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    Dynamically Gas-Phase Switchable Super(de) wetting States by Reversible Amphiphilic Functionalization: A Powerful Approach for Smart Fluid Gating Membranes

    Year: 2018

    Journal: Adv. Funct. Mater., Volume 28, JAN 10

    Authors: Wong, William S. Y.; Gengenbach, Thomas; Nguyen, Hieu T.; Gao, Xiang; Craig, Vincent S. J.; Tricoli, Antonio

    Organizations: ARC Discovery Project [DP150101939, DE160100569]; Australian National University; Australian Microscopy and Microanalysis Research Facility (AMMRF)

    Keywords: amphiphiles; fluid gating; gas-phase triggers; self-assembly; switchable super(de)wetting

    In nature, cellular membranes perform critical functions such as endocytosis and exocytosis through smart fluid gating processes mediated by nonspecific amphiphilic interactions. Despite considerable progress, artificial fluid gating membranes still rely on laborious stimuli-responsive mechanisms and triggering systems. In this study, a room temperature gas-phase approach is presented for dynamically switching a porous material from a superhydrophobic to a superhydrophilic wetting state and back. This is realized by the reversible attachment of bipolar amphiphiles, which promote surface wetting. Application of this reversible amphiphilic functionalization to an impermeable nanofibrous membrane induces a temporary state of superhydrophilicity resulting in its pressure-less permeation. This mechanism allows for rapid smart fluid gating processes that can be triggered at room temperature by variations in the environment of the membrane. Owing to the universal adsorption of volatile amphiphiles on surfaces, this approach is applicable to a broad range of materials and geometries enabling facile fabrication of valve-less flow systems, fluid-erasable microfluidic arrays, and sophisticated microfluidic designs.
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