Dynamic clustering and re-dispersion in concentrated colloid-active gel composites.

Autor:	Foffano G; Laboratoire de Physique Théorique et Modèles Statistiques, Université Paris-Sud, UMR 8626, 91405 Orsay, France., Lintuvuori JS; Univ. Bordeaux, CNRS, LOMA, UMR 5798, F-33405 Talence, France., Stratford K; EPCC, School of Physics and Astronomy, Peter Guthrie Tait Road, Edinburgh EH9 3FD, UK., Cates ME; DAMTP, Centre for Mathematical Sciences, University of Cambridge, Cambridge CB3 0WA, UK., Marenduzzo D; SUPA, School of Physics and Astronomy, University of Edinburgh, James Clerk Maxwell Building, Peter Gutherie Tait Road, Edinburgh EH9 3FD, UK. dmarendu@ph.ed.ac.uk.
Jazyk:	angličtina
Zdroj:	Soft matter [Soft Matter] 2019 Sep 14; Vol. 15 (34), pp. 6896-6902. Date of Electronic Publication: 2019 Aug 19.
DOI:	10.1039/c9sm01249d
Abstrakt:	We study the dynamics of quasi-two-dimensional concentrated suspensions of colloidal particles in active gels by computer simulations. Remarkably, we find that activity induces a dynamic clustering of colloids even in the absence of any preferential anchoring of the active nematic director at the particle surface. When such an anchoring is present, active stresses instead compete with elastic forces and re-disperse the aggregates observed in passive colloid-liquid crystal composites. Our quasi-two-dimensional "inverse" dispersions of passive particles in active fluids (as opposed to the more common "direct" suspensions of active particles in passive fluids) provide a promising route towards the self-assembly of new soft materials.
Databáze:	MEDLINE
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