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Available online at www.sciencedirect.com Journal of the European Ceramic Society 28 (2008) 14431449

Summary: Available online at www.sciencedirect.com
Journal of the European Ceramic Society 28 (2008) 14431449
Microstructures and mechanical properties of dense particle
gels: Microstructural characterisation
Iwan Schenkera,, Frank T. Filsera,
Tomaso Asteb, Ludwig J. Gaucklera
a Nonmetallic Materials, Department of Materials, ETH Zurich, Zurich CH-8093, Switzerland
b Department of Applied Mathematics, RSPhysSE, The Australian National University, 0200 Australia
Available online 28 January 2008
The macroscopic mechanical properties of wet ceramic green bodies and densely packed coagulated colloidal particle gels strongly depend on
the local arrangement of the powder particles on length scales of a few particle diameters. Heterogeneous microstructures exhibit up to one order
of magnitude higher elastic properties and yield strengths than their homogeneous counterparts. The microstructures of these gels are analysed
by the "straight path" method quantifying quasi-linear arrangements of particles. They show similar characteristics than force chains bearing the
mechanical load in granular material. Applying this concept to gels revealed that heterogeneous colloidal microstructures show a significantly
higher straight path density and exhibit longer straight paths than their homogeneous counterparts.
2007 Elsevier Ltd. All rights reserved.
Keywords: Suspensions; Mechanical properties; Structure and microstructure; Granular matter
1. Introduction
Mechanical properties of coagulated colloids are impor-


Source: Aste, Tomaso - Department of Applied Mathematics, Australian National University


Collections: Physics