A series of titania-silicas containing from 5 to 30% by mass of TiO 2 has been synthesized by repeating a cycle of chemi-sorption on the SiO2 surface followed by hydrolysis. In the IR spectra of the synthesized samples there is no absorption at 950 cm -1, which shows that the Si-O-(Ti) bond as well
Thermal Degradation of Polyvinylpyrrolidone on the Surface of Pyrogenic Silica
β Scribed by V. M. Bogatyrev; N. V. Borisenko; V. A. Pokrovskii
- Book ID
- 110315923
- Publisher
- SP MAIK Nauka/Interperiodica
- Year
- 2001
- Tongue
- English
- Weight
- 71 KB
- Volume
- 74
- Category
- Article
- ISSN
- 1070-4272
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formation of metal acac surface species covalently bonded to Chemical modification of a silica surface with chromium acetylthe support surface (2,6). Finally, chemical reaction of the acetonate (Cr(acac) 3 , acac Γ C 5 H 7 O 2 ) was carried out from the M n/ (acac) n molecule with coordinatively uns
In 1956, Sears had introduced a simple empirical method to determine the surface area of colloidal silicas. This technique consists in the titration of silanol groups using sodium hydroxide solution and relies on the assumption that the silanol group density is constant. When porosimetric methods be