Diffusing-wave spectroscopy of concentrated alumina suspensions during gelation

H.M. Wyss, S. Romer, F. Scheffold, P. Schurtenberger, L.J. Gauckler

Research output: Contribution to journalArticleAcademicpeer-review

59 Citations (Scopus)

Abstract

Using diffusing-wave spectroscopy, we followed the aggregation and gelation of concentrated (30 vol%) alumina suspensions. The suspensions were destabilized by either shifting the pH to the isoelectric point or by increasing the ionic strength. Both effects can be achieved continuously and homogeneously by using an enzyme-catalyzed internal chemical reaction. Based on the light-scattering data, we could derive quantitative information about the sol–gel transition and the viscoelastic properties of the gels, as well as a characterization of changes in the microstructure. The elastic moduli determined from light scattering are found to be in good agreement with rheological measurements.
Original languageEnglish
Pages (from-to)89-97
JournalJournal of Colloid and Interface Science
Volume241
Issue number1
DOIs
Publication statusPublished - 2001
Externally publishedYes

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