Search results for " electric modulu"

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Dynamic properties of solvent confined in silica gels studied by broadband dielectric spectroscopy

2007

Abstract We report the results of a broadband (10−2–107 Hz) dielectric spectroscopy study on a solvent system (glycerol–water solution) confined in a porous silica matrix. The dielectric relaxation of the system is studied as a function of both temperature (120–280 K) and solvent composition (0–36 glycerol molar percentage), at constant matrix composition. Our data show that glycerol–water systems confined inside silica gel are characterized by a very complex dynamics quite different from that observed in solution, thus indicating that confinement may deeply modify solvent dynamics. Indeed in addition to the relaxation processes similar to those occurring in bulk samples, new dielectric rel…

PermittivityArrhenius equationMaterials scienceSilica gelDielectric properties relaxation electric moduluWater in glassWaterAerogelDielectricCondensed Matter PhysicsSol–Gels (xerogels)Electronic Optical and Magnetic MaterialsDielectric spectroscopySolventsymbols.namesakechemistry.chemical_compoundchemistryChemical physicsMaterials ChemistryCeramics and CompositessymbolsSol–gel aerogel and solution chemistrySol-gelJournal of Non-Crystalline Solids

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