Silica gel formation

Urine Adsorption onto XAD-2 resin, elution with acetone followed by clean up using acid-base partitioning and silica gel, formation of penta fluoropropyl derivative. GC/ECD 1 g/kg (ppb) 41 8 Bowman and Rushing 1981... 

P.W.J.G. Wijnen, A spectroscopic study of silica gel formation from aqueous silicate solutions, Ph.D. Thesis, TU Eindhoven, 1990. 

The processes which take place according to the mentioned stages are partially overlapped that brings to complications into the mechanism of silica gel formation and into the preparation of products with prescribed properties. In particular, it is impossible to obtain crystal silicic acid from gels under usual conditions. 

Silica Gel Formation in Diatoms. The proteins in the cell walls of several diatom species contain a relatively large proportion of serine [H2N—CH(CH20H)C(X)H], which contains aliphatic hydroxo groups that can... 

We also tested silica gel formation using the trialkoxy-substituted tri(silylvinyl)borazines 3-5. The gel formation was much slower (4 - 5 d) and not complete, i.e. residual alkoxy groups were detected by IR spectroscopy. Also, these materials had a significantly lower specific surface area ( 230m"/g). 

The formation of amorphous silica gels is an important process in modern industry because of their many applications. Most investigations in the field of silica gel preparation have contributed to the development of a physical chemical understanding of silica gel formation. As such, many... 

Wijnen, P.W. J.G. A Spectroscopic Study of Silica Gel Formation form Aqueous Silicate solution , Ph.D. Thesis, Eindhoven University, Holland (1990). 

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