Aqueous droplet manipulation by optically induced Marangoni circulation
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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.
KeywordsMarangoni force Thermocapillary flow Droplet manipulation
This project is funding in part by the National Science Foundation, grant number EEC09-26632. The authors would like to thank Dr. Yi Zuo for assistance with surface tension measurements.
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