Surface modification of oxidic nanoparticles using 3- methacryloxypropyltrimetho

2019-08-12 10:27:18

The particles MPS oxide ATO

责任者: Posthumus, W.;Magusin, P.C.M.M.;Brokken-Zijp, J.C.M.;Tinnemans, A.H.A.;Van Der Linde, R. 单位: Lab. for Solid State and Mat. Chem., Coatings Technology, Eindhoven University of Technology, 5600 MB Eindhoven, Netherlands 来源出处: Journal of Colloid and Interface Science,2004,269(1):109-116 摘要: 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. © 2003 Elsevier Inc. All rights reserved. 关键词: Nanostructured materials;Surface treatment;Silanes;Dispersions;Hydrolysis;Monolayers;Hydrogen bonds;Grafting (chemical);Condensation;Fourier transform infrared spectroscopy;Nuclear magnetic resonance spectroscopy;Reaction rates