One-way wicking in open micro-channels controlled by channel topography

Feng, J. S. and Rothstein, J. P.. (2013) One-way wicking in open micro-channels controlled by channel topography. Journal of Colloid and Interface Science, 404. pp. 169-178.

Full text not available from this repository.


One-way wicking (microfluidic diode) behaviors of a range of IPA-water mixtures on internally structured PDMS-based open micro-channels were experimentally demonstrated and quantified. The open microfluidic channels, each internally decorated with an array of angled fin-like-structure pairs, were fabricated using a combined photolithography and soft molding procedure. Propagations of wetting fluids were found to be much more impeded on the fin-tilting direction, or the hard wicking direction, comparing to the opposite direction, or the easy wicking direction. This asymmetric wicking behaviors were attributed to the structure-induced direction-dependent Laplace pressure. Two key parameters - the contact angle of the wicking fluid and the tilting angle of the fin-like structures - were studied. The effects of preferential evaporation and wetting instability were also investigated. The findings of this study are expected to provide a better understanding of how fluids interact with micro-scaled structures and to offer a new way of manipulating fluids at the micron and nanometer stales. (C) 2013 Elsevier Inc. All rights reserved.

Item Type: Article
Additional Information: ISI Document Delivery No.: 168VWTimes Cited: 0Cited Reference Count: 26Feng, Jiansheng Rothstein, Jonathan P.National Science Foundation's Center for Hierarchical Manufacturing at the University of Massachusetts Amherst CMMI-1025020The authors gratefully acknowledge the funding from the National Science Foundation's Center for Hierarchical Manufacturing (Grant No. CMMI-1025020) at the University of Massachusetts Amherst. The authors would also like to acknowledge Professor Mark T. Tuominen for the helpful discussions.Academic press inc elsevier scienceSan diego
Uncontrolled Keywords: valves
Collections: Nanomanufacturing Research Collection > Nanomanufacturing Nanoscale Science and Engineering Centers > Center for Hierarchical Manufacturing
Depositing User: Robert Stevens
Date Deposited: 27 Mar 2014
Last Modified: 27 Mar 2014 20:21

Actions (login required)

View Item View Item