Use of an organosilane coupling agent in colloidal silica coatings

M. W. Daniels, L. Chu, Lorraine F Francis

Research output: Contribution to journalConference articlepeer-review

7 Scopus citations

Abstract

Coatings were prepared from suspensions containing colloidal silica (20 nm) in isopropanol and 3-glycidoxypropyltrimethoxysilane (GPS). Thicker coatings without cracks were achieved by increased addition of GPS. The microstructure of the resultant coatings contained well packed colloids with some pore space. When high amounts of GPS were added (i.e., GPS:silica weight ratio (R) greater than 0.5), polymeric material appeared and covered the necks between particles and filled in pores. 29Si NMR of coating suspensions (R = 1) showed GPS hydrolysis within a few minutes and GPS adsorption on the silica surface within a few hours. The excess silane remained in solution and further polymerized, instead of forming a thick multilayer on the colloids. Diffuse reflectance IR spectroscopy data suggests saturated surface coverage beginning around 2 to 3 molecules/nm2 based on observed depletion of silica surface hydroxyls.

Original languageEnglish (US)
Pages (from-to)215-220
Number of pages6
JournalMaterials Research Society Symposium - Proceedings
Volume435
StatePublished - Dec 1 1996
EventProceedings of the 1996 MRS Spring Symposium - San Francisco, CA, USA
Duration: Apr 8 1996Apr 12 1996

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