Portal de Periódicos da CAPES

A superhydrophobic dual-scale engineered lotus leaf

2007; IOP Publishing; Volume: 18; Issue: 1 Linguagem: Inglês

10.1088/0960-1317/18/1/015019

1361-6439

Donghyun Kim, Joonwon Kim, Hyun C. Park, Kun-H Lee, Woonbong Hwang,

Icing and De-icing Technologies

A surface was created with the same superhydrophobic property as the lotus leaf (lotus effect) by dipping of sandblasted porous alumina into polytetrafluoroethylene (PTFE, Teflon®: DuPont™) solution. The fabricated engineered lotus leaf had PTFE dual-scale structures. This fabrication process has several advantages, including low fabrication cost, simplicity and easy coverage of a large area. The sandblasted porous alumina template was fabricated by sandblasting of an aluminum sheet and anodization in oxalic acid. To obtain PTFE dual-scale structures, PTFE replication based on the dipping method was used, with a 0.3 w% PTFE solution. To remove the aluminum and alumina layers, wet etching by chromic and phosphoric acid mixed solution and liquid HgCl2 solution was used. The fabricated surface has a superhydrophobic property whose apparent contact angle of the PTFE dual-scale structures was approximately 165° and sliding angle is less than 2°.