Modification of the surface of rutile powder by reaction with methylchlorosilanes

Alkylchlorosilanes react with oxide powders and under appropriate conditions the affinity of the surface for water vapour is reduced, i.e. the surface shows an increased degree of hydrophobicity. For rutile, trimethylchlorosilane at 45° C hydrogen bonds with single surface hydroxyl groups while at 2...

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Bibliographic Details
Published inPowder technology Vol. 7; no. 1; pp. 9 - 13
Main Authors Parfitt, G.D., Ramsbotham, J., Rochester, C.H.
Format Journal Article
LanguageEnglish
Published Elsevier B.V 1973
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Summary:Alkylchlorosilanes react with oxide powders and under appropriate conditions the affinity of the surface for water vapour is reduced, i.e. the surface shows an increased degree of hydrophobicity. For rutile, trimethylchlorosilane at 45° C hydrogen bonds with single surface hydroxyl groups while at 250° C chemical reaction occurs with the elimination of hydrogen chloride, and the rutile surface becomes resistant to the uptake of molecular water. Dimethyldichlorosilane also reduces the affinity of the surface for water, probably by reaction of single molecules of the silane with pairs of adjacent hydroxyl groups. Methyltrichlorosilane has a smaller effect, with chemisorption followed by hydrolysis leading to the formation of SiOSi siloxane bridges on the surface.
ISSN:0032-5910
1873-328X
DOI:10.1016/0032-5910(73)80003-8