Informacja

Drogi użytkowniku, aplikacja do prawidłowego działania wymaga obsługi JavaScript. Proszę włącz obsługę JavaScript w Twojej przeglądarce.

Wyszukujesz frazę "silica surface" wg kryterium: Temat


Wyświetlanie 1-6 z 6
Tytuł:
Amano Lipase A grafting onto a silica surface
Autorzy:
Zdarta, J.
Jesionowski, T.
Powiązania:
https://bibliotekanauki.pl/articles/81057.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
Amano Lipase A
immobilization
grafting
silica surface
biocatalyst
hydrolysis
tetraethoxysilane
glutaraldehyde
Źródło:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology; 2013, 94, 1
0860-7796
Pojawia się w:
BioTechnologia. Journal of Biotechnology Computational Biology and Bionanotechnology
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Collection of Industrial Oil Using Nanoparticles and Porous Powders of Silica
Autorzy:
Cho, Y.-S.
Moon, J.-W.
Powiązania:
https://bibliotekanauki.pl/articles/351139.pdf
Data publikacji:
2017
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
silica nanopowders
surface modification
porous silica
oil removal
Opis:
Industrial oil was collected using hydrophobic silica powders. Silica nanopowder was modified with octadecyltriethoxysilane (OTS) using spray pyrolysis reactor continuously. Besides nanoparticles, mesoporous silica powder synthesized using Pluronic P104 was adopted as another oil adsorbents. Spherical macroporous or meso-macroporous silica particles were prepared by selfassembly for the removal of oil. The effects of the amount of powder on the oil adsorption were studied and compared with the results of various silica powders. The meso-macroporous silica particles were found to be the most efficient, indicating that both specific surface area and porosity played crucial role.
Źródło:
Archives of Metallurgy and Materials; 2017, 62, 2B; 1371-1375
1733-3490
Pojawia się w:
Archives of Metallurgy and Materials
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Surface properties of the doped silica hydrophobic coatings deposited on plasma activated glass supports
Autorzy:
Chodkowski, Michał
Terpiłowski, Konrad
Goncharuk, Olena
Powiązania:
https://bibliotekanauki.pl/articles/110289.pdf
Data publikacji:
2019
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
hydrophobicity
surface chemistry
glass
silica
sol-gel method
immersion
plasma
Opis:
The paper discusses preparation and characteristics of silica hydrophobic layers deposited on the plasma-modified glass supports. The surfaces were investigated using wettability measurements, profilometry, photoacoustic and infrared spectroscopy, X-ray photoelectron spectroscopy as well as scanning electron microscopy. The wettability measurements showed that the obtained surfaces are hydrophobic – the water contact angle was in the range of 140-150 degrees. The photoacoustic and infrared spectroscopy as well as X-ray photoelectron spectroscopy disclosed the surface compositions, particularly that of the hydrophobic alkyl groups deposited on them. They were methyl groups introduced during hydrophobization by hexamethyldisilazane. In addition, it was found that the number of groups on the surface depends on the kind of plasma by which the supports were activated. The optical profilometer showed differences in the surface roughness which affects their hydrophobicity. Moreover, the surface free energies were determined using the contact angle hysteresis method. They disclosed differences in each surface, depending on the way of supports activation. The largest hydrophobicity was obtained on the layer deposited on the support activated by the argon plasma. However, support activation by the air plasma resulted in a decrease of hydrophobicity compared to that of the non-activated surface.
Źródło:
Physicochemical Problems of Mineral Processing; 2019, 55, 6; 1450-1459
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Electrokinetic properties of silica-titania mixed oxide particles dispersed in aqueous solution of C.I. Direct Yellow 142 dye – effects of surfactant and electrolyte presence
Autorzy:
Chibowski, Stanisław
Wiśniewska, Małgorzata
Wawrzkiewicz, Monika
Hubicki, Zbigniew
Goncharuk, Olena
Powiązania:
https://bibliotekanauki.pl/articles/1450752.pdf
Data publikacji:
2020
Wydawca:
Politechnika Wrocławska. Oficyna Wydawnicza Politechniki Wrocławskiej
Tematy:
silica-titania composite
mixed oxides
zeta potential
solid surface charge density
dye adsorption
surfactant effect
Opis:
The mixed $SiO_2$-$TiO_2$ oxide obtained by the pyrogenic method with the silica:titanium percentage ratio equal to 20:80 (ST80) was used in the experiments. The influence of azo dye C.I. Direct Yellow 142 (DY) adsorption at the mixed oxide-solution interface on the electrokinetic properties of solid particles was studied. To determine solid surface charge density and zeta potential of examined suspensions the potentiometric titration and Doppler laser electrophoresis techniques were applied. The changes in structure of electrical double layer formed on the mixed oxide surface in the dye presence were specified as a function of DY concentration, inorganic salt addition and surfactant introduction. The effects of surfactant type and its concentration were determined. Three surfactants of different ionic character (anionic SDS, cationic CTAB and nonionic Triton X-100) were used in measurements. The obtained electrokinetic characteristics of ST80 mixed oxide dispersed in aqueous solutions with various adsorbate compositions is essential for such suspensions stability.
Źródło:
Physicochemical Problems of Mineral Processing; 2020, 56, 6; 6-13
1643-1049
2084-4735
Pojawia się w:
Physicochemical Problems of Mineral Processing
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Investigations of protective coatings for castings of high-manganese cast steels
Autorzy:
Holtzer, M.
Bobrowski, A.
Drożyński, D.
Mocek, J.
Powiązania:
https://bibliotekanauki.pl/articles/382308.pdf
Data publikacji:
2013
Wydawca:
Polska Akademia Nauk. Czytelnia Czasopism PAN
Tematy:
high manganese cast steel
protective coating
silica sand
quality of surface
staliwo wysokomanganowe
powłoka ochronna
piasek kwarcowy
jakość powierzchni
Opis:
When cast steel castings are made in moulding sands on matrices of high-silica sand, which has a low fire resistance the problem of the so-called chemical penetration is distinctly visible. Whereas this effect appears to a small degree only when moulding sand matrices are of chromite, zircon or olivine sands. Therefore in case of making castings of high-manganese cast steel (e.g. Hadfield steel) sands not containing free silica should be applied (e.g. olivine sand) or in case of a high-silica matrix protective coatings for moulds and cores should be used. Two protective coatings, magnesite alcoholic (marked as coating 1 and coating 2) originated from different producers and intended for moulds for castings of the Hadfield steel, were selected for investigations. Examinations of the basic properties were performed for these coatings: viscosity, thermal analysis, sedimentation properties, wear resistance. In order to estimate the effectiveness of protective coatings the experimental castings were prepared. When applying coating 1, the surface quality of the casting was worse and traces of interaction between the casting material (cast steel) and the coating were seen. When protective coating 2 was used none interactions were seen and the surface quality was better.
Źródło:
Archives of Foundry Engineering; 2013, 13, 1; 39-44
1897-3310
2299-2944
Pojawia się w:
Archives of Foundry Engineering
Dostawca treści:
Biblioteka Nauki
Artykuł
Tytuł:
Wpływ nanododatków ceramicznych na charakterystyki tribologiczne biodegradowalnych smarów plastycznych
The influence of ceramic additives on tribological characteristics of biodegradable lubricating greases
Autorzy:
Kozdrach, R.
Powiązania:
https://bibliotekanauki.pl/articles/190007.pdf
Data publikacji:
2012
Wydawca:
Stowarzyszenie Inżynierów i Techników Mechaników Polskich
Tematy:
smar plastyczny
właściwości przeciwzużyciowe
właściwości przeciwzatarciowe
powierzchnia tarcia
krzemionka amorficzna
krzemiany warstwowe
dodatki smarne
aparat czterokulowy
lubricating grease
antiwear properties
antiscuffing properties
friction surface
amorphous silica
silicates of stratified
lubricating additives
four-ball machine
Opis:
W publikacji przedstawiono wyniki badań wpływu dodatków ceramicznych na właściwości tribologiczne wybranych kompozycji smarowych. Do modyfikacji smarów plastycznych wytworzonych na bazie mineralnej, syntetycznej oraz roślinnej i zagęszczonych stearynianem litu zastosowano płomieniową krzemionkę amorficzną AerosilŽ oraz montmorylonit jako przedstawiciel krzemianów warstwowych. Za pomocą aparatu czterokulowego wykonano testy tribologiczne dla smarów bazowych, tzn. niezawierających dodatków modyfikujących, i porównano je z wynikami uzyskanymi dla smarów plastycznych zmodyfikowanych wyżej wymienionymi dodatkami. Do oceny tych właściwości wykorzystano wyniki badań granicznego obciążenia zużycia, obciążenia zespawania, obciążenia zacierającego, granicznego obciążenia zatarcia oraz granicznego nacisku zatarcia. Na podstawie wyników badań tribologicznych wybranych kompozycji smarowych stwierdzono, że zastosowane dodatki modyfikujące w postaci krzemionki amorficznej oraz montmorylonitu korzystnie wpływają na zmianę wartości poszczególnych parametrów określających poziom właściwości smarnych badanych kompozycji smarowych.
The paper presents the results of research of ceramic additives on the change of the tribological properties of selected lubricating compositions. The study used of greases based on paraffin oil of pharmaceutical purity, rapeseed oil, and synthetic oil Priolube 3970. As a thickener of lubricating greases, lithium stearate was used. The lubricating compositions were produced using modified ceramic additives in the form of flame amorphous silica Aerosil and laminated silicates in the form of montmorillonite. These additives in amount of 8% m/m were introduced to the structure of each grease. In the early phase of the experiment, tribological tests of compositions containing from 1 to 10% additives were carried out to determine the optimum amount of lubricating compositions. The tribological tests were carried out using four-balls apparatus for lubricating greases not containing the modified additive, and the results were compared to the results obtained for lubricating greases modified with additives mentioned above. The tribological properties of the tested compositions were determined by measurement of the limiting load of wear (Goz/40), welding load (Fz), scuffing load (Ft), limiting load of scuffing (Foz), and the limiting pressure of seizure (Foz). The research affirmed, that the flame amorphous silica is a less effective modifier for reducing anti-scuffingly by stepwise increasing load of the friction, under conditions of linearly increasing load, seizure, and anti-wear under constant load of the friction than montmorillonite regardless of the base oil. However, the flame amorphous silica improves the resistance to scuffing of the surface layer and wear in relation the basic lubricating compositions.
Źródło:
Tribologia; 2012, 4; 75-88
0208-7774
Pojawia się w:
Tribologia
Dostawca treści:
Biblioteka Nauki
Artykuł
    Wyświetlanie 1-6 z 6

    Ta witryna wykorzystuje pliki cookies do przechowywania informacji na Twoim komputerze. Pliki cookies stosujemy w celu świadczenia usług na najwyższym poziomie, w tym w sposób dostosowany do indywidualnych potrzeb. Korzystanie z witryny bez zmiany ustawień dotyczących cookies oznacza, że będą one zamieszczane w Twoim komputerze. W każdym momencie możesz dokonać zmiany ustawień dotyczących cookies