Research Paper

Microfluidics and Nanofluidics

, Volume 11, Issue 3, pp 307-316

First online:

Aqueous droplet manipulation by optically induced Marangoni circulation

  • Wenqi HuAffiliated withDepartment of Electrical Engineering, University of Hawaii at Manoa
  • , Aaron T. OhtaAffiliated withDepartment of Electrical Engineering, University of Hawaii at Manoa Email author 

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Abstract

The manipulation of picoliter droplets is demonstrated using optically induced microscale circulatory flows. The circulation results from Marangoni effects induced by optical heating from light patterns created by a computer projector. Manipulation of single droplets and parallel manipulation of multiple droplets are achieved with induced forces of up to 1 nN and an average resolution of 146.5 μm.

Keywords

Marangoni force Thermocapillary flow Droplet manipulation