title: NMR relaxation studies of porous sol-gel glasses.
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.
authors.affiliation: School of Chemistry, University of New South Wales, Sydney, Australia.
authors.forename: S
authors.initials: S
authors.lastname: Wonorahardjo
authors.forename: G
authors.initials: G
authors.lastname: Ball
authors.forename: J
authors.initials: J
authors.lastname: Hook
authors.forename: G
authors.initials: G
authors.lastname: Moran
mesh_terms: D017709:Fractals; D005782:Gels; D006801:Humans; D006863:Hydrogen-Ion Concentration; D009682:Magnetic Resonance Spectroscopy; D011142:Polyvinyl Alcohol; D016062:Porosity; D012821:Silanes
chemical_list: D005782:Gels; D012821:Silanes; C061205:tetramethoxysilane; D011142:Polyvinyl Alcohol