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Wyszukujesz frazę "surface tension" wg kryterium: Temat


Wyświetlanie 1-10 z 10
Tytuł:
Zależność między granicznym kątem zwilżania a średnim napięciem powierzchniowym zwilżania węgli o różnym stopniu zmetamorfizowania
The relationship between contact angle and mean critical surface tension of coals of different rank
Autorzy:
Sablik, J.
Powiązania:
https://bibliotekanauki.pl/articles/318608.pdf
Data publikacji:
2003
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
graniczny kąt zwilżania
węgiel
napięcie powierzchniowe zwilżania
surface tension of wetting
contact angle
critical surface tension
coal
Opis:
Badano empiryczne zależności między granicznym kątem zwilżania powierzchni węgla θ a średnim napięciem powierzchniowym zwilżania γc. Aby uzyskać odpowiednie dane badano 20 próbek węgli kamiennych o różnym stopniu zmetamorfizowania. Stwierdzono zależność funkcyjną między badanymi parametrami, którą ilościowo opisano równaniem regresji. Wykorzystując wartości γc niejednorodności energetycznej w zbiorze ziaren σγc badanych węgli oraz wyżej wymienione równanie określono przedziały wartości, w których mogą się mieścić graniczne kąty zwilżania w zbiorze ziaren danego węgla. Wyznaczono także wartość napięcia powierzchniowego zwilżania γc(θ = 0), powyżej której kąt zwilżania powierzchni węgla wynosi zero. Dla badanych węgli wartość ta wynosi 57,838 mJ/m2. Wykorzystując krzywe rozkładu energii powierzchniowej w zbiorze ziaren, określono udział w danym zbiorze ziaren o kącie zwilżania równym zero.
Empirical relationships between the contact angle of coal surface θ and the mean critical surface tension of wetting γc were investigated. In order to obtain suitable data, 20 hard coal samples of different rank were tested. The functional relationship between investigated parameters was stated, described quantitatively by means of a regression equation. Using the γc. and energetic nonhomogeneity values in the set of particles σγc of tested coals as well as the above mentioned equation, the intervals of values were determined, in which the contact angles in the set of grains of the given coal can be contained. Moreover, the value of surface tension of wetting γc(θ = 0), above which the contact angle of coal surface is equal to zero, was calculated. For tested coals this value amounts to 57.838 mJ/m2. Using curves of surface energy distribution in the set of particles, the share of particles with contact angle equal to zero in the given set was determined.
Źródło:
Inżynieria Mineralna; 2003, R. 4, nr 2, 2; 3-10
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
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
Artykuł
Tytuł:
Wettability and Surface Free Energy of Ti(C,N) Coatings on Nickel-based Casting Prosthetic Alloys
Autorzy:
Banaszek, K.
Klimek, L.
Powiązania:
https://bibliotekanauki.pl/articles/381148.pdf
Data publikacji:
2015
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
dental alloy
wettability
contact angle
surface tension
surface free energy
stop dentystyczny
zwilżalność
kąt zwilżania
napięcie powierzchniowe
energia powierzchniowa swobodna
Opis:
The production process of prosthetic restorations runs in two stages. In the first stage, the prosthetic foundation is produced of metal alloys. In the second stage, a facing material is applied on the produced element. In both stages, the wettability is significantly important, as well as the free surface energy relating to it. The quality of the obtained cast depends on the surface phenomena occurring between the metal alloy and the material of which the casting mould is made. The performed examinations also point to a relation between the ceramics joint and the base, depending on the wetting angle. The aim of the presented paper was to examine influence of the composition of a Ti(C,N)-type coating on bases made of the Ni-Cr prosthetic alloy on the wettability and the surface free energy. The test material were disks made of the Ni-Cr alloy with the diameter of 8 mm. The disks were divided into five groups, which were covered with Ti(C,N) coatings, with different amounts of C and N in the layer. In order to determine the surface free energy (γs), the wetting angle was measured. Two measure liquids were applied: distilled water and diiodomethane. The obtained results of the measurements of the water-wetting angles suggest that together with the increase of the ratio of nitrogen to carbon in the Ti(C,N) coating, the surface hydrophobicity increases as well. In all the samples, one can see a large difference between the energy values of the polar and the apolar components. The high values of the polar components and the low values of the apolar ones make it possible to conclude that these surfaces exhibit a greater affinity to the polar groups than to the apolar ones. On the basis of the analysis of the surface free energy, one can state that covering the alloy with Ti(C,N)-type coatings should not decrease the adhesion of the ceramics to the alloy, whereas TiC coatings should lead to the latter’s improvement. Due to their hydrophilicity, TiC coatings should decrease the adhesion of bacteria to the surface and hinder the formation of a bacterial biofilm.
Źródło:
Archives of Foundry Engineering; 2015, 15, 3; 11-16
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface Tension of Cu – Bi Alloys And Wettability in a Liquid Alloy – Refractory Material – Gaseous Phase System
Napięcie powierzchniowe stopów Cu – Bi oraz zwilżalność w układzie: ciekły stop – materiał ogniotrwały – faza gazowa
Autorzy:
Oleksiak, B.
Łabaj, J.
Wieczorek, J.
Blacha-Grzechnik, A.
Burdzik, R.
Powiązania:
https://bibliotekanauki.pl/articles/354400.pdf
Data publikacji:
2014
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
surface tension
contact angle
wettability
sessile drop method
high-temperature microscope
liquid Cu-Bi alloys
napięcie powierzchniowe
zwilżalność
metoda kropli leżącej
mikroskop wysokotemperaturowy
ciekłe stopy Cu-Bi
Opis:
The study involved measurements of surface tension of liquid binary copper-bismuth alloys with respect to their chemical composition and temperature as well as investigations of the liquid alloy - refractory material - gaseous phase system wettability using usual refractory materials, i.e. aluminium oxide, magnesium oxide and graphite. The experiments were performed with the use of sessile drop method and a high-temperature microscope coupled with a camera and a computer was utilised.
W ramach pracy przeprowadzone zostały pomiary napięcia powierzchniowego ciekłych dwuskładnikowych stopów miedzi z bizmutem, w funkcji składu chemicznego i temperatury oraz badania zwilżalności w układzie: ciekły stop- materiał ogniotrwały-faza gazowa z wykorzystaniem typowych materiałów ogniotrwałych, to jest tlenku glinu, tlenku magnezu oraz grafitu. Badania wykonano metodą kropli leżącej, przy użyciu mikroskopu wysokotemperaturowego sprzężonego z kamerą i komputerem.
Źródło:
Archives of Metallurgy and Materials; 2014, 59, 1; 281-285
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-10 z 10

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