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Issue 48, 2013
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Spherical polyelectrolyte brushes' constant zeta potential with varying ionic strength: an electrophoretic study using a hairy layer approach

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Abstract

The ζ-potential of spherical brushes of poly[2-(methacryloyloxy)ethyl]trimethylammonium chloride (PMETAC) and poly(potassium sulfopropyl methacrylate) (PSPM) was measured as a function of ionic strength. The ζ-potential of PMETAC brushes varies from +30 mV at 10 mM NaCl to +20 mV at 200 mM, and the ζ-potential of PSPM changes from −30 mV to −25 mV, at their respective ionic strengths. This unusual weak dependence of the ζ-potential on ionic strength is quantitatively explained on the basis of the responsiveness of brushes toward changes in the ionic strength as well as taking into account the specific hydrodynamics of the hairy brush solution interface. The electric potential distribution is described in the framework of the Debye–Hückel approximation. An analytical equation describing the dependence of the ζ-potential of polyelectrolyte brushes on ionic strength is provided.

Graphical abstract: Spherical polyelectrolyte brushes' constant zeta potential with varying ionic strength: an electrophoretic study using a hairy layer approach

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Publication details

The article was received on 13 May 2013, accepted on 08 Oct 2013 and first published on 11 Oct 2013


Article type: Paper
DOI: 10.1039/C3SM51343B
Citation: Soft Matter, 2013,9, 11609-11617
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    Spherical polyelectrolyte brushes' constant zeta potential with varying ionic strength: an electrophoretic study using a hairy layer approach

    J. Irigoyen, V. B. Arekalyan, Z. Navoyan, J. Iturri, S. E. Moya and E. Donath, Soft Matter, 2013, 9, 11609
    DOI: 10.1039/C3SM51343B

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