The movement of a water droplet on a gradient surface prepared by photodegradation

Yoshihiro Ito, Mojgan Heydari, Ayako Hashimoto, Tomohiro Konno, Ayaka Hirasawa, Satomi Hori, Kimio Kurita, Akira Nakajima

Research output: Contribution to journalArticlepeer-review

162 Citations (Scopus)


A hydrophobic to hydrophilic gradient surface was prepared using the tuned photodegradation of an alkylsilane self-assembled monolayer (SAM) using irradiation of vacuum ultraviolet light (wavelength = 172 nm). The water contact angle on the photodegraded SAM surface was adjusted using the intensity and time photoirradiation parameters. The formation of a gradient was confirmed by fluorescent labeling. The water drop moved from the hydrophobic to hydrophilic surface with a velocity that depended on the gradient. The higher the gradient, the faster the water moved. For the first time, we have prepared a gradient surface using photodegradation where the movement of a water drop was regulated by the degree of gradation. Considering that the photodegradation technique can be applied to various surfaces and to lithography, this technique will be useful for various material surfaces.

Original languageEnglish
Pages (from-to)1845-1850
Number of pages6
Issue number4
Publication statusPublished - 2007 Feb 13


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