Comptes Rendus
Living fluids/Fluides vivants
Collective behavior in out-of-equilibrium colloidal suspensions
[Comportement collectif de suspensions colloïdales hors équilibre]
Comptes Rendus. Physique, Volume 14 (2013) no. 6, pp. 518-527.

Une suspension colloïdale est un liquide hétérogène contenant des particules solides microscopiques. Les colloïdes jouent un rôle important dans notre vie quotidienne, des industries alimentaires et pharmaceutiques à la médecine et aux nanotechnologies. Il est pratique de distinguer deux classes majeures de suspensions colloïdales : à lʼéquilibre, et active, cʼest-à-dire maintenue en dehors de lʼéquilibre thermodynamique par des champs électriques ou magnétiques externes, de la lumière, des réactions chimiques, ou un flux de cisaillement hydrodynamique. Alors que les propriétés des suspensions colloïdales à lʼéquilibre sont assez bien comprises, les colloïdes actifs constituent un formidable défi, et la recherche en est encore à lʼetape exploratoire. Une des propriétés les plus remarquables des colloïdes actifs est la possibilité dʼauto-assemblage dynamique, une tendance naturelle des composants simples à sʼorganiser dans des architectures fonctionnelles complexes. Les exemples sʼétendent des cristaux et membranes colloïdaux modifiables et auto-réparables aux micro-nageurs et robots auto-assemblés. Les suspensions colloïdales actives peuvent montrer des propriétés matérielles qui ne sont pas présentes dans leurs homologues à lʼéquilibre, comme, par exemple, une viscosité réduite, une auto-diffusivité augmentée, etc. Ce travail examine les développements les plus récents dans le domaine de la physique des colloïdes actifs, dans le but dʼélucider les mécanismes de physique fondamentale régissant lʼauto-assemblage et le comportement collectif.

Colloidal suspensions, heterogeneous fluids containing solid microscopic particles, play an important role in our everyday life, from food and pharmaceutical industries to medicine and nanotechnology. Colloidal suspensions can be divided in two major classes: equilibrium, and active, i.e. maintained out of thermodynamic equilibrium by external electric or magnetic fields, light, chemical reactions, or hydrodynamic shear flow. While the properties of equilibrium colloidal suspensions are fairly well understood, out-of-equilibrium colloids pose a formidable challenge and the research is in its early exploratory stage. The possibility of dynamic self-assembly, a natural tendency of simple building blocks to organize into complex functional architectures, is one of the most remarkable properties of out-of-equilibrium colloids. Examples range from tunable, self-healing colloidal crystals and membranes to self-assembled microswimmers and robots. In contrast to their equilibrium counterparts, out-of-equilibrium colloidal suspensions may exhibit novel material properties, e.g. reduced viscosity, enhanced self-diffusivity, etc. This work reviews recent developments in the field of self-assembly and collective behavior of out-of-equilibrium colloids, with the focus on the fundamental physical mechanisms.

Publié le :
DOI : 10.1016/j.crhy.2013.05.002
Keywords: Colloids, Self-assembly, Collective behavior
Mot clés : Colloïdes, Auto-assemblage, Comportement collectif

Igor S. Aranson 1, 2

1 Materials Science Division, Argonne National Laboratory, 9700 South Cass Avenue, Argonne, IL 60439, USA
2 Department of Engineering Sciences and Applied Mathematics, Northwestern University, 2145 Sheridan Rd, Evanston, IL 60208, USA
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Igor S. Aranson. Collective behavior in out-of-equilibrium colloidal suspensions. Comptes Rendus. Physique, Volume 14 (2013) no. 6, pp. 518-527. doi : 10.1016/j.crhy.2013.05.002. https://comptes-rendus.academie-sciences.fr/physique/articles/10.1016/j.crhy.2013.05.002/

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