Evaporation of Water Droplets on “Lock-and-Key” Structures with Nanoscale Features

Xiaolong Zhu, Chi Zhang, Xiaohan Liu, Ole Hansen, Sanshui Xiao, N. Asger Mortensen, Jian Zi

Research output: Contribution to journalJournal articleResearchpeer-review

Abstract

Highly ordered poly(dimethylsiloxane) microbowl arrays (MBAs) and microcap arrays (MCAs) with “lock-and-key” properties are successfully fabricated by self-assembly and electrochemical deposition. The wetting properties and evaporation dynamics of water droplets for both cases have been investigated. For the MBAs case, the wetting radius of the droplets remains unchanged until the portion of the droplet completely dries out at the end of the evaporation process. The pinning state extends for more than 99.5% of the total evaporation time, and the pinning–shrinking transition is essentially prevented whereas in the case of the MCAs the contact radius exhibits distinct stages during evaporation and the contact line retreats significantly in the middle of the evaporation process. We explain the phenomenon by a qualitative energy balance argument based on the different shrinkage types of the nanoscale-folded contact line.
Original languageEnglish
JournalLangmuir
Volume28
Issue number25
Pages (from-to)9201–9205
ISSN0743-7463
DOIs
Publication statusPublished - 2012

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