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Thick silica gel coatings on methylsilsesquioxane monoliths using anisotropic phase separation
Author(s) -
Kanamori Kazuyoshi,
Nakanishi Kazuki,
Hanada Teiichi
Publication year - 2006
Publication title -
journal of separation science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.72
H-Index - 102
eISSN - 1615-9314
pISSN - 1615-9306
DOI - 10.1002/jssc.200600163
Subject(s) - methyltrimethoxysilane , monolith , materials science , coating , wetting , chemical engineering , adsorption , phase (matter) , chromatography , layer (electronics) , porosity , silica gel , composite material , chemistry , catalysis , organic chemistry , engineering
Silica gel coatings on methyltrimethoxysilane (MTMS)‐derived monoliths have been studied using wetting transition. Wetting transition is observed in a small confined space, where a coating solution phase‐separates into a well‐coarsened dimension, making all the phase‐separating polymerizing silica phase dynamically flow onto the existing surface of a mold. Bulk coating experiments have shown reductions of both macropore volume and diameter due to the coated layer. Comparing HPLC efficiencies of the coated monolith with those of the non‐coated MTMS monolith revealed that the retention factors drastically increased in both normal‐ and reversed‐phase modes. This is attributed to the existence of considerable amounts of accessible micropores left inside the coated layer, where analyte molecules travel and adsorb for a considerable period of time.