Electric-field-induced polarization of the layer of condensed ions on cylindrical colloids

Dhont, J.K.G.; Kang, K.

doi:10.1140/epje/i2011-11040-9

Journal Article

PreJuSER-15127

Electric-field-induced polarization of the layer of condensed ions on cylindrical colloids

Dhont, J. K. G.FZJ* ; Kang, K.FZJ*

2011
Springer Berlin

The European physical journal / E 34, 40 (2011) [10.1140/epje/i2011-11040-9]

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Please use a persistent id in citations: http://hdl.handle.net/2128/4610 doi:10.1140/epje/i2011-11040-9

Abstract: In concentrated suspensions of charged colloids, interactions between colloids can be induced by an external electric field through the polarization of charge distributions (within the diffusive double layer and the layer of condensed ions) and/or electro-osmotic flow. In case of rod-like colloids, these field-induced inter-colloidal interactions have recently been shown to lead to anomalous orientation perpendicular to the external field, and to phase/state transitions and dynamical states, depending on the field amplitude and frequency of the external field. As a first step towards a (semi-) quantitative understanding of these phenomena, we present a linear-response analysis of the frequency-dependent polarization of the layer of condensed ions on a single, long and thin cylindrical colloid. The in-phase and out-phase response functions for the charge distribution and the electric potential are calculated for arbitrary orientation of the cylindrical colloid. The frequency-dependent degree of alignment, which is proportional to the electric-field-induced birefringence, is calculated as well, and compared to experiments on dilute fd virus suspensions.

Keyword(s): Algorithms (MeSH) ; Colloids: chemistry (MeSH) ; Electricity (MeSH) ; Electrochemistry: methods (MeSH) ; Electrolytes (MeSH) ; Ions (MeSH) ; Materials Testing (MeSH) ; Models, Chemical (MeSH) ; Models, Statistical (MeSH) ; Particle Size (MeSH) ; Physics: methods (MeSH) ; Surface Properties (MeSH) ; Suspensions (MeSH) ; Colloids ; Electrolytes ; Ions ; Suspensions ; J

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Note: This work has significantly benefitted from many discussions with Prof. G.S. Manning. Part of this research was supported by the Trans-regio SFB 6018 "Physics of Colloidal Dispersions in External Fields" and by the EU-FP7 Network "NanoDirect" (contract number CP-FP-213948-2).

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