نتایج جستجو برای: زروژل teos
تعداد نتایج: 746 فیلتر نتایج به سال:
This study investigates methods for improving the heat resistance of polyvinyl alcohol/alkali lignin foam material (PLFM). Tetraethoxysilane (TEOS) was used as a precursor to prepare PLCFM by a sol-gel method. The PLCFM, prepared with different levels of TEOS, was characterized by Fourier Transform Infrared spectrometry (FTIR), Differential Scanning Calorimetry (DSC), and Thermogravimetric Anal...
Abstract The thermal equation of state (TEOS) for solids is a mathematic model among pressure, temperature and density, essential geophysical, geochemical, other high pressure–temperature (high P–T) researches. However, in the last few decades, there has been growing concern about accuracy pressure scales calibrants, efforts have made to improve it by either introducing reference standard or bu...
Tetraethyl orthosilicate (TEOS) is extensively used in the conservation of stone-built cultural heritage, which often subjected to water-induced degradation processes. The goal this study was produce and a TEOS-based material with ability repel liquid water. A sol solution TEOS 1H,1H,2H,2H-perfluorooctyl triethoxysilane (FAS) prepared deposited on marble. static contact angles (CAs) water drops...
Granulation method in the mixture of oil, water, and PVA was used to synthesize HA/βTCP porous nano-powders. Results showed that the presence of oil in PVA/oil system results in crystallization of mesoporous HA/βTCP particles with the surface area of 93 cm2/g. Using Rietveld method, the amounts of HA/βTCP and amorphous phases in the oven-dried PVA substrate powders after heat-treatment were cal...
Arvosteltu teos: Kallinen, Kati & Pirskanen, Henna 2022. Lasten ja nuorten tutkimushaastattelu. Helsinki: Gaudeamus. 268 s.
the direct conversion of methane to c2 hydrocarbons, in a quartz tube reactor enforced by a dc corona discharge, was investigated at atmospheric pressure. the process was carried out in the presence of metal oxide catalysts of mn/w/sio2, mn/w/sio2 (tetraethyl orthosilicate, teos), and mn/w/cnt (supported on carbon nanotubes). the total yield to c2 hydrocarbons in the presence of metal oxide cat...
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