Papers › Controlled Optofluidic Crystallization of Colloids Tethered at Interfaces
Controlled Optofluidic Crystallization of Colloids Tethered at Interfaces
Alessio Caciagli, Rajesh Singh, Darshana Joshi, R. Adhikari, Erika Eiser
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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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