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Material Type: Internet resource Document Type: Internet Resource, Archival Material All Authors / Contributors: Schweizer, Kenneth S.; Granick, Steve; Higdon, Jonathan J.; Lewis, Jennifer A.; Zhang, Rui OCLC Number: 779637289 Language Note: English Abstract: The naïve mode coupling theory (NMCT) for ideal kinetic arrest and the nonlinear Langevin equation (NLE) theory of activated single-particle barrier hopping dynamics are generalized to describe coupled center-of-mass (CM) translational and rotational motions of uniaxial particles within the interaction site formalism. The approach is based on the time-dependent scalar displacements of the particle CM and cumulative rotational angle as the relevant slow variables, and a two-dimensional dynamic free energy surface determined by equilibrium structure which quantifies localizing forces and torques. For hard-core uniaxial objects, three types of dynamic phases are predicted: fluid, plastic glass and double glass, the boundaries of which meet at a triple point corresponding to a most difficult to vitrify diatomic of aspect ratio ~ 1.43. The real space nature of the cage escape process is increasingly controlled by CM translation relative to rotational motion as the aspect ratio grows. The kinetic vitrification volume fraction and elastic shear modulus are nonmonotonic functions of aspect ratio. The first microscopic theory of the nonlinear viscoelasticity of dense fluids of nonspherical particles is presented. It provides a first principles explanation of the striking two-step yielding phenomenon experimentally observed in very concentrated low aspect ratio hard dicolloid suspensions. Stress induces a much stronger barrier softening effect on the second-step CM translation barrier than the first-step primarily rotational barrier. This barrier softening “mismatch” results in the prediction that for both absolute and dynamic yielding, the double yielding phenomena only occurs over a window of high volume fractions, which shifts to higher values for lower stress-sweep frequency. For large aspect ratio dicolloids, only one barrier exists for all stresses corresponding to a cooperative translation-rotation motion, and the translational motion is more dominant in the barrier ho

Title : Theory of slow coupled translational-rotational dynamics and viscoelasticity of nonspherical particle suspensions
Author : Schweizer, Kenneth S.; Granick, Steve; Higdon, Jonathan J.; Lewis, Jennifer A.; Zhang, Rui
Language : en
Rating :
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Type : PDF, ePub, Kindle
Uploaded : Apr 12, 2021

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