writer：M. Zhang, L. Wang, Y. Hou, S. Feng, Y. Zheng*.
keywords：Anisotropic, Unidirectional, Gradient
source：期刊
specific source：Adv. Mater. 2015,DOI: 10.1002/adma.201502143
Issue time：2015年
It presents a smart anisotropic-unidirectional spreading of droplet that is controlled effectively by a hydrophilic
component (chitosan, CHI) gradient on aligned PET (poly ester)/CHI fi brous surface. A CHI-composition gradient

is formed along the aligned fi bers by using a lifting-dissolution method. Thus various WGs can be introduced onto the aligned fi ber surface to control the liquid-spreading behaviors. In addition, a V-shaped WG surface is used to control two droplets in opposite direction to move together in a liquid reaction. The study introduces a mechanism of the integrative cooperative forces between anisotropic contact line force and WG force that result from anisotropic aligned fi bers and CHI-composition gradient. This fi nding offers an insight into the design of the systems and devices that can control the microfl uid movement effectively.

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