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© Research
Publication : Physical review. E, Statistical, nonlinear, and soft matter physics

Thermocapillary valve for droplet production and sorting

Scientific Fields
Diseases
Organisms
Applications
Technique

Published in Physical review. E, Statistical, nonlinear, and soft matter physics - 05 Apr 2007

Baroud CN, Delville JP, Gallaire F, Wunenburger R

Link to Pubmed [PMID] – 17500988

Phys Rev E Stat Nonlin Soft Matter Phys 2007 Apr;75(4 Pt 2):046302

Droplets are natural candidates for use as microfluidic reactors, if active control of their formation and transport can be achieved. We show here that localized heating from a laser can block the motion of a water-oil interface, acting as a microfluidic valve for two-phase flows. A theoretical model is developed to explain the forces acting on a drop due to thermocapillary flow, predicting a scaling law that favors miniaturization. Finally, we show how the laser forcing can be applied to sorting drops, thus demonstrating how it may be integrated in complex droplet microfluidic systems.

https://www.ncbi.nlm.nih.gov/pubmed/17500988