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000151478 1001_ $$0P:(DE-Juel1)130616$$aDhont, Jan K.G.$$b0$$eCorresponding author$$ufzj
000151478 245__ $$aAn electric-field induced dynamical state in dispersions of charged colloidal rods
000151478 260__ $$aCambridge$$bRoyal Society of Chemistry (RSC)$$c2014
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000151478 520__ $$aThe response of concentrated dispersions of charged colloids to low-frequency electric fields is governed by field-induced inter-colloidal interactions resulting from the polarization of electric double layers and the layer of condensed ions, association and dissociation of condensed ions, as well as hydrodynamic interactions through field-induced electro-osmotic flow. The phases and states that can be formed by such field-induced interactions are an essentially unexplored field of research. Experiments on concentrated suspensions of rod-like colloids (fd-virus particles), within the isotropic–nematic phase coexistence region, showed that a number of phases/states are induced, depending on the field amplitude and frequency [Soft Matter, 2010, 6, 273]. In particular, a dynamical state is found where nematic domains form and melt on a time scale of the order of seconds. We discuss the microscopic origin of this dynamical state, which is attributed to the cyclic, electric-field induced dissociation and association of condensed ions. A semi-quantitative theory is presented for the dynamics of melting and formation of nematic domains, including a model for the field-induced dissociation/association of condensed ions. The resulting equation of motion for the orientational order parameter is solved numerically for parameters complying with the fd-virus system. A limit-cycle is found, with a cycling-time that diverges at the transition line in the field-amplitude versus frequency plane where the dynamical state first appears, in accord with experimental findings.
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000151478 7001_ $$0P:(DE-Juel1)130749$$aKang, Kyongok$$b1
000151478 773__ $$0PERI:(DE-600)2191476-X$$a10.1039/c3sm52277f$$gVol. 10, no. 12, p. 1987 -$$n12$$p1987-2007$$tSoft matter$$v10$$x1744-6848$$y2014
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