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Controlled Optofluidic Crystallization of Colloids Tethered at Interfaces.

Authors
  • Caciagli, Alessio
  • Singh, Rajesh
  • Joshi, Darshana
  • Adhikari, R
  • Eiser, Erika
Publication Date
Aug 07, 2020
Source
Apollo - University of Cambridge Repository
Keywords
Language
English
License
Unknown
External links

Abstract

We report experiments that show rapid crystallization of colloids tethered to an oil-water interface in response to laser illumination. This light-induced transition is due to a combination of long-ranged thermophoretic pumping and local optical binding. We show that the flow-induced force on the colloids can be described as the gradient of a potential. The nonequilibrium steady state due to local heating thus admits an effective equilibrium description. The optofluidic manipulation explored in this work opens novel ways to manipulate and assemble colloidal particles.

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