The process of synthesizing silica nanopowder by the gas phase thermal oxidation of tetraethylorthosilicate (TEOS) in a diffusion flame reactor was simulated using a commercial computational fluid dynamic (CFD) code. The fuel combustion process and silica particle formation and growth in the flame are modeled. The temperature, velocity and particle size distribution (PSD) fields inside the reac...

The electrical properties of MIS structures with silicon oxynitride films, deposited at 200 C in a RF-plasma CVD reactor using Si(OC2H5)4 (TEOS) as a precursor and nitrogen as the gas ambient have been studied. The analysis of the capacitance-voltage and current–voltage characteristics has shown that a larger DC bias yields larger densities of dielectric charge and interface traps in the growin...

Microporous silica materials with a controlled pore size and a narrow pore size distribution have been prepared by sol-gel processing using an organic-templating approach. Microporous networks were formed by pyrolytic removal of organic ligands (methacryloxypropyl groups) from organic/inorganic hybrid materials synthesized by copolymerization of 3-methacryloxypropylsilane (MPS) and tetraethoxys...

Arvioitu teos: Minna Intke-Hernandez: Maahanmuuttajaäitien arjen kielitarinat. Etnografinen tutkimus kieliyhteisöön sosiaalistumisesta.Kasvatustieteellisiä tutkimuksia103. Helsinki: Helsingin yliopisto 2020. Johdanto 112 s. + 4 artikkelia. isbn 978-951-51-6837-5. Johdanto-osa saatavillaverkossa osoitteessa http://urn.fi/URN:ISBN:978-951-51-6838-2.

in this study, sio2 nanoparticles were successfully synthesized via sol-gel precipitation method and the effects of different parameters such as temperature, ethanol, ammonia and tetraethylorthosilicate (teos) contents based on water were investigated in a systematic way applying taguchi experimental design method. it was found that, among all the investigated parameters, ethanol as a co-solven...