Membranes with asymmetric wettability‐Janus membranes‐have recently received considerable attention for a variety of critical applications. Here, we report on a simple approach to introduce asymmetric wettability into hydrophilic porous domains. Our approach is based on the physicochemical‐selective deposition of polytetrafluoroethylene (PTFE) on hydrophilic polymeric substrates. To achieve selective deposition of PTFE, we inhibit the polymerization reaction within the porous domain. We prefill the substrates with glycerol, containing a known amount of free radical inhibitor, and utilize initiated chemical vapor deposition (iCVD) for the polymerization of PTFE. We show that the glycerol/inhibitor mixture hinders the deposition of PTFE within the membrane pores. As a result, the surface of the substrates remains open and porous. The fabricated Janus membranes show stable wetting‐resistant properties, evaluated through sessile drop contact angle measurements and direct contact membrane distillation (DCMD).

中文翻译：

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通过物理化学选择性化学气相沉积制备Janus膜

具有不对称润湿性的膜-Janus膜-最近在各种关键应用中受到了广泛关注。在这里，我们报告了一种将不对称润湿性引入亲水性多孔域的简单方法。我们的方法基于聚四氟乙烯（PTFE）在亲水性聚合物基材上的物理化学选择性沉积。为了实现PTFE的选择性沉积，我们抑制了多孔区域内的聚合反应。我们用含有已知量的自由基抑制剂的甘油预填充基材，并利用引发的化学气相沉积（iCVD）进行PTFE聚合。我们表明，甘油/抑制剂混合物阻碍了PTFE在膜孔中的沉积。结果，基板的表面保持开放和多孔。