Journal article
Evaporation of Water Droplets on “Lock-and-Key” Structures with Nanoscale Features
Department of Photonics Engineering, Technical University of Denmark1
Structured Electromagnetic Materials, Department of Photonics Engineering, Technical University of Denmark2
Fudan University3
Surface Physics and Catalysis, Department of Physics, Technical University of Denmark4
Department of Micro- and Nanotechnology, Technical University of Denmark5
Silicon Microtechnology, Department of Micro- and Nanotechnology, Technical University of Denmark6
Center for Individual Nanoparticle Functionality, Centers, Technical University of Denmark7
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.
| Language: | English |
|---|---|
| Year: | 2012 |
| Pages: | 9201-9205 |
| ISSN: | 15205827 and 07437463 |
| Types: | Journal article |
| DOI: | 10.1021/la301867q |
| ORCIDs: | Zhu, Xiaolong , Hansen, Ole , Xiao, Sanshui and Mortensen, N. Asger |
