Difference between revisions of "Shear melting of a colloidal glass"

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[Under construction -- Nick Schade (fall 2009)]
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'''[Under construction -- Nick Schade (fall 2009)]'''
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The authors use confocal microscopy to investigate [[shear melting]] of [[colloid|colloidal]] [[glass|glasses]] at the microscopic level.  A phase transition occurs at a strain of about 8%, as this is when shear melting begins.  For larger shear strain than this, cooperative motions of groups of particles can be found, where the average group size is about 3 particles.  It is also evident that diffusive behavior of the particles is driven by shear for large strains.  In particular, it is found that the effective diffusion coefficient is linearly proportional to shear rate, and this can be explained mathematically with a modified form of the Stokes-Einstein model of diffusion in which thermal energy is replaced by shear energy.
  
 
==General Information==
 
==General Information==
  
'''Keywords''': [[colloid]], [[glass]], [[phase diagram]]
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'''Keywords''': [[colloid]], [[glass]], [[shear melting]], [[phase transition]]
  
 
'''Authors''': Christoph Eisenmann, Chanjoong Kim, Johan Mattsson, and [[David Weitz]].
 
'''Authors''': Christoph Eisenmann, Chanjoong Kim, Johan Mattsson, and [[David Weitz]].

Revision as of 19:35, 31 October 2009

[Under construction -- Nick Schade (fall 2009)]

The authors use confocal microscopy to investigate shear melting of colloidal glasses at the microscopic level. A phase transition occurs at a strain of about 8%, as this is when shear melting begins. For larger shear strain than this, cooperative motions of groups of particles can be found, where the average group size is about 3 particles. It is also evident that diffusive behavior of the particles is driven by shear for large strains. In particular, it is found that the effective diffusion coefficient is linearly proportional to shear rate, and this can be explained mathematically with a modified form of the Stokes-Einstein model of diffusion in which thermal energy is replaced by shear energy.

General Information

Keywords: colloid, glass, shear melting, phase transition

Authors: Christoph Eisenmann, Chanjoong Kim, Johan Mattsson, and David Weitz.

Date: February 4, 2009.

Departments of Physics and HSEAS, Harvard University, Cambridge, Massachusetts 02138, USA

Preprint (2009). [1]

Summary

Connection to soft matter