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Wyświetlanie 1-15 z 129
Tytuł:
Cold Plasma Surface Modification of PLA and LDPE Polymer Plastics
Autorzy:
Leluk, Karol
Powiązania:
https://bibliotekanauki.pl/articles/27322946.pdf
Data publikacji:
2023
Wydawca:
Politechnika Koszalińska. Wydawnictwo Uczelniane
Tematy:
packaging plastic
plasma modification
wetting
surface properties
Opis:
Low-density polyethylene (LDPE) and polylactic acid (PLA) plastic films were subjected to modification using different plasma sources. Argon, nitrogen, air and oxygen were used as a gas phase throughout the process, and their impact on the material's surface properties was verified. The surface activation rate was measured via atomic force microscopy regarding the porosity factor and using the water contact angle technique. The last method – being feasible, agile and of high sensitivity to alternating physicochemical surface character – was utilised to verify the post-process stability of the modified surface. Those tests were performed extensively, up to 160 hours (contact angle) and 240 hours (atomic force microscopy).
Źródło:
Rocznik Ochrona Środowiska; 2023, 25; 141--147
1506-218X
Pojawia się w:
Rocznik Ochrona Środowiska
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Photocatalytic properties of transparent TiO2 coatings doped with neodymium
Autorzy:
Wojcieszak, D.
Kaczmarek, D.
Domaradzki, J.
Mazur, M.
Morawski, A. W.
Janus, M.
Prociów, E.
Gemmellaro, P.
Powiązania:
https://bibliotekanauki.pl/articles/779161.pdf
Data publikacji:
2012
Wydawca:
Zachodniopomorski Uniwersytet Technologiczny w Szczecinie. Wydawnictwo Uczelniane ZUT w Szczecinie
Tematy:
TiO2
neodymium
photocatalysis
wettability
surface properties
Opis:
In this work photocatalytic properties of TiO2 thin fi lms doped with 8.51 at. % of Nd were described. The self-cleaning phenomenon of thin fi lms was discussed together with the structural, optical and surface properties of prepared thin fi lms. Transparent coatings based on titanium dioxide were manufactured by high-energy reactive magnetron sputtering process. Incorporation of Nd during sputtering process results in amorphous behavior, without a signifi cant infl uence on transparency and colour as compared to the undoped TiO2-rutile matrix. Nevertheless, doping with neodymium doubles the photocatalytic activity of the matrix due to higher quantity of photo-generated charge carriers and more effi cient mechanism of energy transfer.
Źródło:
Polish Journal of Chemical Technology; 2012, 14, 3; 1-7
1509-8117
1899-4741
Pojawia się w:
Polish Journal of Chemical Technology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisation of chitosan/hyaluronic acid blend films modified by collagen
Autorzy:
Lewandowska, Katarzyna
Sionkowska, Alina
Grabska, Sylwia
Michalska, Marta
Powiązania:
https://bibliotekanauki.pl/articles/1034575.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitosan
collagen
hyaluronic acid
polymer blends
surface properties
Opis:
In the present study, thin films based on the blends of chitosan (Ch) and hyaluronic acid (HA) with and without collagen (Coll) were characterised using tensile tests, attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR) and thermogravimetric analysis (TGA). Ch/HA and Ch/HA/Coll polymer blends were prepared using the solvent evaporation technique. The interactions between polymer components in the binary and ternary blends were studied by FTIR analysis. Mechanical properties were studied and compared with those of simple polymer films. These results show that the addition of collagen into Ch/HA blends led to the increase of tensile strength and Young modulus. Moreover, it was found that the thermal stability of the Ch/HA binary blend significantly increased upon the addition of collagen.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2017, 22; 125-134
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Characterisation of thin chitosan films for guided tissue regeneration purposes
Autorzy:
Lewandowska, Katarzyna
Furtos, Gabriel
Powiązania:
https://bibliotekanauki.pl/articles/1034614.pdf
Data publikacji:
2017
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
SBF soaking
chitosan
composites
microscopy
montmorillonite
surface properties
Opis:
The morphology and structure of thin films containing chitosan (Ch) with montmorillonite (MMT) were characterised by scanning electron microscopy (SEM), atomic force microscopy (AFM) and attenuated total reflectance Fourier transform infrared spectroscopy (ATR-FTIR). Thin films of two chitosan samples and a composition of chitosan with montmorillonite were formed by casting methods from acetic acid solutions and were soaked in a simulated body fluid (SBF) solution at 37C for 14 days. The samples were compared before and after soaking. The obtained results showed growth of new phases containing calcium in all prepared films.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2017, 22; 118-124
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of the type solvent on the structure of chitosan blends with hyaluronic acid
Autorzy:
Lewandowska, Katarzyna
Sionkowska, Alina
Grabska, Sylwia
Powiązania:
https://bibliotekanauki.pl/articles/1034698.pdf
Data publikacji:
2016
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
chitosan
hyaluronic acid
microscopy.
polymer blends
surface properties
Opis:
The influence of the type solvent on the structure of chitosan, hyaluronic acid and their blend films was investigated. Aqueous acetic acid, hydrochloric acid, sodium chloride and aqueous acetic acid/NaCl were used as solvents for chitosan, hyaluronic acid and Ch/HA solution blends. Ch, HA and their blend films were prepared by casting technique. The homogeneity and morphology of chitosan blends were ascertained from the tapping-mode atomic force microscopy (AFM) and scanning electron microscopy (SEM). The changes of topography images are considered by determining the root mean square (RMS, Rq) deviation in the image data. The surface roughness of chitosan, hyaluronic acid and Ch/HA blended films was altered by mixing. The structure of chitosan blends with hyaluronic acid depends on the blend composition and on the solvent used for preparing the blend.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2016, 21; 147-153
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Miscibility and interactions in chitosan and polyacrylamide mixtures
Autorzy:
Lewandowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1035186.pdf
Data publikacji:
2014
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
AFM
FTIR analysis
chitosan
polyacrylamide
polymer blends
surface properties
Opis:
In the present work, the results of Fourier transform infrared (FTIR) and atomic force microscopy (AFM) studies of films of chitosan acetate (ChA), polyacrylamide (PAM), and their mixtures are presented. The morphology of the ChA and PAM films and their mixtures was studied by tappingmode atomic force microscopy (AFM). The topography images were considered by determining the root mean square (RMS) deviation in the image data. The study of mixtures by AFM showed a completely different morphology when compared with pure components. The roughness of mixtures increases with the increase of ChA content but is significantly reduced after UV exposure. This may indicate a strong interaction between the polymeric components. The FTIR spectroscopy also supports the obtained results. The miscibility of polymer mixtures is related to interactions between the functional groups of the polymeric components.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2014, 19; 65-71
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface properties of chitosan composites with poly(vinyl alcohol) and hydroxyapatite
Autorzy:
Lewandowska, Katarzyna
Powiązania:
https://bibliotekanauki.pl/articles/1035048.pdf
Data publikacji:
2015
Wydawca:
Sieć Badawcza Łukasiewicz - Polskie Towarzystwo Chitynowe
Tematy:
AFM
chitosan
composites
hydroxyapatite
poly(vinyl alcohol)
surface properties
Opis:
Surface properties of composites containing chitosan (Ch), poly(vinyl alcohol) (PVA) with hydroxyapatite (HAP) were investigated by contact angle measurements and atomic force microscopy (AFM). Thin films of Ch/HAP and Ch/PVA/HAP composites have been formed by casting methods from acetic acid solutions. Measurements of the contact angle for diiodomethane (D), and glycerol (G) on the surface of chitosan films, Ch/HAP and chitosan/PVA/HAP films were made and surface free energy was calculated. It was found that chitosan/HAP or Ch/PVA/HAP blend surface is enriched in high surface energy component i.e. chitosan. The study of composites by AFM showed a completely different morphology when compared with unmodified components. The roughness of composites increase after the addition of hydroxyapatite. This may indicates a strong interaction between the polymeric components and inorganic additive.
Źródło:
Progress on Chemistry and Application of Chitin and its Derivatives; 2015, 20; 177-182
1896-5644
Pojawia się w:
Progress on Chemistry and Application of Chitin and its Derivatives
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ nanocząstek na właściwości fizykochemiczne powierzchni materiału
Influence of nanoparticles on physical and chemical surface material properties
Autorzy:
Sołtysiak, E.
Błażewicz, M.
Powiązania:
https://bibliotekanauki.pl/articles/283819.pdf
Data publikacji:
2010
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
nanokompozyty polimerowe
nanocząstki
właściwości powierzchni
polymer nanocomposites
nanoparticles
surface properties
Opis:
Topografia i energia powierzchniowa to parametry w znaczący sposób wpływające na biozgodność materiału. Przedmiotem pracy są nanokompozyty polimerowe otrzymane w wyniku wprowadzenia do polilaktydu nanocząstek montmorylonitu (MMT). Przedstawiono wyniki badań powierzchni (SEM, AFM, EDS) oraz scharakteryzowano materiały w zakresie energii powierzchniowej i jej składowych. W pracy wykazano, że dodatek nanocząstek ceramicznych do resorbowalnej matrycy polimerowej to skuteczna droga modyfikacji parametrów powierzchni materiału, istotnych z punktu widzenia właściwości biologicznych.
Topography and surface free energy are the parameters significantly influencing biocompatibility of the material. The main objective of this work was to obtain polymer nanocomposites by the addition of nanoparticles of montmorillonite (MMT) to a polycaprolactone matrix. The results of the surface examination were presented (SEM, AFM, EDS). The material surface energy and its components were studied. In the study it was showed that the addition of ceramic nanoparticles to a resorbable polymer matrix is an effective way to modify the parameters of the material surface in terms of the biological properties.
Źródło:
Engineering of Biomaterials; 2010, 13, 92; 30-35
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
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
Artykuł
Tytuł:
Pore structure and surface properties of diatomite with mechanical grinding and its influence on humidity control
Autorzy:
Hu, Zhibo
Zheng, Shuilin
Li, Jinyu
Zhang, Shuaiqian
Liu, Min
Wang, Zhicheng
Li, Jiaxin
Sun, Hongjuan
Powiązania:
https://bibliotekanauki.pl/articles/2175445.pdf
Data publikacji:
2022
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
diatomite
mechanical grinding
pore structure
surface properties
humidity control performance
Opis:
Mechanical grinding (MG) is an effective method to regulate the pore structure and surface properties of mineral material. Grinding diatomite samples were prepared by horizontal sander under different grinding time. The pore structure and surface properties of grinding samples were characterized systematically by the particle size analysis, low temperature nitrogen adsorption, MIP, fractal theory, XRD, SEM, TEM, FTIR and surface hydroxyl density analysis. The humidity control performance (HCP) of grinding diatomite was tested under different temperature and relative humidity. The relationship among pore structure, surface properties and HCP was analyzed. The results show that macroporous is more easily damaged by mechanical force than mesoporous, and the internal blind holes structure can be opened. The HCP of diatomite is positively correlated with the specific surface area, mesoporous volume, the inhomogeneity of macroporous structure and the number of hydroxyl groups, while negatively correlated with the proportion of macroporous volume.
Źródło:
Physicochemical Problems of Mineral Processing; 2022, 58, 6; art. no. 153509
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Optical and Structural Properties of Cu2O thin Film as Active Layer in Solar Cells Prepared by DC Reactive Magnetron Sputtering
Autorzy:
Sawicka-Chudy, P.
Wisz, G.
Sibiński, M.
Cholewa, M.
Potera, P.
Głowa, Ł.
Pawełek, R.
Powiązania:
https://bibliotekanauki.pl/articles/352619.pdf
Data publikacji:
2019
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Cu2O thin films
optical properties
surface properties
compositional properties
energy band gap
Opis:
A series of copper oxide thin films were synthesized through direct current magnetron sputtering on glass and silicon substrates with various process parameters. Initially, optical microscopy images and their histograms were analyzed to determine the optical quality of the obtained layers and then histograms were created using Image Histogram Generator software. Next, the morphology, and cross-section and layer composition of the samples were evaluated. Finally, the transmission spectra of the thin films were recorded. Transmittance and reflection spectra of the UV–vis analysis were utilized to calculate the optical band gap, the extinction coefficient, and the absorption coefficient of the oxidized layers. Samples showed low transmittance (up to 40%) in the region of 400 to 1000 nm. The mean absorption coefficient varied from ~3 · 105 to ~6 · 105 1/cm and from ~2 · 105 to ~4 · 105 1/cm in the region of 2 eV to 3.5 eV. The extinction coefficient ranged from 0 to 0.11 in the region from 300 to 3000 nm. Reflectance of the samples was ~20% in the region of 1000 to 2500 nm and ranged from 20%-50% in the region of 1000 to 3000 nm. We verified the process parameters of the Cu2O structure to improve the quality as a buffer layer. On the basis of this preliminary analysis, we propose the most promising and future-oriented solutions in photovoltaic applications.
Źródło:
Archives of Metallurgy and Materials; 2019, 64, 1; 243-250
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Water contact angle on corresponding surfaces of freshly fractured fluorite, calcite and mica
Autorzy:
Kowalczuk, P. B.
Akkaya, C.
Ergun, M.
Janicki, M.
Sahbaz, O.
Drzymala, J.
Powiązania:
https://bibliotekanauki.pl/articles/110595.pdf
Data publikacji:
2017
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
contact angle
surface properties
cleaving plane
surface composition
corresponding halves
fluorite
calcite
mica
Opis:
Advancing and receding contact angles of water with corresponding surfaces of freshly fractured calcite, fluorite and mica were measured. The corresponding surfaces were obtained by mechanical splitting of a small lump of each mineral into two pieces. Theoretical considerations revealed that depending on the mineral cleaving plane, surfaces created by splitting into halves can be either identical or entirely different as far as their surface chemical composition is concerned. It was experimentally established that receding and advancing contact angles measured on the corresponding surfaces of fluorite, calcite and mica were identical for the sessile drop method. When the contact angle was measured by the captive bubble approach, there were small differences in the contact angles measured on the corresponding surfaces of fluorite. It was most probably due to surface irregularities and roughness, and therefore different times needed to rupture the liquid film between the bubble and solid surface.
Źródło:
Physicochemical Problems of Mineral Processing; 2017, 53, 1; 192-201
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
The influence of different types of carbon nanomaterial on the properties of coatings obtained by EPD process
Autorzy:
Wedel-Grzenda, A.
Tran, K.
Frączek-Szczypta, A.
Powiązania:
https://bibliotekanauki.pl/articles/284778.pdf
Data publikacji:
2016
Wydawca:
Akademia Górniczo-Hutnicza im. Stanisława Staszica w Krakowie. Polskie Towarzystwo Biominerałów
Tematy:
graphene oxide
multi-walled carbon nanotubes
electrophoretic deposition
hybrid coatings
surface properties
microstructure
Opis:
The first part of research is concentrated on the examination of four kinds of carbon nanomaterials: graphene oxide (GO), multi-walled carbon nanotubes (MWCNT), multi-walled carbon nanotubes functionalized by authors in acids mixture (MWCNT-F) and multi-walled carbon nanotubes with hydroxyl groups (MWCNT-OH). Their microstructure was observed in transmission electron microscopy (TEM). Based on these microphotographs, the diameters of carbon nanotubes were measured. Then, in order to determine the chemical composition of GO, MWCNT-F and MWCNT-OH, X-ray photoelectron spectroscopy was applied. The second part of study concerns the properties of the coatings deposited electrophoretically on titanium surface from previously examined nanomaterials. The coatings from individual nanomaterials, as well as hybrid layers (combination of two kinds of nanomaterial: graphene oxide with one of the nanotubes’ type) were deposited. Microstructure of the coatings was evaluated with the use of scanning electron microscopy (SEM). Furthermore, surface properties, important while considering usage of these materials in biological applications: wettability and surface free energy were evaluated. These materials are meant for application in regeneration and stimulation of nerve cells. All the research carried out so far indicate the influence of nanotubes’ functionalization degree on the properties of their suspension, as well as the characteristics of the deposited coating. It also influences the interaction between two types of nanomaterials. Functionalization in strong acids introduces functional groups which change nanotubes’ dimensions, properties and behavior in solution.
Źródło:
Engineering of Biomaterials; 2016, 19, 135; 13-20
1429-7248
Pojawia się w:
Engineering of Biomaterials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Charakterystyka właściwości powierzchniowych węgli kamiennych metodą frakcjonowanej flotacji powierzchniowej
Characteristic of hard coal surface properties using film flotation
Autorzy:
Sablik, J.
Wierzchowski, K.
Powiązania:
https://bibliotekanauki.pl/articles/318801.pdf
Data publikacji:
2001
Wydawca:
Polskie Towarzystwo Przeróbki Kopalin
Tematy:
właściwości powierzchniowe węgli kamiennych
frakcjonowana flotacja powierzchniowa
hard coal surface properties
film flotation
Opis:
Przedstawiono wyniki badań właściwości powierzchniowych węgli kamiennych to jest napięcia powierzchniowego zwilżania (γc) i niejednorodności energetycznej powierzchni (σγc) w zbiorach drobnych ziarn metodą frakcjonowanej flotacji powierzchniowej. Stwierdzono, że wartości średnie (γc) i wartości (σγc) zależą od stopnia uwęglenia węgla. Wartości tych parametrów można zmieniać zwilżając powierzchnię węgla odpowiednimi odczynnikami chemicznymi i uzyskiwać korzystne ich wartości z punktu widzenia technologii wzbogacania.
Results of tests of hard coal surface properties. i.e. critical surface tension of wetting (γc) and energetic nonhomogeneity of surface (σγc) in the assemblies of fine particles using film flotation are presented. It was stated that mean γc values and (σγc) values depend on the degree of coal coalification. Values of these parameters may be changed by coating the coal surface with appropriate chemical reagents in order to obtain better values from the point of view of enrichment technology.
Źródło:
Inżynieria Mineralna; 2001, R. 2, nr 2, 2; 7-20
1640-4920
Pojawia się w:
Inżynieria Mineralna
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Efficiency of response surface methodology for optimizing Reactive Blue 21 dye removal with modified bentonite
Autorzy:
Gharbani, P.
Powiązania:
https://bibliotekanauki.pl/articles/207178.pdf
Data publikacji:
2018
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
bentonite
efficiency
solutions
surface properties
textile industry
bentonit
efektywność
właściwości powierzchni
wyroby włókiennicze
Opis:
Bentonite was modified with cetyltrimethylammonium bromide by a simple method and was used as an adsorbent for the removal of Reactive Blue 21 dye. Reactive Blue 21 is an important dye used in the textile industry, which is very harmful for living creatures, especially humans. The response surface methodology (RSM) was used to study the effect of independent variables such as dye concentration (20, 40, 60, 80 and 100 mg/dm3), time (10, 20, 30, 40 and 50 min), initial pH (2, 4, 6, 8, 10) and modified bentonite dosage (1, 2, 3, 4 and 5 g/dm3) on Reactive Blue 21 dye removal efficiency from aqueous solutions. At the optimum conditions (modified bentonite dosage 5 g/dm3, dye concentration 61.3 mg/dm3, pH 4.78; time14.31 min), the predicted removal of Reactive Blue 21 on modified bentonite was 93.22%. In a confirmatory experiment, 92.01% dye removal has been obtained. Thus, the experimental investigation and statistical approach enabled us to model adsorption of Reactive Blue 21 on modified bentonite.
Źródło:
Environment Protection Engineering; 2018, 44, 2; 73-85
0324-8828
Pojawia się w:
Environment Protection Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
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