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NMR relaxation studies of porous sol-gel glasses
S Wonorahardjo1, G Ball, J Hook
1School of Chemistry, University of New South Wales, Sydney, Australia.
Magnetic Resonance Imaging
|November 6, 1998
Abstract:
2H relaxation times T1, T1 rho and T2 for D2O in silica sol-gels are used to monitor porosity and surface interactions within the silica framework as a function of aging. Tetramethoxysilane gels are compared with composites containing low levels of poly(vinyl alcohol) (PVA) prepared under acidic conditions. Non-exponential decay of magnetisation in T1 rho and T2 experiments is attributed to the fractal nature of the pore structure.