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Rheologica Acta

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01-07-2008 | Original Contribution

Effects of particle softness on the rheology and yielding of colloidal glasses

Authors: Arnaud Le Grand, George Petekidis

Published in: Rheologica Acta | Issue 5-6/2008

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Abstract

We studied the linear and nonlinear rheology of colloidal glasses consisting of hard spheres and soft core-shell particles at several volume fractions to explore the effects of particle softness on the mechanical properties and yielding. Creep and recovery and oscillatory shear measurements were used to determine the shear elastic modulus and the yield strain. Both hard and soft sphere glasses exhibited ‘entropic cage elasticity’ below random close packing, whereas for compressed soft spheres at higher effective volume fractions, the yield strain was determined by shell elasticity. The shear modulus followed a strong increase with volume fraction for hard spheres and a much weaker one for soft particles reflecting their interparticle potential. Nonlinear effects, revealed as strong distortions of the stress signal during yielding, were analyzed via Fourier transform rheology and Lissajous plots. The significant contribution of the nonlinearities was analyzed in terms of strain softening and hardening mechanisms within a cycle of oscillation and discussed in relation to particle softness.

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Title: Effects of particle softness on the rheology and yielding of colloidal glasses
Authors: Arnaud Le Grand
George Petekidis
Publication date: 01-07-2008
Publisher: Springer-Verlag
Published in: Rheologica Acta / Issue 5-6/2008
Print ISSN: 0035-4511
Electronic ISSN: 1435-1528
DOI: https://doi.org/10.1007/s00397-007-0254-z

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