Activated dynamics in dense fluids of attractive nonspherical particles. I. Kinetic crossover, dynamic free energies, and the physical nature of glasses and gels

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dc.contributor.author Tripathy, Mukta
dc.contributor.author Schweizer, Kenneth S.
dc.date.accessioned 2014-03-16T10:29:56Z
dc.date.available 2014-03-16T10:29:56Z
dc.date.issued 2011-04
dc.identifier.citation Tripathy, Mukta and Schweizer, K. S., "Activated dynamics in dense fluids of attractive nonspherical particles. I. Kinetic crossover, dynamic free energies, and the physical nature of glasses and gels", Physical Review E, DOI: 10.1103/PhysRevE.83.041406, vol. 83, no. 4, pp. 041406:1-10, Apr. 2011. en_US
dc.identifier.issn 1550-2376
dc.identifier.uri http://dx.doi.org/10.1103/PhysRevE.83.041406
dc.identifier.uri https://repository.iitgn.ac.in/handle/123456789/765
dc.description.abstract We apply the center-of-mass versions of naïve mode coupling theory and nonlinear Langevin equation theory to study how short-range attractive interactions modify the onset of localization, activated single-particle dynamics, and the physical nature of the transiently arrested state of a variety of dense nonspherical particle fluids (and the spherical analog) as a function of volume fraction and attraction strength. The form of the dynamic crossover boundary depends on particle shape, but the reentrant glass-fluid-gel phenomenon and the repulsive glass-to-attractive glass crossover always occur. Diverse functional forms of the dynamic free energy are found for all shapes including glasslike, gel-like, a glass-gel form defined by the coexistence of two localization minima and two activation barriers, and a “mixed” attractive glass characterized by a single, very short localization length but an activation barrier located at a large displacement as in repulsive-force caged glasses. For the latter state, particle trajectories are expected to be of a two-step activated form and can be accessed at high attraction strength by increasing volume fraction, or by increasing attraction strength at fixed high enough volume fraction. A new classification scheme for slow dynamics of fluids of dense attractive particles is proposed based on specification of both the nature of the localized state and the particle displacements required to restore ergodicity via activated barrier hopping. The proposed physical picture appears to be in qualitative agreement with recent computer simulations and colloid experiments. en_US
dc.description.statementofresponsibility by Mukta Tripathy and K. S. Schweizer
dc.format.extent vol. 83, no. 4, pp. 041406:1-10
dc.language.iso en en_US
dc.publisher American Physical Society en_US
dc.subject Activated dynamics en_US
dc.subject Activation barriers en_US
dc.subject Barrier hopping en_US
dc.subject Center-of-mass en_US
dc.subject Classification scheme en_US
dc.subject Dynamic crossover en_US
dc.title Activated dynamics in dense fluids of attractive nonspherical particles. I. Kinetic crossover, dynamic free energies, and the physical nature of glasses and gels en_US
dc.type Article en_US
dc.relation.journal Physical Review E


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