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Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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Microscopic structural relaxation in a sheared supercooled colloidal liquid.

Dandan Chen1, Denis Semwogerere, Jun Sato

  • 1Department of Physics, Emory University, Atlanta, Georgia 30322, USA. dchen@physics.emory.edu

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|April 7, 2010
PubMed
Summary
This summary is machine-generated.

Dense amorphous materials exhibit localized, isotropic particle rearrangements under shear. These plastic events are key to understanding material flow and structural relaxation dynamics.

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Area of Science:

  • Soft Matter Physics
  • Materials Science

Background:

  • The rheology of dense amorphous materials under large shear strain remains poorly understood.
  • Direct visualization of microscopic details in these materials is challenging.

Purpose of the Study:

  • To investigate shear-induced structural relaxation in amorphous materials.
  • To characterize the dynamics of plastic rearrangements at the particle level.

Main Methods:

  • Utilized a colloidal suspension as a model amorphous material.
  • Employed fast confocal microscopy for real-time observation.
  • Quantified particle rearrangements using multiple plasticity measures.

Main Results:

  • Observed spatially heterogeneous dynamics with localized regions of intense particle rearrangement.
  • Found these rearrangement regions to be essentially isotropic.
  • Determined that individual particles rearrange isotropically, aside from the overall strain bias.

Conclusions:

  • Spatially heterogeneous dynamics and isotropic rearrangement regions characterize the response of dense amorphous materials to shear.
  • Fast confocal microscopy provides crucial insights into the microscopic mechanisms of plastic flow in these systems.