Conductivity maximum in a charged colloidal suspension

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Molecular dynamics simulations of a charged colloidal suspension in the salt-free regime show that the system exhibits an electrical conductivity maximum as a function of colloid charge. We attribute this behavior to two main competing effects: colloid effective charge saturation due to counterion 'condensation' and diffusion slowdown due to the relaxation effect. In agreement with previous observations, we also find that the effective transported charge is larger than the one determined by the Stern layer and suggest that it corresponds to the boundary fluid layer at the surface of the colloidal particles.

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Bastea, S January 27, 2009.

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Molecular dynamics simulations of a charged colloidal suspension in the salt-free regime show that the system exhibits an electrical conductivity maximum as a function of colloid charge. We attribute this behavior to two main competing effects: colloid effective charge saturation due to counterion 'condensation' and diffusion slowdown due to the relaxation effect. In agreement with previous observations, we also find that the effective transported charge is larger than the one determined by the Stern layer and suggest that it corresponds to the boundary fluid layer at the surface of the colloidal particles.

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PDF-file: 14 pages; size: 0.1 Mbytes

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  • Journal Name: Soft Matter, vol. 6, no. 17, June 30, 2010, pp. 4223; Journal Volume: 6; Journal Issue: 17

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  • Report No.: LLNL-JRNL-410170
  • Grant Number: W-7405-ENG-48
  • Office of Scientific & Technical Information Report Number: 1020333
  • Archival Resource Key: ark:/67531/metadc832834

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  • January 27, 2009

Added to The UNT Digital Library

  • May 19, 2016, 3:16 p.m.

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  • Dec. 8, 2016, 3:06 p.m.

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Bastea, S. Conductivity maximum in a charged colloidal suspension, article, January 27, 2009; Livermore, California. (digital.library.unt.edu/ark:/67531/metadc832834/: accessed August 21, 2018), University of North Texas Libraries, Digital Library, digital.library.unt.edu; crediting UNT Libraries Government Documents Department.