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Nonvolatile Liquid-Film-Embedded Microfluidic Valve for Microscopic Evaporation Control Without Stiction Problem at Liquid–Air Interfaces

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2 Author(s)
Almeida, R. ; Univ. of Missouri, Columbia, MO, USA ; Jae Wan Kwon

A critical problem of quick evaporation speed of fluids in the microscopic scale can cause many unexpected results and failures. Here, we introduce evaporation speed controlling effects of a thin liquid-film-based microfluidic valve in a microfluidic droplet ejector. The thin liquid film with nonvolatility and immiscibility exhibited an excellent microfluidic valve function without any stiction problem between valve components and provided a very effective evaporation protection barrier for the microfluids in the device. We have investigated its effectiveness for evaporation control at a microfluidic port with a liquid-air interface. Successful evaporation control by the liquid-film-embedded microfluidic valve has been demonstrated. We believe that this novel approach has immense potential in many microfluidic devices requiring a high level of evaporation control.

Published in:

Microelectromechanical Systems, Journal of  (Volume:21 ,  Issue: 4 )

Date of Publication:

Aug. 2012

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