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Issue 40, 2018
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Colloidal electro-phoresis in the presence of symmetric and asymmetric electro-osmotic flow

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Abstract

We characterize the electro-phoretic motion of charged sphere suspensions in the presence of substantial electro-osmotic flow using a recently introduced small angle super-heterodyne dynamic light scattering instrument (ISASH-LDV). Operation in integral mode gives access to the particle velocity distribution over the complete cell cross-section. Obtained Doppler spectra are evaluated for electro-phoretic mobility, wall electro-osmotic mobility and particle diffusion coefficient. Simultaneous measurements of differing electro-osmotic mobilities leading to asymmetric solvent flow are demonstrated in a custom made electro-kinetic cell fitting standard microscopy slides as exchangeable sidewalls. The scope and range of our approach are discussed demonstrating the possibility of an internal calibration standard and using the simultaneously measured electro-kinetic mobilities in the interpretation of a microfluidic pumping experiment involving an inhomogeneous electric field and a complex solvent flow pattern.

Graphical abstract: Colloidal electro-phoresis in the presence of symmetric and asymmetric electro-osmotic flow

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Publication details

The article was received on 07 May 2018, accepted on 19 Sep 2018 and first published on 25 Sep 2018


Article type: Paper
DOI: 10.1039/C8SM00934A
Citation: Soft Matter, 2018,14, 8191-8204
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    Colloidal electro-phoresis in the presence of symmetric and asymmetric electro-osmotic flow

    D. Botin, J. Wenzl, R. Niu and T. Palberg, Soft Matter, 2018, 14, 8191
    DOI: 10.1039/C8SM00934A

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