Abstract
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 which attributed the tether hydrophilic-lipophilic balance (HLB). The reasons for this unexpected physical adsorption of CH4 at a temperature far above its boiling point are now being explored, along with the potential of these materials for selective hydrocarbon sensors and separators.
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