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Annual Review of Chemical and Biomolecular Engineering

Volume 14, 2023

Active Colloids as Models, Materials, and Machines

Abstract

Active colloids use energy input at the particle level to propel persistent motion and direct dynamic assemblies. We consider three types of colloids animated by chemical reactions, time-varying magnetic fields, and electric currents. For each type, we review the basic propulsion mechanisms at the particle level and discuss their consequences for collective behaviors in particle ensembles. These microscopic systems provide useful experimental models of nonequilibrium many-body physics in which dissipative currents break time-reversal symmetry. Freed from the constraints of thermodynamic equilibrium, active colloids assemble to form materials that move, reconfigure, heal, and adapt. Colloidal machines based on engineered particles and their assemblies provide a basis for mobile robots with increasing levels of autonomy. This review provides a conceptual framework for understanding and applying active colloids to create material systems that mimic the functions of living matter. We highlight opportunities for chemical engineers to contribute to this growing field.

Keyword(s): active matter, colloidal assemblies, nonequilibrium, self-propelled
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/content/journals/10.1146/annurev-chembioeng-101121-084939
2023-06-08
2024-05-05
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Active Colloids as Models, Materials, and Machines
Annual Review of Chemical and Biomolecular Engineering 14, 1 (2023); https://doi.org/10.1146/annurev-chembioeng-101121-084939
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