Water, silica gel

CUSO4, HgCli Fresh water Silica gel G 0.1-1% Identification of ionized 72... 

Benesi and Jones (2) reported a broad 1100-cm-1 band in their study of the water-silica gel system. They also assigned the 870-cm-1 band to a bending vibration of SiOH groups and mention a reference (8) which states that silanols have a strong absorption band in the 830-880-cm-1 region. The presence of liquid water has obscured any possible detection of SiOH frequency in the present investigation, but it would probably be detectable if D20 were to be used as a solvent in place of water, because of its transparency in this range of the IR spectrum. 

A range of experiments were set up that used active desiccant (310,000Bq/g), concrete (8,950 Bq/g) and metal (llOBq/g) as tritium emanating source materials. RO water, silica gel, cellulose filter paper, plastic, metal, and various desiccants were used as potential receivers. The interaction with drying agents such as silica gel, zeolites and Drierite (CaS04) were also examined. 

Alkylation followed by attack of an oxygen-containing nucleophile took place resulting in formation of cyclobutane 5 on reaction of 5-cyclopropyl-l-phenylhex-5-en-3-ol (4) with triflic anhydride in the presence of 2,4,6-trimethylpyridine and then with water, silica gel or methanol the best yield was 88%.The influence of the cyclopropyl group is instru-... 

With the aid of a kinetic model for a biporous sorbent (144), Zolotarev et al. (143) described the diffusion and kinetics of sorption for water-silica gel systems. On the basis of this theoretical model, an explanation was given for the differences in the experimental kinetic curves for water-vapor sorption on biporous silica gels (143). The coefficients for the mass... 

Butanol. Acetic acid-Water Silica gel A polar system for flavonoid and glycosides. 

Relationships between changes in the Gibbs free energy (or melting temperature) of water silica gel and CSG and the amounts of unfrozen water. 

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