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Organic tethers have been incorporated into acid- and base-catalysed silica sol–gels. The surface area is modified by this insertion suggesting an interaction at a molecular level. The HCl-catalysed SiO2 sol–gel had its relative extent of adsorption at 298 K of CH4 relative to H2O: (i) depressed by the addition of 5% bis(triethoxysilyl)methane (ii) increased by the addition of 5% bis(trimethoxysilyl)hexane...
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