Fast and High‐Angle‐Climbing Capable Self‐Driven Surface Directional Liquid Transport via Bio‐Inspired Eccentric Channels

Abstract Self‐propelled directional liquid transport plays a vital role in chemical and new power source engineering scenarios. Without external energy, liquid transport over long distances is hindered by multiple resistances, limiting flow velocity, while uphill movement is further impeded by gravity. To address that, inspired by the labial palps of the insects, which efficiently guide droplets toward the mouth, a bioinspired eccentric ring (BER) structure is developed that mimics this directional transport capability. Stainless steel substrates are processed via femtosecond laser ablation to create micro/nano hierarchical textures, followed by selective tungsten sputtering to form superhydrophobic and superhydrophilic regions. This design creates a surface energy difference that enables rapid, low‐resistance liquid movement along predefined channels. Experiments show that water droplets fully wet a 35 mm BER channel in 4.7 s. Moreover, the BER structure enables directional water transport on inclined surfaces against gravity, driven by its superhydrophobic‐to‐superhydrophilic wettability difference and unique low‐resistance structural design. This design enables efficient and multidirectional water transport, highlighting its potential for applications in microfluidic devices, energy harvesting, and passive water control systems. The bioinspired design enhances the efficiency and precision of water distribution, offering new possibilities for the development of self‐driven water transport systems.