Anisotropic Wetting of Water on Patterned Asymmetric Nanostructure Arrays.
作者：Peng Ge, Shuli Wang, Wendong Liu, Tieqiang Wang, Nianzuo Yu, Peihong Xue, Hongxu Chen, Huaizhong
關鍵字：none
論文來源：期刊
具體來源：Adv. Mater. Interfaces
發表時間：2017年
This paper reports the directional wetting behavior of water on a patterned
heterogeneous surface, which is integrated by two asymmetric nanostruc-
tures with different directions. The asymmetric nanostructures are Janus
silicon cylinder arrays (Si-CAs) modified by molecules with distinct surface
energies on two sides. Through a photolithography process, the two asym-
metric nanostructures are integrated in a single surface to form chessboard
patterns with different directions. When water is injected onto the patterned
surface, water droplets wet in a unidirectional manner, and the wetting direc-
tion is along resultant direction of the two wetting directions of water on
the two asymmetric patterns. This paper investigates the factors which may
influence the wetting behavior of water on the surface, experimental results
show that patterned asymmetric surfaces prepared from different chessboard
pattern size, Si-CAs with different diameters, and different morphology-
symmetric structures do not affect the wetting property, but the molecules
modified on two sides do. Larger surface energy difference between the modi-
fied molecules improves the ability of the surfaces induce water moving. It is
believed that the patterned asymmetric nanostructure arrays provide a new
strategy to modulate the wetting behavior of water, which will show poten-
tial applications in microfluidics and others involving unidirectional liquid
manipulation.