Vibrational properties of quasi-two-dimensional colloidal glasses with varying interparticle attraction

Matthew D. Gratale, Xiaoguang Ma, Zoey S. Davidson, Tim Still, Piotr Habdas, and A. G. Yodh
Phys. Rev. E 94, 042606 – Published 20 October 2016

Abstract

We measure the vibrational modes and particle dynamics of quasi-two-dimensional colloidal glasses as a function of interparticle interaction strength. The interparticle attractions are controlled via a temperature-tunable depletion interaction. Specifically, the interparticle attraction energy is increased gradually from a very small value (nearly hard-sphere) to moderate strength (4kBT), and the variation of colloidal particle dynamics and vibrations are concurrently probed. The particle dynamics slow monotonically with increasing attraction strength, and the particle motions saturate for strengths greater than 2kBT, i.e., as the system evolves from a nearly repulsive glass to an attractive glass. The shape of the phonon density of states is revealed to change with increasing attraction strength, and the number of low-frequency modes exhibits a crossover for glasses with weak compared to strong interparticle attraction at a threshold of 2kBT. This variation in the properties of the low-frequency vibrational modes suggests a new means for distinguishing between repulsive and attractive glass states.

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  • Received 30 June 2016

DOI:https://doi.org/10.1103/PhysRevE.94.042606

©2016 American Physical Society

Physics Subject Headings (PhySH)

Polymers & Soft Matter

Authors & Affiliations

Matthew D. Gratale1, Xiaoguang Ma1,2, Zoey S. Davidson1, Tim Still1, Piotr Habdas3,*, and A. G. Yodh1,†

  • 1Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
  • 2Complex Assemblies of Soft Matter, CNRS-Solvay-UPenn UMI 3254, Bristol, Pennsylvania 19007-3624, USA
  • 3Department of Physics, Saint Joseph's University, Philadelphia, Pennsylvania 19131, USA

  • *Corresponding author: phabdas@sju.edu
  • Corresponding author: yodh@physics.upenn.edu

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Issue

Vol. 94, Iss. 4 — October 2016

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