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Issue 47, 2016
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Dielectric effects on the ion distribution near a Janus colloid

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Abstract

Spherical Janus colloids, particles with different surface properties on their two hemispheres, are generally heterogeneous in permittivity. This dielectric heterogeneity may affect their behavior in electrolytes and external electric fields, but is typically not taken into account in computational studies. We apply the iterative dielectric solver developed by Barros and Luijten [Phys. Rev. Lett., 2014, 113, 017801] in combination with preconditioning techniques that can accurately and efficiently compute the polarization of dielectrically anisotropic particles. Employing this approach, we systematically study the ion distribution around neutral and charged Janus particles with various permittivities, immersed in symmetric and asymmetric electrolytes. We demonstrate that neutral Janus colloids may carry a nonzero dipole moment in asymmetric salts. For charged Janus colloids, dielectric effects can substantially influence the electric double layer. These findings also have implications for other dielectrically anisotropic entities, such as proteins.

Graphical abstract: Dielectric effects on the ion distribution near a Janus colloid

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Publication details

The article was received on 22 Jul 2016, accepted on 18 Oct 2016 and first published on 18 Oct 2016


Article type: Paper
DOI: 10.1039/C6SM01675H
Citation: Soft Matter, 2016,12, 9575-9584
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    Dielectric effects on the ion distribution near a Janus colloid

    H. Wu, M. Han and E. Luijten, Soft Matter, 2016, 12, 9575
    DOI: 10.1039/C6SM01675H

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