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http://dx.doi.org/10.3795/KSME-A.2007.31.6.679

Surface Wettability in Terms of Prominence and Depression of Diverse Microstructures and Their Sizes  

Ha, Seon-Woo (부산대학교 기계공학부)
Lee, Sang-Min (부산대학교 미세기계전자시스템협동과정)
Jeong, Im-Deok (부산대학교 미세기계전자시스템협동과정)
Jung, Phill-Gu (부산대학교 기계공학부)
Ko, Jong-Soo (부산대학교 기계공학부)
Publication Information
Transactions of the Korean Society of Mechanical Engineers A / v.31, no.6, 2007 , pp. 679-685 More about this Journal
Abstract
Superhydrophobic surface, with a water contact angle greater than $150^{\circ}$, has a self-cleaning effect termed 'Lotus effect'. This surface is created by the combination of rough surface and the low surface energy. We proposed square pillar and square shapes to control surface roughness. Microstructure arrays are fabricated by DRIE(Deep Reactive Ion Etching) process and followed by PPFC(Plasma Polymerized Fluorocarbon) deposition. On the experimental result, contact angle at square pillar arrays is well matched with Cassie's model and largest contact angle is $173.37^{\circ}$. But contact angle of square pore shape arrays is lower than Cassie's theoretical contact angle about $5{\sim}10%$. Nevertheless, square pore arrays have more rigidity than square pillar arrays.
Keywords
Superhydrophobic; Lotus effect; PPFC(Plasma Polymerized Fluorocarbon); Contact angle; DRIE;
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