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

Joseba Irigoyen; Valeri B. Arekalyan; Zaven Navoyan; Jagoba Iturri; Sergio E. Moya; Edwin Donath

doi:10.1039/C3SM51343B

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

Joseba Irigoyen,^a Valeri B. Arekalyan,*^b Zaven Navoyan,^b Jagoba Iturri,^a Sergio E. Moya*^ac and Edwin Donath^d

* Corresponding authors

^a CIC biomaGUNE, Parque Tecnológico de San Sebastián, Paseo Miramón 182 C, 20009 San Sebastián, Spain
E-mail: smoya@cicbiomagune.es

^b Department of Molecular Physics, Yerevan State University, 1 Alex Manoogian, Yerevan, Armenia
E-mail: arakelv@mail.yerphi.am

^c Department of Polymer Science and Engineering, Zhejiang University, Hangzhou 310027, China

^d Institute Of Medical Physics and Biophysics, University of Leipzig, Härtelstraße 16-18, 04107 Leipzig, Germany

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.

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DOI: https://doi.org/10.1039/C3SM51343B
Article type: Paper
Submitted: 13 May 2013
Accepted: 08 Oct 2013
First published: 11 Oct 2013

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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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Soft Matter

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

Abstract

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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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