Shear Melting of a Colloidal Glass | Zendy

Christoph Eisenmann | Zendy; Chan-Joong Kim | Zendy; Johan Mattsson | Zendy; David A. Weitz | Zendy

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Shear Melting of a Colloidal Glass

Author(s) -

Christoph Eisenmann,

Chan-Joong Kim,

Johan Mattsson,

David A. Weitz

Publication year - 2010

Publication title -

physical review letters

Language(s) - English

Resource type - Journals

SCImago Journal Rank - 3.688

H-Index - 673

eISSN - 1079-7114

pISSN - 0031-9007

DOI - 10.1103/physrevlett.104.035502

Subject(s) - materials science , shear (geology) , mean squared displacement , colloid , gaussian , shear flow , shear rate , colloidal particle , length scale , thermodynamics , optics , rheology , physics , mechanics , composite material , chemistry , molecular dynamics , quantum mechanics

We use confocal microscopy to explore shear melting of colloidal glasses, which occurs at strains of approximately 0.08, coinciding with a strongly non-Gaussian step size distribution. For larger strains, the particle mean square displacement increases linearly with strain and the step size distribution becomes Gaussian. The effective diffusion coefficient varies approximately linearly with shear rate, consistent with a modified Stokes-Einstein relationship in which thermal energy is replaced by shear energy and the length scale is set by the size of cooperatively moving regions consisting of approximately 3 particles.

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