writer：Peng Ge, Shuli Wang, Wendong Liu, Tieqiang Wang, Nianzuo Yu, Shunsheng Ye, Huaizhong Shen, Yuxin
keywords：none
source：期刊
specific source：Langmuir
Issue time：2017年

e report the unidirectional wetting behavior of liquids

(water and oil) on Janus silicon cylinder arrays (Si-CAs) under various

media (air, water, and oil). The Janus cylinders were prepared by

chemical modi?cation of nanocylinders with di?erent molecules on two

sides. Through adjusting surface energies of the modi?ed molecules, the

as-prepared surfaces could control the wetting behavior of di?erent types

of liquids under various media. We discuss the regularity systematically

and propose a strategy for preparing anisotropic wetting surfaces under

arbitrary media. That is, to ?nd two surface modi?cation molecules with

di?erent surface energies, one of the molecules is easy to be wetted by

the liquid under the corresponding media, while the other one is di?cult.

Additionally, by introducing thermal-responsive polymer brushes onto

one part of Janus Si-CAs, the surfaces show thermal-responsive

anisotropic wetting property under various media. We believe that due

to the excellent unidirectional wettability under various media, the Janus surfaces could be applied in water/oil transportation, oil-

repellent and self-cleaning coatings, water/oil separation, micro?uidics, and so on.