Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 166, Issue 1-3, Pages 187-201Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/S0927-7757(99)00519-1
Keywords
fumed silica; 3-methacryloyloxypropyltrimethoxysilane; methacryloyloxymethylenemethyl diethoxysilane; modified silica; particle size distribution; zeta potential; H-1 NMR of unfrozen water; theoretical modelling of solvation
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Fumed silicas modified by 3-methacryloyloxypropyltrimethoxysilane (MAPTMS), methacryloyloxymethylenemethyl diethoxysilane (MMDES), and 3-aminopropyltriethoxysilane (APTES) were studied by means of TPD-DTG, IR, H-1 NMR, electrophoresis, photon correlation spectroscopy, and theoretical methods. The modification of fumed silica by these silanes strongly changes the zeta(pH) potential and the particle size distribution in aqueous suspensions depending on the amounts and the structure of a modifier. MMDES gives the better results in comparison with its mixture with APTES or individual MAPTMS in order to reduce the particle (agglomerate) size of modified silica at the modifier concentrations over the 0.05-0.2 mmol/g range. Crafted silanes reduce the hydrophilic properties of silica depending on the pretreatment conditions. Bound MMDES diminishes the zeta potential in contrast to MAPTMS. which markedly magnifies negative zeta potential at pH > 5 due to large amounts of residual =SiOR groups hydrolysed in the suspensions. (C) 2000 Elsevier Science B.V. All rights reserved.
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