The tilted-nanohair arrays (TNAs) and tilted-Janusian-nanohair arrays (TJNAs) with the structural and chemical asymmetries are fabricated using a facile two-step process combining Faraday-cage-assisted plasma nanotexturing and plasma polymerization. The directional liquid transport (DLT) against the tilt direction of nanohair and in the reverse direction is achieved on TNAs and TJNAs, respectively. A two-dimension model involving the asymmetric geometry of tilted nanohairs and the related imbibition priority of water meniscus in the inter-nanohair spaces is presented to predict the preferential direction of liquid spreading. Channels with TNAs and TJNAs can be fabricated for exquisite flow control in diverse functional fluidic devices.
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