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Role of polydispersity in anomalous interactions in electrostatically levitated colloidal systems

J. Chem. Phys. 123, 174904 (2005); doi:10.1063/1.2074887

Published 31 October 2005

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Todd O. Pangburn and Michael A. Bevan
Department of Chemical Engineering, Texas A&M University, College Station, Texas 77843-3122
In this paper, we investigate the effects of using inverse analyses developed for monodisperse particles to extract particle-particle and particle-surface potentials from simulated interfacial colloidal configurations having finite-size polydispersity. Forward Monte Carlo simulations are used to generate three-dimensional equilibrium configurations of log normal-distributed polydisperse particles confined by gravity near an underlying surface. Particles remain levitated above the substrate and stabilized against aggregation by repulsive electrostatic Derjaguin-Landau-Verwey-Overbeek pair potentials. An inverse Ornstein-Zernike analysis and an inverse Monte Carlo simulation method are used to obtain interactions from simulated distribution functions as a function of polydispersity (sigma), relative range of repulsion (kappa[overline a]), and projected interfacial concentration (rho). Both inverse analyses successfully recover input potentials for all monodisperse cases, but fail for polydispersities often encountered in experiments. For different conditions (sigma, kappa[overline a], and rho), our results indicate softened short-range repulsion, anomalous long-range attraction, and apparent particle overlaps, which are similar to commonly reported observations in optical microscopy measurements of quasi-two-dimensional interfacial colloidal ensembles. By demonstrating signatures of, and limitations due to, polydispersity when extracting pair potentials from measured distribution functions, our specific goal is to provide a basis to objectively interpret and resolve the effects of polydispersity in optical microscopy experiments. ©2005 American Institute of Physics
History: Received 5 July 2005; accepted 23 August 2005; published 31 October 2005
Permalink: http://link.aip.org/link/?JCPSA6/123/174904/1
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0021-9606 (print)   1089-7690 (online)
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