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Mechanics and Microstructures of Concentrated Particle Gels

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It is often assumed that the viscoelastic properties of dense colloids are determined by the colloid volume fraction, the interaction potential, as well as the particle size distribution and shape. The dependence of the viscoelastic behavior of particle suspensions and gels on these parameters has been widely studied, and is well understood in many cases. In contrast, our knowledge on the influence of microstructure on mechanical and rheological properties, in particular for high solid loading suspensions as used in ceramic processing, is much less developed. This aspect has been the focus of recent experiments, which show that small changes in microstructure can have dramatic effects on the mechanics and dynamics of concentrated colloidal gels. In this article, we attempt to give an overview of the influence of microstructure on the mechanical and rheological properties of colloidal systems. Particular attention is given to colloidal particle gels at high volume fractions.

Document Type: Research Article


Affiliations: Nonmetallic Inorganic Materials, Department of Materials, Wolfgang–Pauli–Strasse 10, ETH Zurich, Zurich CH-8093, Switzerland

Publication date: September 1, 2005


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