Light-Induced Dynamic Control of Particle Motion in Fluid-Filled Microchannels

Joshua E. Kauffman, Abhrajit Laskar, Oleg E. Shklyaev, Anna C. Balazs, Ayusman Sen

Research output: Contribution to journalArticlepeer-review

Abstract

The design of remotely programmable microfluidic systems with controlled fluid flow and particle transport is a significant challenge. Herein, we describe a system that harnesses the intrinsic thermal response of a fluid to spontaneously pump solutions and regulate the transport of immersed microparticles. Irradiating a silver-coated channel with ultraviolet (UV) light generates local convective vortexes, which, in addition to the externally imposed flow, can be used to guide particles along specific trajectories or to arrest their motion. The method provides the distinct advantage that the flow and the associated convective patterns can be dynamically altered by relocating the source of UV light. Moreover, the flow can be initiated and terminated "on-demand"by turning the light on or off.

Original languageEnglish (US)
Pages (from-to)10022-10032
Number of pages11
JournalLangmuir
Volume36
Issue number34
DOIs
StatePublished - Sep 1 2020

All Science Journal Classification (ASJC) codes

  • Materials Science(all)
  • Condensed Matter Physics
  • Surfaces and Interfaces
  • Spectroscopy
  • Electrochemistry

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