Critical length of nanowires for hydrophobic behavior

Yu Hung Cheng, Chung Kuang Chou, Chih Chen, Syh Yuh Cheng

Research output: Contribution to journalArticlepeer-review

31 Scopus citations


This Letter investigates the wetting behavior on surface with well-controlled nanoscale structure. Water and water-alcohol droplets were brought to contact the surface electroplated by Ag nanowires. It is found that hydrophobic behavior becomes more pronounced as the length of the nanowires increases. A critical length of approximately 100 nm is observed, beyond which the contact angle approaches a steady value of 130°. In addition, the contact angle of water levels off around 160° when the length of the fluorine-coated Ag nanowires exceeds the critical value of 100 nm. The mechanism of the hydrophobic behavior on surface with nanoscale structure is proposed.

Original languageEnglish
Pages (from-to)17-20
Number of pages4
JournalChemical Physics Letters
Issue number1-3
StatePublished - 11 Oct 2004

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