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The zeta potential and the mean particle size of fine silica powder modified with quaternary ammonium groups having alkyl chains of various lengths (-N + (C m H 2m + 1)(CH 3 ) 2 ,m=4, 6, and 8 were measured as a function of pH or electrolyte concentration in suspensions.The zeta potentials of the modified fine silica powder as a function of pH constantly showed...
Fine silica powders were modified with quaternary ammonium groups, and the products were characterized in various respects. 1,3,5,7-Tetramethylcyclotetrasiloxane was deposited on fine silica powder at 80°C by a chemical vapor deposition method, where it was catalytically polymerized to form a surface coating of polymethylsiloxane. Fine silica powder modified with quaternary ammonium groups (XNm,...
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