Document Detail


Pinned films and capillary hysteresis in microfluidic channels.
MedLine Citation:
PMID:  22678463     Owner:  NLM     Status:  Publisher    
Abstract/OtherAbstract:
Pinned water films in a microfluidic channel act as elastic membranes under tension that increase capillary pressures while preserving the mechanical work dissipated around capillary pressure-saturation, P(c)-S(w), hysteresis cycles. High-resolution two-photon laser micromachining of SU-8 photoresist was used to fabricate wedge-shaped microfluidic channels that included sharp edge features to pin wetting films during drainage. The films were measured using confocal fluorescence microscopy. The tension in the film acts as an elastic tether that shifts the P(c)-S(w) hysteresis cycle higher in pressure relative to the hysteresis cycle in the same sample when films are not pinned. The film tension is strongly nonlinear as the restoring force decreases with increasing displacement. The contribution of elastic forces to hysteresis has important consequences for pressure and saturation control in microfluidics.
Authors:
Yihong Liu; David D Nolte; Laura J Pyrak-Nolte
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Publication Detail:
Type:  JOURNAL ARTICLE     Date:  2012-6-7
Journal Detail:
Title:  Lab on a chip     Volume:  -     ISSN:  1473-0189     ISO Abbreviation:  -     Publication Date:  2012 Jun 
Date Detail:
Created Date:  2012-6-8     Completed Date:  -     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  101128948     Medline TA:  Lab Chip     Country:  -    
Other Details:
Languages:  ENG     Pagination:  -     Citation Subset:  -    
Affiliation:
Department of Physics, Purdue University, 525 Northwestern Avenue, West Lafayette, Indiana, USA. ljpn@purdue.edu.
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