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Electrophoretic mobility and charge inversion of a colloidal particle studied by single-colloid electrophoresis and molecular dynamics simulations

Ilya Semenov1, Shervin Raafatnia2, Marcello Sega2,*, Vladimir Lobaskin3, Christian Holm2, and Friedrich Kremer1

  • 1Institute of Experimental Physics I, Leipzig University, Linnéstrasse 5, D-04103 Leipzig, Germany
  • 2Institute for Computational Physics, Stuttgart University, Allmandring 3, D-70569 Stuttgart, Germany
  • 3School of Physics and Complex and Adaptive Systems Laboratory, University College Dublin, Belfield, Dublin 4, Ireland

  • *Present address: Department of Physics, Tor Vergata University of Rome, via della ricerca scientifica 1, I-00133 Rome, Italy.
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Phys. Rev. E 87, 022302 – Published 4 February, 2013

DOI: https://doi.org/10.1103/PhysRevE.87.022302

Abstract

Optical Tweezers are employed to study the electrophoretic and the electroosmotic motion of a single colloid immersed in electrolyte solutions of ion concentrations between 10−5 and 1 mol/l and of different valencies (KCl, CaCl2, LaCl3). The measured particle mobility in monovalent salt is found to be in agreement with computations combining primitive model molecular dynamics simulations of the ionic double layer with the standard electrokinetic model. Mobility reversal of a single colloid—for the first time—is observed in the presence of trivalent ions (LaCl3) at ionic strengths larger than 10−2 mol/l. In this case, our numerical model is in a quantitative agreement with the experiment only when ion specific attractive forces are added to the primitive model, demonstrating that at low colloidal charge densities, ion correlation effects alone do not suffice to produce mobility reversal.

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Phys. Rev. E 87, 022302– Published 4 February, 2013
  • Received 3 April 2012

©2013 American Physical Society

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