Next, using the measured contact angles, the total surface free energy and its components were determined from the van Oss et al. (Lifshitz-van der Waals acid- base component, LWAB), Owens-Wendt, Neumann and contact angle hysteresis (CAH) approaches. The studies showed, that drop size is very important for contact angle measurements and consequently, for surface free energy estimation.

Źródło:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2013, 68, 1-2
2083-358X

Pojawia się w:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 7.

Tytuł:

Measurement of contact angle of copper-bearing shales using the captive bubble method

Autorzy:

Szyszka, D.

Powiązania:

https://bibliotekanauki.pl/articles/88887.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa

Tematy:

contact angle
hydrophobicity
hydrophilicity
flotation

Opis:

This paper describes the measurement of contact angle of the natural surface of copper-bearing shales immersed in solutions of selected reagents of various concentrations using captive bubble method. It demonstrates that the copper-bearing shales coming from Legnicko-Głogwski Copper Region develop natural hydrophobic properties in surfactant (frother) solutions and its hydrophobicity decreases from 82⁰ contact angle in distilled water, 78⁰ in C4E1 solutions, 76⁰ in C4E2 solutions, to 75⁰ in dodecylphenol solutions. These data show that the addition of frother causes a decrease of shale hydrophobicity but it can reduce stability of the thin film between the grain and air bubble. It means that flotation of copper-bearing shales in the presence of frother will only be possible provided specific concentrations.

Źródło:

Mining Science; 2014, 21; 83-94
2300-9586
2353-5423

Pojawia się w:

Mining Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 8.

Tytuł:

The use of computer image analysis in determining adhesion properties

Autorzy:

Krawczuk, A.
Domińczuk, J.

Powiązania:

https://bibliotekanauki.pl/articles/117841.pdf

Data publikacji:

2014

Wydawca:

Polskie Towarzystwo Promocji Wiedzy

Tematy:

computer image analysis
measurements
contact angle

Opis:

The paper discusses the use of computer image analysis in determining adhesion properties of materials, including the work of adhesion and surface free energy components. Also, it discusses methods and operators for edge detection employed in the determining of geometrical parameters which are then used as the basis for calculations. In addition, the paper presents an example of expanding the scope of investigations through the application of new IT solutions.

Źródło:

Applied Computer Science; 2014, 10, 3; 68-77
1895-3735

Pojawia się w:

Applied Computer Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 9.

Tytuł:

Effect of chitosan film surface structure on the contact angle

Autorzy:

Jagodzińska, Sylwia
Pałys, Beata
Wawro, Dariusz

Powiązania:

https://bibliotekanauki.pl/articles/2131497.pdf

Data publikacji:

2021

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

cellulose
chitosan
contact angle
films
microstructure

Opis:

The aim of this study was to evaluate the influence of the surface microstructure of chitosan films on the contact angle. Films without plasticising additives made of chitosan or regenerated chitosan were selected for the tests. A sessile drop method based on the European Pharmacopoeia was used to determine the contact angle. Due to the method of film production, the contact angle measurements were made on both the top and bottom surfaces of the film. For chitosan or regenerated chitosan films, the method of preparation slightly affected the difference in wettability between the top and bottom of the films, as confirmed by scanning electron microscopy. On the other hand, the wettability of the top and bottom of cellulose films varied greatly depending on the side of the film. Both chitosan and cellulose films had a homogeneous structure. There were differences in the microstructure between the top and the bottom of the sample in the cellulose film, a factor that affected the contact angle and thus the wettability of the surface.

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2021, 26; 89-100
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 10.

Tytuł:

Influence of surface topography and morphology of PU/PLA films on fibroblasts performance

Autorzy:

Bednarz, P.
Krok, M.
Laska, J.

Powiązania:

https://bibliotekanauki.pl/articles/285206.pdf

Data publikacji:

2012

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

contact angle
roughness
morphology
cell adhesion
fibroblasts

Źródło:

Engineering of Biomaterials; 2012, 15, no. 116-117 spec. iss.; 120-122
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 11.

Tytuł:

Determining the value of surface free energy on the basis of the contact angle

Autorzy:

Kłonica, M.
Kuczmaszewski, J.

Powiązania:

https://bibliotekanauki.pl/articles/102227.pdf

Data publikacji:

2017

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

energy state
surface layer
contact angle
ozonization

Opis:

This paper presents the results of tests concerning the value of surface free energy on the basis of measurements of contact angle with measure liquids: distilled water and diiodomethane. The surface of steel-316L samples was modified in an ozone atmosphere, and the concentration of ozone and the conditioning time of the samples in the reaction chamber were changed. The results of tests concerning the measurements of the value of surface free energy were subject to analysis. Also analysed were the components of SFE: the polar and dispersive components. The obtained test results were analysed in statistical terms. The paper ends with conclusions.

Źródło:

Advances in Science and Technology. Research Journal; 2017, 11, 1; 66-74
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 12.

Tytuł:

Design and Evaluation of the Thermal Properties of Di-, Tri- and Tetra-Azido-Esters

Autorzy:

Kumar, S.
Kumar, A.
Yamajala, K. D. B.
Gaur, P.
Kumar, D.
Banerjee, S.

Powiązania:

https://bibliotekanauki.pl/articles/358266.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Przemysłu Organicznego

Tematy:

azido-esters
energetic plasticizers
DFT
contact angle

Opis:

A group of polycyclic and aliphatic azido-esters (as energetic plasticizers) have been synthesized by simple synthetic routes and their molecular structures were confirmed by spectroscopic techniques. In addition, their thermal and rheological properties have been determined utilizing DSC, TGA, viscosity, and contact angle. Computational studies of these plasticizers have been performed by means of DFT (B3LYP/6-31G*) to estimate possible stable structures, energies, heat of formation, bond dissociation energies, IR and NMR spectra etc. Their compatibility with glycidyl azide polymer (GAP) binder was studied to explore their applicability in propellants. All of these molecules are novel and have been synthesized with the possibility of scale up.

Źródło:

Central European Journal of Energetic Materials; 2017, 14, 4; 844-860
1733-7178

Pojawia się w:

Central European Journal of Energetic Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 13.

Tytuł:

Some remarks on attachment of a gas bubble to another phase both immersed in water

Autorzy:

Kowalczuk, P. B.
Drzymala, J.

Powiązania:

https://bibliotekanauki.pl/articles/110908.pdf

Data publikacji:

2016

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

hydrophobicity
aquaoleophobicity
contact angle
liquid film
attachment

Opis:

In this paper the importance of definition of hydrophobicity and aquaoleophilicity in terms of contact angle as well as the properties of water films in flotation and oil agglomeration were briefly presented. It was shown that the hysteresis of contact angle for a considered system depends on the way of measurement and geometry of the system due to the presence of other that excess pressure and capillary forces and buffering properties of the capillary force. It was suggested that, the measured advancing and receding contact angles should be, when possible, recalculated into the Young (rest, equilibrium) contact angle. It was discussed that quartz is not a good model of hydrophilic surface because its contact angle with a gas phase in water is not zero and that a spontaneous attachment between highly hydrophobic materials such as hydrocarbons and Teflon in dynamic system, such as flotation, does not occur.

Źródło:

Physicochemical Problems of Mineral Processing; 2016, 52, 1; 147-154
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 14.

Tytuł:

Initial studies on lubricity and surface properties of selected ionic liquids

Autorzy:

Kałdoński, T. J.
Stańczyk, M.
Gryglewicz, Ł.
Kałdoński, T.

Powiązania:

https://bibliotekanauki.pl/articles/244598.pdf

Data publikacji:

2011

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

tribology
ionic liquids
surface tension
contact angle
lubrication

Opis:

The paper discusses the results of the studies on the surface properties and lubricating abilities of five ionic liquids compared to a high quality gear oil: Mobilube 1SHC 75W90 and two base oils: PAO-6 and SN-650. The investigated ionic liquids were: 1) tetrafluoroborate 1- benzyl-3-methylmidazolium, 2) bis (trifluoromethylsulfonyl) imide 3-methyl-1- propylpyridinium, 3) bis (trifluoromethylsulfonyl) imide 1,2-dimethyl-3-propylimidazolium, 4) bis (trifluoromethylsulfonyl) imide trihexyltetradecylphosphonium), 5) tetrafluoroborate trihexyltetradecylphosphonium. The density, surface tension and wetting angle as well as dynamic and kinematic viscosity were measured. Next, the lubricity properties were evaluated using the four-ball tester. The research results showed the more better lubricity properties of ionic liquids than the base oils. The research results showed the more better lubricity properties of ionic liquids than the base oils. The ionic liquids had the comparable properties to a high quality gear oil. Obtained results of these preliminary studies confirmed a possibility of using selected ionic liquids as new lubricants. These compounds can probably replace the lubricants used so far and find a wide scope of application in lubrication technology in the future. However, particular implementations require further complex studies.

Źródło:

Journal of KONES; 2011, 18, 1; 213-226
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 15.

Tytuł:

Investigations on lubricity and surface properties of selected perfluoropolyether oils

Autorzy:

Kałdoński, T. J.
Gryglewicz, Ł.
Stańczyk, M.
Kałdoński, T.

Powiązania:

https://bibliotekanauki.pl/articles/244618.pdf

Data publikacji:

2011

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

tribology
perfluoropolyethers (PFPE)
surface tension
contact angle lubrication

Opis:

In the paper the investigative results of lubricity and surface properties for four synthetic perfluoropolyether (PFPE) oils, comparing with the high quality gear oil Mobilube 1SHC 75W-90 and two base oils PAO-6 and SN-650, are discussed. The goal of the research was to identify anti-wear and anti-seizing properties of PFPE oils correlation with their surface-energetic and viscosity-temperature properties. Modern test equipment was used for perfomed research. The following apparatuses were used: KSV Sigma 701 and KSV CAM 100 made in Finland, AMVn Anton Paar made in Austria, and T-02 four-ball apparatus made in Poland. Measurement of density, surface tension and wetting angle were done with the use of KSV Sigma 701 apparatus, according to its instruction manual. The static wetting angle on the real surface of a steel plate was determined with the use of KSV CAM 100 apparatus. The dynamic viscosity of the tested compounds was determined with the use of AMVn microviscometer. The tests of the lubricity properties of the synthetic oils and comparative liquids were perfomed with the use T-02 four-ball tester. The investigative results showed that PFPE oils can be used particularly in hydrodynamic and elastohydrodynamic lubrication.

Źródło:

Journal of KONES; 2011, 18, 1; 199-212
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 16.

Tytuł:

An investigation of continuous interaction process between air bubble and various roughness coal surfaces using microbalance

Autorzy:

Guo, Zhimin
Yang, Jianguo
Wang, Yuling

Powiązania:

https://bibliotekanauki.pl/articles/1450050.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

surface roughness
air bubble
contact angle
continuous interaction

Opis:

Surface roughness of particles plays an important role in bubble-particle interaction process. However, the continuous attachment and detachment process have rarely been characterized between the surface of different roughness and air bubble. In this study, the continuous attachment and detachment processes between the surface of different roughness and air bubble were investigated by a highly sensitive microbalance. The bubble–surface interaction process was monitored by a high-speed camera to analyze the geometry parameters, including distance, adhesion diameter, and contact angle. It was found that the bubble-particle attachment time increased with the increase of surface roughness. The magnitude of the repulsive force in the bubble-surface approaching process increased with the increase of surface roughness, while the attractive force in the bubble-particle retracting process decreased monotonically with the surface roughness. The force measured by microbalance was finally compared with the calculated one. The calculated force at the biggest force point also increased with the decrease of surface roughness. These results indicate that coal particles with lower surface roughness, which have less water-filled pores and pillars, is more conducive to flotation due to the lower repulsive force in the bubble-particle attachment process and higher adhesive force in the bubble-particle detachment process, and vice versa.

Źródło:

Physicochemical Problems of Mineral Processing; 2020, 56, 1; 11-23
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 17.

Tytuł:

An effect of aromatic diluent addition on the selected properties of epoxy resin
Wpływ dodatku rozcieńczalnika aromatycznego na wybrane właściwości żywicy epoksydowej

Autorzy:

Hutera, B.
Drożyński, D.

Powiązania:

https://bibliotekanauki.pl/articles/263970.pdf

Data publikacji:

2005

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

kąt zwilżania
zwilżalność
spoiwo
contact angle
wettability
binder

Opis:

The article describes the studies which have been conducted on the dynamic wetting of quartz grains by EPIDIAN 5 resin and by this resin with an addition of 5 wt. %, 20 wt. % and 30 wt. % of xylene at different temperatures. In the case of the investigated resin, the wetting process dynamics is best described by a logarithmic function: theta = A Int + B0, where: theta is the contact angle after time t, and A and B0 are constants characteristic of this process at a given temperature. It has been proved that with 5 wt. % addition of xylene both constants assume a value different than zero. With addition of 20 wt. % and 30 wt. % of xylene, the State of equilibrium is reached almost immediately, and it is expressed by a zero value of constant A. The infrared spectroscopy did not reveal the presence of any chemical reactions between the EPIDIAN 5 resin and xylene, thus confirming that the chemical structure of xylene molecule affects the type of interaction and proves the non-active behaviour of xylene as a diluent. The importance of the studies for foundry sand practice has been stressed.
W artykule przedstawiono badania dynamiki zwilżania kwarcu przez żywicę EPIDIAN 5 z dodatkiem 5% wag., 20% wag. i 30% wag. ksylenu w różnych temperaturach. Dla przebadanej żywicy, proces dynamiki zwilżania najlepiej opisuje funkcja logarytmiczna: theta = - A Int + B0, gdzie: theta jest kątem zwilżania po czasie t, zaś A i B0 stałymi charakteryzującymi proces w danej temperaturze. Wykazano, że wartość obydwu stałych przy dodatku 5% wag. ksylenu jest różna od zera. Przy dodatku 20% wag. i 30% wag. uzyskuje się praktycznie natychmiastowy stan równowagi, któremu odpowiada zerowa wartość stałej A. Badania spektroskopowe w podczerwieni nie wykazały reakcji chemicznej pomiędzy żywicą EPIDIAN 5 a ksylenem, potwierdzając tym samym wpływ struktury chemicznej cząsteczki ksylenu na rodzaj oddziaływań i jego nieaktywny charakter jako rozcieńczalnika. Podkreślono wpływ przeprowadzonych badań dla praktyki mas formierskich.

Źródło:

Metallurgy and Foundry Engineering; 2005, 31, 2; 175-184
1230-2325
2300-8377

Pojawia się w:

Metallurgy and Foundry Engineering

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 18.

Tytuł:

Contact angle of copper-bearing shales using the sessile drop and captive bubble methods in the presence of selected frothers

Autorzy:

Szyszka, D.
Szczepański, W.

Powiązania:

https://bibliotekanauki.pl/articles/88891.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Wydział Geoinżynierii, Górnictwa i Geologii. Instytut Górnictwa

Tematy:

contact angle
hydrophobicity
hydrophilicity
flotation
copper-bearing shales

Opis:

This paper describes the measurement of contact angle of copper-bearing shales. The values of advancing and receding contact angles were determined using the sessile drop and captive bubble methods in the presence of aqueous solutions of acetal and pyridine and distilled water. Both methods demonstrated that the tested substances had only minor impact on the surface hydrophobicity of copper-bearing shales expressed by contact angle. The tests carried out proved that neither acetal nor pyridine may be classified to the collecting reagents because none of them improves hydrophobicity of copper-bearing shales. These reagents are only flotation frothers.

Źródło:

Mining Science; 2015, 22; 191-199
2300-9586
2353-5423

Pojawia się w:

Mining Science

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 19.

Tytuł:

Comparison of surface properties of anthracite coals before and after high temperature heating process

Autorzy:

Xia, W.
Xie, G.

Powiązania:

https://bibliotekanauki.pl/articles/951846.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

heating
coal hydrophobicity
XPS
SEM
BET
contact angle

Opis:

Surface property plays a very important role on coal hydrophobicity which determines flotation behavior of fine coals. However, coal spontaneous combustion makes coal suffer both oxidation and high temperature heating processes. Coals from the outside of coal piles primarily suffer oxidation (or combustion process) while coals from the inside of coal piles primarily suffer high temperature heating process. It is necessary to investigate the changes in surface properties of coal before and after high temperature heating process. In this investigation, X-ray photoelectron spectroscopy (XPS), scanning electron microscope (SEM), surface area (BET) and contact angle measurements were used to indicate the changes in surface properties of anthracite coal before and after high temperature heating process. Throughout this study, surface properties of coal changed significantly after high temperature heating process. Meanwhile, coal hydrophobicity can be also reduced after high temperature heating.

Źródło:

Physicochemical Problems of Mineral Processing; 2015, 51, 1; 205-212
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 20.

Tytuł:

Quantifying the spreading factor to compare the wetting properties of minerals at molecular level – case study: sphalerite surface

Autorzy:

Mohseni, M.
Abdollahy, M.
Poursalehi, R.
Khalesi, M. R.

Powiązania:

https://bibliotekanauki.pl/articles/109377.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

wettability
contact angle
molecular simulation
sphalerite
spreading factor

Opis:

Spreading of water droplet on sphalerite surface was quantified at molecular level and was utilized for comparison of the wetting properties of sphalerite protonated and hydroxylated surfaces. Molecular dynamic simulations were used to characterize the wetting of sphalerite (110) plane. Experimental contact angles of water droplet on sphalerite surfaces were measured and the results were compared with simulated contact angles to ensure that the simulations are accurate enough for calculation of spreading factors. Shape descriptors such as perimeter, area, Feret’s diameters and circularity were used to characterize the shape of droplet-sphalerite interface at molecular level. Using the shape descriptors, different spreading factors were defined and calculated spreading factors were correlated with simulated contact angle. It was shown that spreading factors which were defined as the volume of water droplet divided by the area and Feret’s diameters, with correlation coefficient of 0.98 and 0.97, can be used as accurate tools for wetting comparison of functionalized sphalerite surface at molecular scale. Proposed approach also can be used for investigations on the effect of surface chemical and physical anisotropies on preferred wetting in specific direction at molecular scales.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 3; 646-656
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 21.

Tytuł:

The influence of wettability on oil recovery

Autorzy:

Kulynych, V.

Powiązania:

https://bibliotekanauki.pl/articles/1203993.pdf

Data publikacji:

2015

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Wydawnictwo AGH

Tematy:

wettability
contact angle
relative permeability
EOR
two-phase flow

Opis:

Understanding the mechanism by which oil is displaced from the porous medium requires knowledge about the role of wetting and capillary forces during EOR. Knowledge of the effect of wettability on oil production is also a key point for understanding the behavior of multiphase flows in the reservoir. A literature review indicates that wettability is one of the ma in factors controlling and regulating the distribution of oil and water in the reservoir rock. Therefore, the resolution of problems associated with the calculation of oil resources, operation and analysis of core deposits, must take into account the wettability of rock. Therefore, the study of such phenomena as wettability is still valid today. In the paper reservoir rock wettability and its types were desc ribed. Direct and indirect methods of determining the wettability were characterized, the graph of capillary pressure is used to characterize the wettability. In order to determine the effect of wettability on multiphase flow in porous media are discussed petrophysical parameters: capillary pressure, relative permeability and hydrocarbon saturation of the rock. Characterized wettability of each of Characterized wettability of each of carbonate and sandstone reservoirs.

Źródło:

AGH Drilling, Oil, Gas; 2015, 32, 3; 493-502
2299-4157
2300-7052

Pojawia się w:

AGH Drilling, Oil, Gas

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 22.

Tytuł:

Influence of surface (nano)roughness on cell behaviour

Autorzy:

Piegat, A.
Fray, M. el

Powiązania:

https://bibliotekanauki.pl/articles/285111.pdf

Data publikacji:

2009

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

nanocomposites PVC / CNT
AFM
contact angle
cell/tissue response

Opis:

The influence of surface (nano)roughness of soft elastomeric materials containing nanocrystalline TiO2 on tissue cell behaviour after implantation tests was investigated. Addition of small amount (0.2wt.%) of TiO2into polymer matrix changed surface roughness giving material of well developed lamellar morphology and slightly diminished contact angle (wettability). This lamellar (fibrilar) morphology had strong influence on cell response after implantation into soft tissue indi-cating the absence of eosynophiles in tissue around implant.

Źródło:

Engineering of Biomaterials; 2009, 12, no. 89-91; 257-258
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 23.

Tytuł:

The energetic - superficial and lubricity properties of petroleum products and ionic liquids

Autorzy:

Kałdoński, T. J.
Kałdoński, T.
Pakowski, C.

Powiązania:

https://bibliotekanauki.pl/articles/244139.pdf

Data publikacji:

2009

Wydawca:

Instytut Techniczny Wojsk Lotniczych

Tematy:

boundary layer
lubricity
ionic liquids
surface tension
contact angle

Opis:

This paper presents the results of comparative investigations on the lubricity and energetic superficial properties of selected petroleum products and new ionic liquids (ILs). Three base oils from polish petroleum refinery (PAO—6, SN-650, SN—350) and lubricity additive (Additin RC2515 EP) have been investigated comparatively to four ionic liquids with imidazolium organic cations and different inorganic anions, i. e. bis (trifluoromethylsulfonyl) imide and tetrafluoroborate. The lubricating ability properties petroleum products and ionic liquids have been assessed according to Polish Standard PN-76/C-04 1 47 (ASTMD2596-69 and ASTM D2270-77) on Four-Ball Testing machine. The investigation range of lubricity properties are limited to the assessment only two parameters i. e. P(t) - seizure load for increasing continuous loading and G(oz) - wear limiting load capacity. The superficial properties of oil compounds and ionic liquids have been assessed by means of modern KSV Sigma 701 Tensiometer. Surface tension o and wetting angle fi were assessed. The obtained results confirmed the possibilities of using tested ionic liquids as lubricants. The best lubricity properties, close to properties of Additin RC2515, had 1—methyl— 3—oktyloxymethylimidazolium tetrafluoroborate.

Źródło:

Journal of KONES; 2009, 16, 1; 239-244
1231-4005
2354-0133

Pojawia się w:

Journal of KONES

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 24.

Tytuł:

Research on emulsified tyre pyrolysis oil as a coal flotation collector

Autorzy:

Yang, R.
Shen, L.
Wang, H.

Powiązania:

https://bibliotekanauki.pl/articles/109341.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

pyrolysis oil
coal flotation
contact angle
interaction heat
adsorption

Opis:

In this paper the possibility of using the pyrolysis oil derived from waste tyres as a collector in flotation of coal was evaluated. The pyrolysis oil was obtained at the initial and final pyrolysis temperatures of 400 and 700 oC, respectively, and the heat holding time of 30 min. Flotation results indicated that the pyrolysis oil emulsion showed stronger collecting ability than diesel and the concentrate ash content just slightly increased in comparison to flotation in the presence of diesel. The contact angle measurement and immersion microcalorimetry test correlated well with the flotation data. The Fourier Transform Infrared Spectroscopy results demonstrated that diesel and pyrolysis oil emulsion is physically adsorbed on the coal surface.

Źródło:

Physicochemical Problems of Mineral Processing; 2017, 53, 1; 279-287
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 25.

Tytuł:

Difference in flotation behavior of galena by single and multi-step chronoamperometric oxidation

Autorzy:

Ozdemir, Orhan
Hampton, Marc A
Nguyen, Tuan
Nguyen, Anh

Powiązania:

https://bibliotekanauki.pl/articles/110510.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

surface roughness
hydrophobicity
contact angle
elemental sulfur
galena
chronoamperometry

Opis:

The relationship between electrochemical oxidation (Chronoamperometry) of galena surfaces and collocterless galena flotation was investigated in detail. The chronoamperometry (CA) micro- flotation experiments and zeta potential experiments were performed with ground galena particles (106×53 μm). In addition, contact angle measurements were carried out with a freshly cleaved galena sample at pH 4 in order to investigate any changes in galena surface hydrophobicity after the surface oxidation electrochemically. The results from this study indicated that there is a strong link between the nano/micro-physico-chemical properties of a sulphide on galena surfaces and collectorless flotation of galena particles at pH 4. The results were also supported with the electrokinetics behavior and contact angle values of galena particles.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 3; 812-821
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 26.

Tytuł:

Wettability of shale rock as an indicator of fracturing fluid composition

Autorzy:

Ksiezniak, K.
Rogala, A.
Hupka, J.

Powiązania:

https://bibliotekanauki.pl/articles/110556.pdf

Data publikacji:

2015

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

shale rock
wettability
porous materials
hydraulic fracturing
contact angle

Opis:

Shales have become one of the main unconventional gas resources in the world. However, physicochemical properties of rocks are still at the center of research. There have been conducted major researches in wettability of shales by fluids and advances in understanding and control of shale rock wettability. Also influence of interfacial phenomena on a production capacity of reservoirs have been made. The aim of this study is to find a relationship between type of fracturing fluid used during shale gas recovery and shale rock wettability. The study is the first step to evaluate conditions, under which wetting occurs most intensely, how it can be controlled by changing a composition of fracturing fluid and how this composition effects the wetting mechanism. We present a characterization of porous materials by a capillary rise method to study shale wettability by water, oil and other fluids. This work describes the experimental contributions to understand the shale rock/fluid interactions through inquire of fluid role in wettability of shale rock.

Źródło:

Physicochemical Problems of Mineral Processing; 2015, 51, 1; 315-323
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

Artykuł

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Skocz do pozycji: 27.

Tytuł:

Wetting of surfaces with ionic liquids

Autorzy:

Poleski, M.
Luczak, J.
Aranowski, R.
Jungnickel, C.

Powiązania:

https://bibliotekanauki.pl/articles/110857.pdf

Data publikacji:

2013

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

ionic liquid
wettability
contact angle
capillary rise
surface interactions

Opis:

The paper focuses on assessing wettability of surfaces modified with ionic liquid solutions. Dialkylimidazolium chlorides have been selected as the test group, because of their immediate availabil-ity and limited previous research. Contact angle of selected ionic liquid solutions have been measured with two methods: capillary rise test and simplified sitting droplet analysis, performed by means of digital camera. During tests the extremely high viscosity of dialkylimidazolium chlorides has been observed to drop rapidly with prolonged exposition to atmospheric moisture and measured experimentally with Karl-Fischer titration and viscosity measurements. Contact angles of selected ionic liquids have been presented.

Źródło:

Physicochemical Problems of Mineral Processing; 2013, 49, 1; 277-286
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 28.

Tytuł:

Wettability of hybrid chitosan/phospholipid coatings

Autorzy:

Jurak, Małgorzata
Wiącek, Agnieszka E

Powiązania:

https://bibliotekanauki.pl/articles/1034545.pdf

Data publikacji:

2017

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

chitosan/phospholipid films
contact angle hysteresis
surface free energy

Opis:

Solution spreading and Langmuir-Blodgett/Schaefer techniques were used for preparation of chitosan/phospholipid (DPPC) films on air plasma treated polyethylene terephthalate (PET) plates. The surface wetting properties were determined based on the measurements of the advancing and receding contact angles of water, formamide and diiodomethane. The contact angle hysteresis model of Chibowski was applied to estimate the total surface free energy values. The coatings properties were found to be affected by molecular organisation and packing depending on the preparation technique. Phospholipid molecules modified the chitosan film surface by changing the kind and magnitude of interactions, which is revealed in the values of surface free energy. These findings may be helpful for the development of new generation polymer-supported biocompatible coatings with anti-thrombogenic and anti-bactericidal properties, thus expanding the spectrum of chitosan applications.

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2017, 22; 66-76
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 29.

Tytuł:

Wetting properties of the sodium bis(2-ethylhexyl) sulfosuccinate (AOT) and polyoxyethylene (23) lauryl ether (Brij 35) binary mixtures in the poly(tetrafluoroethylene)-solution-air system

Autorzy:

Krawczyk, Joanna

Powiązania:

https://bibliotekanauki.pl/articles/764089.pdf

Data publikacji:

2015

Wydawca:

Uniwersytet Marii Curie-Skłodowskiej. Wydawnictwo Uniwersytetu Marii Curie-Skłodowskiej

Tematy:

surfactant
polymer
contact angle
critical surface tension of wetting

Opis:

Wettability of poly(tetrafluoroethylene) (PTFE) by aqueous solutions of binary mixtures composed of sodium bis(2-ethylhexyl) sulfosuccinate (AOT) with polyoxyethylene (23) lauryl ether (Brij 35) was considered on the basis of the measured values of contact angle and surface tension. It was shown that the value of the critical surface tension of PTFE surface wetting at the studied system (23.5 mN/m), does not depend on the concentration and composition of the binary mixtures of studied surfactants in water, and it was higer than the surface tension of PTFE (20.2 mN/m). The best wettability of polytetrafluoroethylene (PTFE) by studied aqueous solutions of binary surfactants mixtures occurs at the mixtures concentration corresponding to the critical micelle concentration of their solutions.

Źródło:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia; 2015, 70, 1
2083-358X

Pojawia się w:

Annales Universitatis Mariae Curie-Skłodowska, sectio AA – Chemia

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 30.

Tytuł:

Zeta potential of Teflon in presence of monovalent and divalent ions

Autorzy:

Gulgonul, Ilhan

Powiązania:

https://bibliotekanauki.pl/articles/110571.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

polytetrafluoroethylene
PTFE surface
natural hydrophobic
zeta potential
contact angle

Opis:

In this study, the specific effects of Na+ and Ca2+ ions on natural hydrophobic Teflon particles and flat Teflon surfaces were investigated using zeta potential and contact angle measurements, respectively. The zeta potential measurements showed that the surface charge of Teflon was negative at all pH values in the absence of salt ions, and became the positive with the increased salt concentration, and obtained an iso electric point (iep) between pH 3 and 4. The results also indicated that Ca+2 ions more adsorbed on the Teflon surface compared to Na+ ions in the case of the compression of the electrical double layer. The contact angle measurements with Teflon sample showed that while the flat Teflon had a contact angle of 107° at pure water, and the contact angle considerably reduced as a function of salt concentration. This decrease was more effective in the presence of Ca2+ ions rather than Na+ ions. While calcium is a strong water structure maker cation, sodium is a weak structure maker cation, but the role of calcium is more effective at the Teflon-water interface according to zeta potential and contact angle measurements. It is revealed that the Ca+2 ions have a specific effect on Teflon surface due to low salt concentrations and ion charges. The different effects of these cations on Teflon-water interface can be attributed to use in mineral processing, especially in flotation enrichment.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 3; 792-801
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 31.

Tytuł:

Comparison of components and parameters of some sulfide minerals surface tension with regards to stability of mineral-air bubble system

Autorzy:

Jańczuk, Bronisław
Zdziennicka, Anna

Powiązania:

https://bibliotekanauki.pl/articles/1450639.pdf

Data publikacji:

2020

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

contact angle
wettability
surface tension
detachment force
sulfide minerals

Opis:

The measurements of the advancing contact angle of water, glycerol, formamide, ethylene glycol, diiodomethane, α-bromonaphthalene, 1,2,3-tribromopropane on unoxidized and oxidized galena, pyrite, chalcopyrite, djurleite, bornite and covellite at the temperature equal 293 K were made. Additionally, the measurements of the force air bubble detachment from these sulfide minerals including also chalcocite in water were performed. Using the values of the obtained contact angle of water, glycerol, formamide, ethylene glycol, diiodomethane, α-bromonaphthalene, 1,2,3-tribromopropane the components and parameters of the unoxidized and oxidized sulfide minerals surface tension were calculated. For this calculation the van Oss et al. method was applied after analysis of the components and parameters of the surface tension of liquids used for contact angle measurements. Taking into account the contact angle of water on the sulfide minerals, the detachment force of air bubble from these minerals in water was determined using our equation and comparing to that of measured one. As follows from the measurements and calculations the wetting properties of sulfide minerals and the stability of mineral-air bubble depends to a larger extent on the degree of sulfide minerals oxidation than on the type of mineral.

Źródło:

Physicochemical Problems of Mineral Processing; 2020, 56, 6; 22-31
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 32.

Tytuł:

Control of glass surface wettability via esterification with n-alkyl alcohols

Autorzy:

Kruszelnicki, Mateusz
Polowczyk, Izabela
Kowalczuk, Przemyslaw B.

Powiązania:

https://bibliotekanauki.pl/articles/2146948.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

hydrophobicity
surface free energy
contact angle
zeta potential
roughness

Opis:

Surface wettability plays an essential role in many processes and materials applications. It depends mainly on the surface roughness and chemical composition, thus through a controlled modification of these parameters, the wettability can be restrained. Glass is an inorganic solid material, composed mainly of amorphous silica, which surface, due to the presence of reactive hydroxyl groups, can be quite easily chemically modified. This feature can be used to control the wettability of glass by reaction with organic compounds. In this study, the esterification of glass silanol groups with n-alkyl alcohols (Cn/H2n+1/OH, n=3, 4, 6, 8, 10) was employed to modify its wettability. The effect of such modification on the physicochemical properties of glass surface was comprehensively investigated and characterised by the water contact angle, surface free energy, zeta potential, atomic force microscopy (AFM) and X-ray photoelectron spectroscopy (XPS) measurements. We demonstrate that the wettability of the esterified glass surface is strongly dependent on both the chain length of used alcohol and modification time. The alcohol molecule binds to the glass surface through a Si-O-C bond, leading to the formation of a monolayer that does not significantly affect the surface morphology and zeta potential. Conducted studies provided a broader view of the influence of this technique for modifying surface wettability on its physicochemical properties.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 2; art. no. 145147
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 33.

Tytuł:

Evaluation of fouling potential of nanofiltration membranes based on the dynamic contact angle measurements

Autorzy:

Gryta, M.
Bastrzyk, J.
Lech, D.

Powiązania:

https://bibliotekanauki.pl/articles/779112.pdf

Data publikacji:

2012

Wydawca:

Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie

Tematy:

nanofiltration
dynamic contact angle
fouling
Wilhelmy plate method
glycerol fermentation

Opis:

In this work the studies were performed on the intensity of fouling of the membrane NF90 and NF270 depending on the value of dynamic contact angle, previously determined for these membrane. The NF membranes were used for the separation of broth obtained during the fermentation of glycerol by Lactobacilluscasei bacteria. The measurements of dynamic contact angle were carried out using the Wilhelmy plate method. Taped membranes samples (support layer to support layer), wetted for 2 days in deionized water prior to testing, were used to study the contact angle of top layer and its organic fouling. Using deionized water; the contact angle values equal to 27-30o and 53-57o for NF270 and NF90, respectively, were obtained. As a consequence of adsorption of organic compound on the membrane surfaces, the contact angle obtained for both fouled membranes was about 55-56o, and this value was closer to the contact angle of non-fouled NF90 membrane. Therefore, the NF90 membrane was more resistant to organic fouling during the separation of broth.

Źródło:

Polish Journal of Chemical Technology; 2012, 14, 3; 97-104
1509-8117
1899-4741

Pojawia się w:

Polish Journal of Chemical Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 34.

Tytuł:

Structural modification of cellulose to enhance the flotation efficiency of fine copper oxide ore

Autorzy:

Gu, Guohua
Zhu, Renfeng
Chen, Zhixiang

Powiązania:

https://bibliotekanauki.pl/articles/109394.pdf

Data publikacji:

2019

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

fine malachite
collector
sulfuration flotation
contact angle
mean size
flocculation

Opis:

Using more efficient collector to improve the recovery efficiency of fine copper oxide has become imperative as the shortage of copper mineral resources. In this study, the new collector 3-hydroxy butyrate-carboxy methyl cellulose xanthate (HCMCX) was synthesized by carboxy methyl cellulose, 3-hydroxy butyrate and carbon disulfide, all of which as raw materials . The structural characteristics of HCMCX was detected by both infrared spectrum and ultraviolet spectrum. Besides, the interacting behavior between HCMCX and fine malachite was investigated through particle size analysis, contact angle measurements, and flotation tests. Particle size analysis indicated that the mean size of malachite was increased by 8 μm while the HCMCX concentration at 200 mg/dm3. The contact angle measurements demonstrated that, comparing with the collector AX at a same dosage, the mineral surface of malachite showed a stronger hydrophobicity after interacting with HCMCX. Microflotation tests results exhibited that the recovery of malachite was about 94% when the pulp pH 8 and collector concentration at 200 mg/dm3. The results of practical ore flotation tests showed that HCMCX could as an excellent collector for flotation of fine malachite, finally to achieve the concentrates containing 20% Cu and 88% Cu recovery.

Źródło:

Physicochemical Problems of Mineral Processing; 2019, 55, 1; 58-69
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 35.

Tytuł:

Electrokinetic and surface properties of some methacrylate-based copolymers

Autorzy:

Ersoy, Bahri
Çiftçi, Hakan
Evcin, Atilla
Merdivenci, Yılmaz

Powiązania:

https://bibliotekanauki.pl/articles/2146940.pdf

Data publikacji:

2022

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

methacrylate copolymer
zeta potential
contact angle
hydrophobicity
surface free energy

Opis:

In this study, some electrokinetic and surface properties of MBAOM-GMA copolymers synthesized from 2-[(methoxy-1,3-benzothiazole-2-yl) amino]-2oxoethyl methacrylate (MBAOM) and glycidyl methacrylate (GMA) monomers were investigated. Accordingly, (i) pH-dependent zeta (ζ) potential changes of the copolymers were investigated under a constant ionic strength (in 1.10-3mol/dm3 NaCl) and the corresponding isoelectric points (iep) were determined, (ii) zeta potential changes depending on the salt concentration in the presence of mono-, di- and tri-valent metal salts were examined, (iii) contact angles (θ) of the copolymers with water were measured and their wetting behavior was assessed, and (iv) surface free energies (SFE) of the copolymers were determined by Acid-Base approach using Van Oss-Chaudhury-Good method. The compositions of the copolymers were 77% MBAOM - 23% GMA, 45% MBAOM - 55% GMA, and 19% MBAOM - 81% GMA. FeCl3, CaCl2, and KCl salts were used for the salt solutions for the zeta potential measurements. As a result, (i) it was determined that the chemical structure of methacrylate copolymers showed a decisive effect on both electrokinetic and surface properties, (ii) the hydrophobic character of copolymer increased with the increase of the GMA ratio, and correspondingly, the SFE decreased, and (iii) the iep of the copolymers varied between pH 3.1-3.7 depending on composition.

Źródło:

Physicochemical Problems of Mineral Processing; 2022, 58, 5; art. no. 152162
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 36.

Tytuł:

Wetting properties of chitosan-modified and plasma-treated peek surfaces

Autorzy:

Przykaza, Kacper
Jurak, Małgorzata
Wiącek, Agnieszka Ewa

Powiązania:

https://bibliotekanauki.pl/articles/1034399.pdf

Data publikacji:

2018

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

PEEK
chitosan films
contact angle
plasma activation
surface free energy

Opis:

In this paper, the wettability of chitosan/phospholipid (1,2-dipalmitoyl-sn-glycero-3-phosphocholine – DPPC), chitosan/lipid (cholesterol – Chol) and chitosan/protein (cyclosporine A – CsA) films on air plasma activated polyetheretherketone (PEEK) plates was studied. The layers were prepared using the solution spreading technique and their surface wetting properties were determined based on the measurements of the advancing and receding contact angles of water, formamide and diiodomethane. Moreover, based on the contact angle hysteresis model of Chibowski, values of total surface free energy were estimated. Significant changes in PEEK polarity were observed after plasma activation and modifications with Ch/DPPC, Ch/Chol and Ch/CsA layers. These molecules modulate the chitosan film surface by changing the type and magnitude of interactions, which is revealed in the values of surface free energy. These results may be important for the development and implementation of highly biocompatible bone substitution polymers coated with chitosan film with anti-fungal and anti-bactericidal properties. Those systems based on chitosan may also carry and release biologically active substances which could be relevant in the new generation of drug delivery systems.

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2018, 23; 159-169
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 37.

Tytuł:

Damage risk of the raceway edge arise in four-point slewing bearing

Autorzy:

Krynke, Marek
Mielczarek, Krzysztof

Powiązania:

https://bibliotekanauki.pl/articles/973027.pdf

Data publikacji:

2019

Wydawca:

Stowarzyszenie Menedżerów Jakości i Produkcji

Tematy:

slewing bearing
contact angle
contact zone
łożyska wieńcowe
kąt zwilżania
strefa styku

Opis:

In the article some forms of damage to raceway of slewing bearings for single-row ball bearing slewing ring with four-point contact and their causes were shown. Changes of the contact angle and its influence on the geometry for contact zone of the rolling elements raceway were analyzed. An identification of changes for contact angle of individual balls for different parameters of the contact was received. It was showed that contact angles of some rolling elements were increasing. It can cause damage to the raceway by spalling or rolling out of edge of the bearing ring. Ways of avoiding too early damage to the raceway at the stage of the design and the selection of coronary bearings were suggested.

Źródło:

System Safety : Human - Technical Facility - Environment; 2019, 1, 1; 632-638
2657-5450

Pojawia się w:

System Safety : Human - Technical Facility - Environment

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 38.

Tytuł:

Influence of dry grinding on physicochemical and surface properties of talc

Autorzy:

Arsoy, Z.
Ersoy, B.
Evcin, A.
Icduygu, M. G.

Powiązania:

https://bibliotekanauki.pl/articles/109327.pdf

Data publikacji:

2017

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

talc
grinding
contact angle
surface free energy
oil absorption
whiteness

Opis:

In this study the effect of dry grinding on hydrophobicity, surface free energy (SFE), particle size distribution, surface area, porosity, oil absorption, and whiteness of talc was investigated. The dry grinding was performed in a vibrating ball mill at various grinding times (5-150 min) by keeping the grinding parameters constant such as the number of ball, ball size, the amount of talc, vibration frequency and amplitude. Then, the contact angle measurements were performed on disc-shaped samples produced under a hydraulic press by using a sessile drop method with different liquids (water, formamide, diiodomethane, and ethylene glycol), and surface free energies (mJ/m2) were calculated according to OCG-AB (van Oss-Chaudhury-Good Acid-Base) method by using the obtained contact angle values. In addition, the physicochemical analyses given above were carried out for each ground sample. According to the obtained results, the water contact angle and SFE of the original sample were 63.800 and 48.70 mJ/m2, respectively. The lowest and highest contact angle values for the samples were obtained as 59.300 and 70.770 at grinding times for 5 and 15 min, respectively. It was also determined that the grinding time over 30 min showed no significant effect on the contact angle and SFE values of the samples. Similarly, the grinding time vs. SFE, and the grinding time vs. contact angle curves showed a similar trend. Parallel to the increase in the surface area upon the grinding, a small increase in the oil absorption and whiteness of talc was also determined.

Źródło:

Physicochemical Problems of Mineral Processing; 2017, 53, 1; 288-306
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 39.

Tytuł:

Wetting processes in supported ionic liquid membranes technology

Autorzy:

Cichowska-Kopczynska, I.
Joskowska, M.
Aranowski, R.

Powiązania:

https://bibliotekanauki.pl/articles/110341.pdf

Data publikacji:

2014

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

ionic liquid
supported ionic liquid membrane
contact angle
wettability
swelling

Opis:

Ionic liquids are widely used in supported ionic liquid membranes technology, especially in gas separation and purification processes. This work characterizes the ability of ionic liquids to wet commercially available porous supports used for such purposes. Characterization of supports and membrane phases was carried out in order to determine factors influencing wetting process. Experimental method based on capillary rise is widely used for porous media characterization (i.e. pore radius, contact angle). Measurements of penetration distance or liquid mass are two main experimental methods, in which the Washburn equation is a basic instrument to analyze the obtained results. However, polymeric porous supports do not meet Washburn assumptions and the method is loaded with human errors, so the sessile drop method was used. The rate of wetting influences swelling effects and therefore changes in permeation path during gas separation processes are observed. Influence of ionic liquids structure on wetting and swelling of porous supports was investigated. The families of 1-alkyl-3-methylimidazolium (Cnmim), ammonium (Nnnnn), 1-alkyl-1-methylpyrrolidinium (CnPyrr) and 1-alkylpyridinium (CnPy) compounds with variable alkyl chain lengths in cation structures and changeable anions were taken into account in wetting and swelling experiments.

Źródło:

Physicochemical Problems of Mineral Processing; 2014, 50, 1; 373-386
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 40.

Tytuł:

Surface properties of chitosan acetate, polyacrylamide and their mixtures

Autorzy:

Lewandowska, Katarzyna

Powiązania:

https://bibliotekanauki.pl/articles/1035217.pdf

Data publikacji:

2013

Wydawca:

Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe

Tematy:

AFM
chitosan acetate
contact angle
polyacrylamide
polymer blends
surface properties

Opis:

The surface properties of chitosan acetate (ChA), polyacrylamide (PAM) and ChA/PAM mixtures have been investigated by the tapping-mode atomic force microscopy (AFM) and monitored by contact angle measurements. Chitosan is blended with polyacrylamide in acetic acid solution and this solution is cast to prepare the mixture film. Measurements of the contact angle for two different liquids (diiodomethane and glycerol) on the surface of chitosan acetate. The surface free energy (γs) as well as dispersive (gsd) and polar (gsp) components were calculated from contact angle values by Owens-Wendt methods using an appropriate computer program. The values of polar and dispersive components of surface free energy show that PAM films are more polar than chitosan acetate films. In the case of ChA/PAM mixtures, the values of surface free energy and polar component are reduced significantly compared with pure polymers. This behavior indicates rather hydrophobic character of this surface. The changes of topography images were considered by determining the root mean square (RMS) deviation in the image data. The study of blends by AFM showed a completely different morphology when compared with pure components. The roughness of blends increases with the increase of ChA content. This may indicates a strong interaction between the polymeric components.

Źródło:

Progress on Chemistry and Application of Chitin and its Derivatives; 2013, 18, 18; 29-34
1896-5644

Pojawia się w:

Progress on Chemistry and Application of Chitin and its Derivatives

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 41.

Tytuł:

Do combinations of insecticides and acaricides influence spray droplet formation and the interaction with citrus leaves?

Autorzy:

Della Vechia, J.F.
Santos, R.T.
Griesang, F.
Santos, C.M.
Ferriera, M.C.
Andrade, D.J.

Powiązania:

https://bibliotekanauki.pl/articles/2084816.pdf

Data publikacji:

2019

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

contact angle
coverage efficiency
droplet size
surface tension
tank mixture

Opis:

In agriculture, the mixing of pesticides in tanks is a common practice. However, it is necessary to previse possible physical-chemical implications of this practice, which may affect the efficiency of the treatments performed. Therefore, the objective of this study was to evaluate the effects of the addition of acaricide to insecticidal spray mixtures on the formation of spray droplets and the interaction with citrus leaves. The experimental design was totally randomized, in a (2 × 3 + 1) factorial scheme for seven treatments. Factor A corresponded to the spray mixture used (isolate or in the mixture). Factor B corresponded to the insecticides tested (lambda-cyhalothrin + thiamethoxam, phosmet, and imidacloprid) and the control consisted of a spray mixture with spirodiclofen only. Nine replications were performed for characterization of the spray droplet size spectrum and four replications for the analysis of the surface tension and the contact angle. The mixture of pesticides showed positive results in terms of application safety. The addition of acaricide to insecticide spray mixtures reduced the surface tension and contact angle of droplets on the adaxial surface of orange leaves. There was an increment in volume median diameter (VMD), a significant reduction in the volume of droplets with drift-sensitive size and improvement in the uniformity of droplet size. Therefore, the addition of acaricide to an insecticide spray mixture positively influenced spray droplet formation and the interaction with citrus leaves providing better coverage and droplet size fractions with an appropriate size for safe and efficient application.

Źródło:

Journal of Plant Protection Research; 2019, 59, 4; 487-493
1427-4345

Pojawia się w:

Journal of Plant Protection Research

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 42.

Tytuł:

Components and parameters of synthetic chalcocite surface tension and its wettability by aqueous solution of n-octyl-β-D-glucopyranoside

Autorzy:

Jańczuk, B.
Zdziennicka, A.

Powiązania:

https://bibliotekanauki.pl/articles/110743.pdf

Data publikacji:

2018

Wydawca:

Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej

Tematy:

contact angle
wettability
surface tension
chalcocite
n-octyl-β-D-glucopyranoside

Opis:

The measurements of advancing contact angle of water, glycerol, formamide, ethylene glycol, diiodomethane, α-bromonaphthalene, 1,2,3-tribromopropane and aqueous solution of n-octyl-β-D-glucopyranoside (OGP) on unoxidized and oxidized synthetic chalcocite at the temperatures equal to 293, 303 and 313 K were made. Using the obtained contact angle values of the pure liquids the components and parameters of the unoxidized and oxidized synthetic chalcocite surface tension were calculated. For this calculation, different methods based on the Young equation were applied. It follows that the surface tension of both forms of chalcocite does not practically depend on the temperature in the range from 293 to 313 K. Taking into account the calculated values of components and parameters of unoxidized and oxidized chalcocite surface tension their wettability by the aqueous solution of n-octyl-β-D-glucopyranoside was considered. It appeared that wettability of the unoxidized chalcocite by aqueous solution of OGP can be predicted on the basis of the chalcocite surface tension components and parameters.

Źródło:

Physicochemical Problems of Mineral Processing; 2018, 54, 1; 19-30
1643-1049
2084-4735

Pojawia się w:

Physicochemical Problems of Mineral Processing

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 43.

Tytuł:

Porównanie metod oznaczania statycznego kąta zwilżania powierzchni cieczą małocząsteczkową
Comparison between values of sessile drop contact angle depending on method of determination

Autorzy:

Bieliński, D.
Lipiński, P.
Wolska, B.
Jagielski, J.

Powiązania:

https://bibliotekanauki.pl/articles/257952.pdf

Data publikacji:

2006

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Technologii Eksploatacji - Państwowy Instytut Badawczy

Tematy:

powierzchnia
kąt zwilżania
aparatura
pomiar
surface
microroughness
polarity
contact angle
instrument

Opis:

Powierzchnię próbek polietylenów: wysokiej gęstości (PE-HD) oraz o bardzo wysokim ciężarze cząsteczkowym (PE-UHMW), poddano bombardowaniu niskoenergetyczną wiązką jonów, uzyskując powierzchnię o zróżnicowanej polarności i mikrochropowatości. Badano kąt zwilżania powierzchni materiałów wodą metodą osadzanej kropli za pomocą różnej aparatury, wykorzystując różne sposoby jego odczytu. Porównano uzyskane wyniki oraz zaprezentowano interpretację powodów rozbieżności w wielkości kąta zwilżania. W analizie wzięto pod uwagę jakość badanej powierzchni - przede wszystkim jej mikrochropowatość, czynniki instrumentalne: objętość kropli i szybkość jej osadzania oraz dokładność, z jaką można wyznaczyć zarys kropli i poziom jej zetknięcia się z badaną powierzchnią.
Surface of polyethylenes: high density (HDPE) and ultrahigh molecular weight (UHMWPE), was subjected to low energy ion beam, producing surfaces of various polarity and microroughness. Sessile drop water contact angle for materials was determined with various instruments, applying different methodology. The results obtained were compared and possible reasons for discrepancies in values of the contact angles, interpreted. The analysis took into consideration quality of the surface studied - mainly its microroughness, instrumentation factors: volume of droplet and speed of its application, as well as precision of a shape of droplet boarder determination and level of its contact with the surface studied.

Źródło:

Problemy Eksploatacji; 2006, 1; 131-144
1232-9312

Pojawia się w:

Problemy Eksploatacji

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 44.

Tytuł:

Selected physical and mechanical properties of high-density wet formed fibreboards produced with different cement content

Autorzy:

Filipiak, Weronika
Kowaluk, Grzegorz

Powiązania:

https://bibliotekanauki.pl/articles/2206679.pdf

Data publikacji:

2019

Wydawca:

Szkoła Główna Gospodarstwa Wiejskiego w Warszawie. Wydawnictwo Szkoły Głównej Gospodarstwa Wiejskiego w Warszawie

Tematy:

hardboard
cement
water absorption
density profile
contact angle
wet formed fibreboard

Opis:

Selected physical and mechanical properties of high-density wet formed fibreboards produced with different cement content. The aim of this work was to produce, in laboratory conditions, high-density wet formed fibreboards with a different cement binder content: 0%; 0.5%; 1%; 2%; 5%; 10%. The panels were tested for their physical and mechanical properties in order to determine the effect of added cement on the properties of the boards. The results show that the mechanical parameters of the tested panels grow compare to the reference panel when the mass share of cement is 0.5%, and decreases with the cement share increase to 10%. The remaining physical parameters of the tested panels get worse with the cement content increase.
Wybrane właściwości fizyczne i mechaniczne płyt pilśniowych mokroformowanych wysokiej gęstości wytworzonych z różnym udziałem cementu. Celem pracy było wytworzenie w warunkach laboratoryjnych płyt pilśniowych mokroformowanych o wysokiej gęstości, z różnym udziałem spoiwa cementowego: 0%; 0.5%; 1%; 2%; 5%; 10%. Wytworzone płyty zostały zbadane pod kątem ich wybranych właściwości fizycznych oraz mechanicznych, w celu ustalenia wpływu dodatku cementu na właściwości płyt. Badania wykazały, że parametry mechaniczne płyt w stosunku do płyt referencyjnych, gdy udział cementu wynosi 0,5%, a spadają wraz ze wzrostem udziału cementu do 10%. Pozostałe parametry fizyczne badanych płyt pogarszają się wraz ze wzrostem udziału cementu.

Źródło:

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology; 2019, 106; 77--84
1898-5912

Pojawia się w:

Annals of Warsaw University of Life Sciences - SGGW. Forestry and Wood Technology

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 45.

Tytuł:

The effect of chemical structure of foundry binder diluent on surface processes and sand strength
Wpływ chemicznej struktury rozcieńczalnika w spoiwie na przebieg procesów powierzchniowych i na wytrzymałość masy

Autorzy:

Hutera, B.
Drożyński, D.

Powiązania:

https://bibliotekanauki.pl/articles/354126.pdf

Data publikacji:

2011

Wydawca:

Polska Akademia Nauk. Czytelnia Czasopism PAN

Tematy:

dynamika zwilżania
rozcieńczalnik
wytrzymałość masy
dynamic contact angle
diluent
moulding sands

Opis:

The paper presents the results of investigations of the dynamics of wetting in a quartz-binder system. It has been proved that the two-stage process of wetting (unsteady state passing into the steady state) is important for the practice of moulding sands and depends on physico-chemical parameters of binder, especially on its viscosity. A mathematical description of the wetting phenomena was given and it was demonstrated that the course of the wetting dynamics is determined by the viscosity which depends on the chemical structure and concentration of added diluent. The wetting dynamics is characterised by the difference ?? between the values of the initial ?0 and equilibrium ?r contact angle and by the time ?r that the system needs to reach a steady state. It has been shown that the dynamics of quartz wetting by the binder with diluent of a chain structure and high concentration is higher with simultaneous reducing of time ?r. It has been verified that the resistance of moulding sands with binder and the diluent of chain structure and high concentration is higher compared to the strength of the sands with diluent of another structure.
W pracy przedstawiono wyniki badań dynamiki zwilżania w układzie: kwarc-spoiwo. Wykazano, że dwuetapowy proces zwilżania (stan niestacjonarny przechodzący w stan stacjonarny) ma znaczenie dla praktyki mas i uwarunkowany jest parametrami fizykochemicznymi spoiwa a zwłaszcza jego lepkością. Przedstawiono matematyczny opis zjawiska zwilżania oraz wykazano, że na przebieg dynamiki zwilżania ma lepkość uwarunkowana chemiczną strukturą i stężeniem wprowadzonego rozcieńczalnika. Dynamikę zwilżania charakteryzuje różnica ?? pomiędzy wartościami początkowego ?0 i równowagowego ?r kąta zwilżania oraz czas ?r dojścia układu do stanu stacjonarnego. Wykazano, że dynamika zwilżania kwarcu przez spoiwa z rozcieńczalnikiem o strukturze łańcuchowej i wysokim stężeniu jest wyższa przy równoczesnym skróceniu czasu ?r. Zweryfikowano, że wytrzymałość mas ze spoiwem z rozcieńczalnikiem o strukturze łańcuchowej i wysokim stężeniu jest wyższa w porównaniu z wytrzymałością mas z rozcieńczalnikiem o innej strukturze.

Źródło:

Archives of Metallurgy and Materials; 2011, 56, 1; 31-36
1733-3490

Pojawia się w:

Archives of Metallurgy and Materials

Dostawca treści:

Biblioteka Nauki

/5

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Skocz do pozycji: 46.

Tytuł:

Elastomery silikonowe o zwiększonej hydrofobowości uzyskiwane z trawionych matryc krzemowych i duralowych
Silicone elastomers with improved hydrophobicity obtained from etched silicon and duralumin templates

Autorzy:

Żyłka, P.

Powiązania:

https://bibliotekanauki.pl/articles/158802.pdf

Data publikacji:

2012

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Elektrotechniki

Tematy:

superhydrofobowość
kąt zwilżania
kauczuk silikonowy
replika
hydrophobicity
contact angle
silicone rubber
replica

Opis:

Hydrofobowość elastomerowych gum silikonowych zależy w silny sposób m.in. od mikrostruktury ich powierzchni. W artykule przedstawiono wyniki prac doświadczalnych zmierzających do uzyskania kauczuku silikonowego o właściwościach superhydrofobowych. W tym celu zastosowano metodę repliki bezpośredniej przy czym jako matrycę negatywową wykorzystano mikrotrawione anizotropowo podłoże krzemowe lub podłoże duralowe trawione elektroerozyjnie. Uzyskane próbki kauczuku silikonowego scharakteryzowano zarówno pod względem mikrotopografii powierzchni jak i jej chropowatości a także statycznego kąta zwilżania i kąta spływu kropli wody.
Hydrophobicity of elastomeric silicone rubber depends strongly on its surface properties. The paper presents results of experimental works aimed at obtaining silicone rubber displaying superhydrophobic effect. Direct replica method was used for sample manufacturing while anisotropic etched silicon as well as electrodischarge machined duralumin substrates were employed as negative templates. Surface microtopography, its roughness as well as water static contact angle and run-off angle were characterized for obtained silicone rubber specimens.

Źródło:

Prace Instytutu Elektrotechniki; 2012, 259; 25-26
0032-6216

Pojawia się w:

Prace Instytutu Elektrotechniki

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 47.

Tytuł:

Wetting hysteresis test of solids by different types of surfactants
Badanie histerezy zwilżania materiałów stałych surfaktantami różnych typów

Autorzy:

Sala, D.
Mizerski, A.

Powiązania:

https://bibliotekanauki.pl/articles/137034.pdf

Data publikacji:

2013

Wydawca:

Szkoła Główna Służby Pożarniczej

Tematy:

wetting
hysteresis
surface tension
contact angle
zwilżanie
histereza
napięcie powierzchniowe
kąt graniczny

Opis:

The results of the studies of the wetting hysteresis of solids by surfactant solutions were presented. Using the K100MK2 tensiometer surface tension isotherms of tested surfactants were specified . On their basis the critical micelle concentration (CMC) of each surfactant was determined. Wetting properties were tested at concentrations of 0.5 CMC, 1 CMC, 2 CMC. The following five solid materials were used for the measurements: polyethylene, poly(methyl methacrylate), polytetrafluoroethylene, copper and glass. Differences among the wetting properties of surfactants on tested solid materials were discussed and the results were compared with the literature data.
W artykule przedstawiono wyniki badań histerezy zwilżania materiałów stałych roztworami surfaktantów różnych typów. Za pomocą tensjometru K100 MK2 wyznaczono izotermy napięcia powierzchniowego badanych surfaktantów i na podstawie ich przebiegu określono wartości krytycznego stężenia micelizacji (CMC) każdego surfaktantu. Zdolności zwilżające badano przy stężeniach roztworów równych 0.5, 1 i 2 CMC. Do pomiarów wykorzystano 5 materiałów stałych: polietylen, polimetakrylan metylu, teflon, miedź i szkło. Omówiono różnice zdolności zwilżających użytych surfaktantów w stosunku do badanych materiałów stałych i porównano otrzymane wyniki z danymi literaturowymi.

Źródło:

Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej; 2013, 4, 48; 7-21
0239-5223

Pojawia się w:

Zeszyty Naukowe SGSP / Szkoła Główna Służby Pożarniczej

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 48.

Tytuł:

Hydrofobowe pokrycia organiczne na gładkich podłożach i na podłożach z rozwiniętą powierzchnią
Hydrophobic organic layers on smooth and 3-dimensional developed surfaces

Autorzy:

Stańczyk, B.
Dobrzański, L.
Góra, K.
Jach, K.
Jagoda, A.

Powiązania:

https://bibliotekanauki.pl/articles/192244.pdf

Data publikacji:

2015

Wydawca:

Sieć Badawcza Łukasiewicz - Instytut Technologii Materiałów Elektronicznych

Tematy:

powierzchnia hydrofobowa
kąt zwilżania
PMMA
PVDF
OTS
hydrophobic surface
wetting
contact angle

Opis:

W artykule scharakteryzowano własności hydrofobowe warstw organicznych uzyskanych na powierzchniach gładkich i z celowo rozwiniętą powierzchnią, której geometria była przedmiotem badań. Przebadano własności żywic takich jak: polifluorowinyliden, polimetakrylan metylu, octatrichlorosilan. Przedstawiono cechy tych materiałów w zależności od rodzaju nośnika, sposobu przygotowania roztworu roboczego oraz metody osadzania na różnych powierzchniach. Własności hydrofobowe otrzymanych warstw weryfikowano za pomocą pomiarów kąta zwilżania (CA) statycznej kropli wody i metodą dynamiczną. Uzyskano wartości CA na poziomie od ok. 135° do 180°.
In this paper we present the hydrophobic properties of organic layers obtained on both smooth and 3D surfaces. the geometry of which has been the research topic. We have investigated polymers such us: polyvinylidene fluoride, poly (methyl methacrylate), octatrichlorosilane. The properties of these layers depending on their preparation and deposition method have been determined. We have verified the wetting contact angle by performing static and dynamic measurements. The obtained values of the wetting contact angle have been in the 135° - 180° range.

Źródło:

Materiały Elektroniczne; 2015, T. 43, nr 3, 3; 25-34
0209-0058

Pojawia się w:

Materiały Elektroniczne

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 49.

Tytuł:

Generowanie nanoporów w polimerowej warstwie zabezpieczającej powierzchnie implantów metalowych w kierunku kontrolowanego uwalniania leków
Generation of nanopores in protective polymer layer on metal implants surface for controlled drug delivery

Autorzy:

Gołda, M.
Kotarba, A.

Powiązania:

https://bibliotekanauki.pl/articles/286141.pdf

Data publikacji:

2012

Wydawca:

Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów

Tematy:

parylen C
AFM
XPS
pomiar kąta zwilżania
parylene C
contact angle measurement

Opis:

W pracy przedstawiono badania składu chemicznego i morfologii próbek parylenu C modyfikowanego przy użyciu plazmy. Do badań zastosowano pomiary kąta zwilżania, spektroskopię fotoelektronów wzbudzonych promieniowaniem rentgenowskim (XPS) oraz mikroskopię sił atomowych (AFM). Stwierdzono wpływ oddziaływania plazmy na skład chemiczny i morfologię powierzchni badanych próbek.
The paper reports a investigation on chemical composition and morphology of parylene C samples modified via plasma treatment. Various analytical methods, such as contact angles measurements, X-ray Photoelectron Spectroscopy (XPS) and atomic force microscope (AFM) were used. A significant effect of plasma treatment on chemical composition and polymer surface morphology was found.

Źródło:

Engineering of Biomaterials; 2012, 15, no. 116-117 spec. iss.; 19-21
1429-7248

Pojawia się w:

Engineering of Biomaterials

Dostawca treści:

Biblioteka Nauki

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Skocz do pozycji: 50.

Tytuł:

Modification of Concrete Surface with Higher Fatty Acids

Autorzy:

Barnat-Hunek, Danuta
Andrzejuk, Wojciech
Szafraniec, Małgorzata
Kachel, Magdalena
Hunek, Robert

Powiązania:

https://bibliotekanauki.pl/articles/2201909.pdf

Data publikacji:

2023

Wydawca:

Stowarzyszenie Inżynierów i Techników Mechaników Polskich

Tematy:

contact angle
higher fatty acid
hydrophobic agent
hydrophobization
water tightness
vapor permeability

Opis:

The research presented in the paper concerns the production of innovative hydrophobizing agents and demonstration their effectiveness on a concrete surface. The starting materials are based on natural oils, water‒soluble silanes and siloxanes, and/or tap water. Aqueous preparations are characterized by properties which reduce the impact of volatile organic compounds (VOCs) on the environment, as they consist only of biodegradable components. Studies have shown that the higher fatty acids from vegetable oils and derived from the glycerin phase can be used as a component of concrete hydrophobizing agents, meeting the standard requirements for such agents. Analysis of the use of vegetable oil as a base compound for the production of industrial agents provides at least 95% confidence in its biodegradability. The reference concrete after the frost resistance test showed a weight loss of 1.8%. In the case of hydrophobization, the weight loss was 33.3 to 72% less than the reference samples. In the case of concrete hydrophobized with the glycerin agents, the salt crystallization occurred inside the structure of the material without causing any damage, with the reference concrete showing a weight loss of 0.8%.

Źródło:

Advances in Science and Technology. Research Journal; 2023, 17, 2; 307--321
2299-8624

Pojawia się w:

Advances in Science and Technology. Research Journal

Dostawca treści:

Biblioteka Nauki

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