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http://dx.doi.org/10.7736/KSPE.2015.32.6.577

Experimental Study of Dynamic Behavior of a Water Droplet on Diverse Wrinkling Surfaces  

Baek, Dae Hyeon (Graduate School of Mechanical Engineering, Pusan National University)
Zhao, Zhijun (Graduate School of Mechanical Engineering, Pusan National University)
Park, Sang-Hu (School of Mechanical Engineering, ERC/NSDM, Pusan National University)
Publication Information
Journal of the Korean Society for Precision Engineering / v.32, no.6, 2015 , pp. 577-585 More about this Journal
Abstract
We fabricated multi-scale such as macro-, micro-, and multi-scale wrinkles by using repetitive volume dividing (RVD) method and thermal curing process. Also wrinkle surface was modified with coating of a self-assembled monolayer (SAM). We measured the contact angle of each wrinkled surface, and observed the behavior of droplets on sloping surface. Through experimental study, we found out that the contact angle was much higher in case of multi-scale and SAM coated wrinkles. And micro-scale wrinkle showed a high contact angle comparing with that of macro-scale wrinkle. Dynamic behaviors of a water droplet like sliding velocity on diverse wrinkled surfaces were dependent on their static contact angles. These results showed that hydro-dynamic characteristics were changed depending on the wrinkle structure and the material forming the wrinkle. These dynamic characteristics can be utilized in bio-chip, microfluidics, and many others in order to control easily chemical reactivity.
Keywords
Micro-scale wrinkles; Hydro-dynamic characteristics; Reactivity control; Surface wrinkles;
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Times Cited By KSCI : 1  (Citation Analysis)
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