如何引导活性胶体沿垂直壁向上攀爬
How to steer active colloids up a vertical wall
AI总结：
本文通过实验和数值模型研究自推进Janus胶体在垂直壁上的动态吸附与攀爬现象，揭示粘附且取向的壁面如何增强体相极性异质性，从而驱动粒子克服重力形成稳态全局通量。
摘要：
活性物质领域的一个重要挑战在于，从局部产生功的实体（例如通过自推进）中获取有用的全局功。我们在此研究经典毛细上升效应的活性物质版本，考虑与垂直壁接触的自推进Janus胶体的非相分离沉积物。我们提供了壁面处意外且动态的吸附层的实验证据。此外，我们开发了一个补充的数值模型，该模型重现了实验观察结果。我们表明，具有粘附性和取向性的壁面增强了体相中预先存在的极性异质性，使极性活性粒子能够克服重力沿壁向上攀爬，从而有效地驱动全局通量。这种稳态通量在被动润湿层中没有对应物。
英文摘要：
An important challenge in active matter lies in harnessing useful global work from entities that produce work locally, e.g., via self-propulsion. We investigate here the active matter version of a classical capillary rise effect, by considering a non-phase separated sediment of self-propelled Janus colloids in contact with a vertical wall. We provide experimental evidence of an unexpected and dynamic adsorption layer at the wall. Additionally, we develop a complementary numerical model that recapitulates the experimental observations. We show that an adhesive and aligning wall enhances the pre-existing polarity heterogeneity within the bulk, enabling polar active particles to climb up a wall against gravity, effectively powering a global flux. Such steady-state flux has no equivalent in a passive wetting layer.
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