On-line characterization of silica gels by acoustic near field
作者： B. Cros , M. Pauthe , M. Rguiti , J.Y. Ferrandis
DOI: 10.1016/S0925-4005(01)00598-6
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摘要: Abstract The acoustic near field technique consists in studying the features of resonance state an horn. alterations curve are investigated as a function evolution rheological properties medium to characterize. contact between sample and horn is obtained through immersion terminal section, probe, medium. Two peaks appears, whose impedance alteration representative viscosity We used this study silica gels from silicon alkoxide. higher frequency peak, very sensitive, characterize gelation step. This peak disappears during aging, characterized by lower peak. influence preparation parameters sol (catalyst type, hydrolysis water amount, solvent amount temperature) on gelation, aging final was studied.
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