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http://dx.doi.org/10.3795/KSME-A.2014.38.8.823

Modeling of Capillary Filling Length in Silwet L-77 Added Poly(Dimethylsiloxane) (PDMS) Microchannels  

Lee, Bom-Yee (School of Mechanical Engineering, Chonnam Nat'l Univ.)
Lee, Bong-Kee (School of Mechanical Engineering, Chonnam Nat'l Univ.)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.38, no.8, 2014 , pp. 823-829 More about this Journal
Abstract
In the present study, simple models were proposed to predict the capillary-driven flow length in a surfactant-added poly(dimethylsiloxane) (PDMS) rectangular microchannel. Owing to the hydrophobic nature of PDMS, it is difficult to transport water in a conventional PDMS microchannel by means of the capillary force alone. To overcome this problem, microchannels with a hydrophilic surface were fabricated using surfactant-added PDMS. By measuring the contact angle change on the surfactant-added PDMS surface, the behavior was investigated to establish a simple model. In order to predict the filling length induced by the capillary force, the Washburn equation was modified in the present study. From the investigation, it was found that the initial rate-of-change of the contact angle affected the filling length. Simple models were developed for three representative cases, and these can be useful tools in designing microfluidic manufacturing techniques including MIcroMolding In Capillaries (MIMIC).
Keywords
Capillary Force; Poly(dimethylsiloxane)(PDMS); Surfactant; Rectangular Microchannel;
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Times Cited By KSCI : 1  (Citation Analysis)
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