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Evidence for an unusual dynamical-arrest scenario in short-ranged colloidal systems

G. Foffi, K. A. Dawson, S. V. Buldyrev, F. Sciortino, E. Zaccarelli, and P. Tartaglia
Phys. Rev. E 65, 050802(R) – Published 21 May 2002
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Abstract

Extensive molecular dynamics simulation studies of particles interacting via a short-ranged attractive square-well potential are reported. The calculated loci of constant diffusion coefficient D in the temperature-packing fraction plane show a reentrant behavior, i.e., an increase of diffusivity on cooling, confirming an important part of the high volume-fraction dynamical-arrest scenario earlier predicted by theory for particles with short-ranged potentials. The more efficient localization mechanism induced by the short-range bonding provides, on average, additional free volume as compared to the hard-sphere case and results in faster dynamics.

  • Received 21 January 2002

DOI:https://doi.org/10.1103/PhysRevE.65.050802

©2002 American Physical Society

Authors & Affiliations

G. Foffi1, K. A. Dawson1, S. V. Buldyrev2,3, F. Sciortino2, E. Zaccarelli2, and P. Tartaglia2

  • 1Irish Centre for Colloid Science and Biomaterials, Department of Chemistry, University College Dublin, Belfield, Dublin 4, Ireland
  • 2Dipartimento di Fisica, Istituto Nazionale di Fisica della Materia, and INFM, Center for Statistical Mechanics and Complexity, Università di Roma “La Sapienza,” Piazzale Aldo Moro 5, I-00185 Rome, Italy
  • 3Center for Polymer Studies and Department of Physics, Boston University, Boston, Massachusetts 02215

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Vol. 65, Iss. 5 — May 2002

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