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Shear Indxuced order of Cncenirated Dispersions

Published online by Cambridge University Press:  28 February 2011

Eruce J. Ackerson  and
T .A. Morris
Eruce J. Ackerson
Affiliation:
Department Of Physics, Oklahoma State University, Stillwater, Ok 74078
T .A. Morris
Affiliation:
Department Of Physics, Oklahoma State University, Stillwater, Ok 74078
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Abstract

The microstructure or interparticle ordering in concentrated dispersions of colloidal pmma (polymethylnethacrylate) particles in a mixture of tetralin and decalin have been monitored using light scattering techniques. These sterically stabilized, uniformly sized, nearly hard, colloidal spheres are observed to exhibit an equilibrium phase transition from a liquid-like ordering to a crystal-like ordering of suspended particles as the volume fraction of solids increases. The crystals have a close packed - random stacked structure. At the largest volume fractions a nonequilibrium glassy phase results.

Samples at different volume fractions are subjected to steady and oscillatory shear flow. Four basic structures are observed to exist: liquid or distorted liquid-like, string-like, sliding or randomly stacked layers, and face centered cubic (FCC) structures. Oscillatory shear studies will be reported here and are made as a function of strain amplitude and shear history, in addition to volume fraction. Generally, oscillatory shear is effective in ordering samples. For example, an unstable FCC ordering can be induced in an equilibrium liquid-like sample.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 180: Symposium A – Better Ceramics Through Chemistry IV , 1990 , 159
Copyright
Copyright © Materials Research Society 1990

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