Water Adsorption Properties on Porous Silica Glass Surface Modified by Trimethylsilyl Groups
✍ Scribed by Takashi Takei; Atsushi Yamazaki; Tohru Watanabe; Masatoshi Chikazawa
- Publisher
- Elsevier Science
- Year
- 1997
- Tongue
- English
- Weight
- 126 KB
- Volume
- 188
- Category
- Article
- ISSN
- 0021-9797
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✦ Synopsis
adsorption on alkylsilylated silica surfaces (5, 6,12), there Nitrogen and water adsorption properties on the porous silica are few studies about the process of the multilayer formation glass surfaces modified by different concentration of trimethylsilyl of water molecules adsorbed on such surfaces. Information (TMS) groups were studied. The specific surface areas and paramof the multilayer adsorption mechanism of water on alkylsieter C values in the BET equation estimated from nitrogen adsorplylated porous silica surfaces is useful for the studies of the tion decreased with increase in the surface concentration of the wetting and following capillary condensation phenomenon.
TMS groups and became constant values above 1.0 TMS group
Porous silica glasses are adequate for the study of such adper nm 2 . The water adsorption property suggested that a highly sorption phenomena as a model of porous silicas, because silylated sample still represented hydrophilic character in initial they have mesopores, monodispersed pore size distributions adsorption process. Water molecules interact with the residual hydroxyl groups existing under the umbrellas of the TMS groups and high surface areas, and their surface hydroxyls have and form clusters. Above the concentration of 1.0 TMS group per been studied in our previous paper (7). The objectives of nm 2 the capillary condensation of water vapor did not occur. The this article are to investigate precisely the nitrogen and water TMS groups interrupt to build a two-dimensional network of each adsorptions on porous silica glass surfaces with different cluster. The formation of multilayer adsorption of water molecules surface concentrations of trimethylsilyl (TMS) groups and depends on the magnitude of hydrophilic patch areas which are to speculate the multilayer adsorption mechanism of water surrounded by TMS groups.