56 Citations (Scopus)

Abstract

A colloidal suspension is a heterogeneous fluid containing solid microscopic particles. Colloids play an important role in our everyday life, from food and pharmaceutical industries to medicine and nontechnology. It is useful to distinguish two major classes of colloidal suspensions: 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, active colloids pose a formidable challenge, and the research is in its early exploratory stage. One of the most remarkable properties of active colloids is the possibility of dynamic self-assembly, a natural tendency of simple building blocks to organize into complex functional architectures. Examples range from tunable, self-healing colloidal crystals and membranes to self-assembled microswimmers and robots. Active colloidal suspensions may exhibit material properties not present in their equilibrium counterparts, e.g., reduced viscosity and enhanced self-diffusivity, etc. This study surveys the most recent developments in the physics of active colloids, both in synthetic and living systems, with the aim of elucidation of the fundamental physical mechanisms governing self-assembly and collective behavior.

Original languageEnglish (US)
Pages (from-to)79-92
Number of pages14
JournalPhysics-Uspekhi
Volume56
Issue number1
DOIs
StatePublished - Apr 29 2013

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colloids
self assembly
healing
thermodynamic equilibrium
robots
medicine
food
shear flow
diffusivity
chemical reactions
tendencies
industries
hydrodynamics
viscosity
membranes
physics
electric fields
fluids
magnetic fields
crystals

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)

Cite this

Aranson, I. S. / Active colloids. In: Physics-Uspekhi. 2013 ; Vol. 56, No. 1. pp. 79-92.
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Active colloids. / Aranson, I. S.

In: Physics-Uspekhi, Vol. 56, No. 1, 29.04.2013, p. 79-92.

Research output: Contribution to journalArticle

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