Facile manipulation of receding contact angles of a substrate by roughening and fluorination

Yueh Feng Li, Cyuan Jhang Wu, Yu Jane Sheng, Heng Kwong Tsao

研究成果: 雜誌貢獻期刊論文同行評審

9 引文 斯高帕斯(Scopus)

摘要

Contact angle hysteresis plays a paramount role in anti-smudge surfaces. In this study, surface roughness is systematically altered on some polymeric substrates such as polystyrene and poly(methyl methacrylate) by roughening and its effect on contact angle hysteresis is investigated via measuring advancing and receding contact angles of water. The wettability on these substrates is also modified by vapor-phase deposition of perfluorooctyltrichlorosilane, while the surface morphology is kept the same. As surface roughness is increased, the advancing contact angle grows but three types of the receding contact angle (θ r ) behavior have been identified: (i) monotonic reduction of θ r , (ii) monotonic enhancement of θ r , and (iii) presence of a minimum of θ r . A plausible mechanism based on the stability of air pockets is proposed to explain our experimental findings. The manipulation of receding contact angles can be achieved based on our findings.

原文???core.languages.en_GB???
頁(從 - 到)127-132
頁數6
期刊Applied Surface Science
355
DOIs
出版狀態已出版 - 15 11月 2015

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