Surface modification of oxidic nanoparticles using 3-methacryloxypropyltrimethoxysilane

W Posthumus; P C M M Magusin; J C M Brokken-Zijp; A H A Tinnemans; R van der Linde

doi:10.1016/j.jcis.2003.07.008

Surface modification of oxidic nanoparticles using 3-methacryloxypropyltrimethoxysilane

J Colloid Interface Sci. 2004 Jan 1;269(1):109-16. doi: 10.1016/j.jcis.2003.07.008.

Authors

W Posthumus¹, P C M M Magusin, J C M Brokken-Zijp, A H A Tinnemans, R van der Linde

Affiliation

¹ Laboratory for Solid State and Materials Chemistry, Coatings Technology, Eindhoven University of Technology, 5600 MB Eindhoven, The Netherlands. w.posthumus@tue.nl

PMID: 14651902
DOI: 10.1016/j.jcis.2003.07.008

Abstract

Tin oxide, antimony-doped tin oxide (ATO), and silica nanosized particles in aqueous dispersion were reacted with various amounts of 3-methacryloxypropyltrimethoxysilane (MPS). The kinetics were followed by 29Si NMR and the products were analyzed by FTIR and 29Si NMR. The kinetic experiments on ATO and silica revealed that the hydrolysis is the rate-determining step in these reactions. The reaction of MPS with the particles is favored over the homocondensation of MPS. Quantitative analysis using FTIR revealed that the amount of MPS grafted onto the tin oxide and silica particles is limited to the amount needed to fill one monolayer. For ATO the maximum amount of grafted MPS was only 50-70% of the amount that is needed for a closed monolayer. The MPS molecules are for the most part oriented parallel to the oxide surface, and a hydrogen bond between the MPS-carbonyl and the oxide is formed.