Surfaces that entrap air underwater serve numerous practical applications, such as mitigating cavitation erosion and reducing frictional drag. These surfaces typically rely on perfluorinated coatings. However, the non‐biodegradability and fragility of the coatings limit practical applications. Thus, coating‐free, sustainable, and robust approaches are desirable. Recently, a microtexture comprising doubly reentrant cavities (DRCs) has been demonstrated to entrap air on immersion in wetting liquids. While this is a promising approach, insights into the effects of surface chemistry, hydrostatic pressure, and cavity dimensions on wetting transitions in DRCs remain unavailable. In response, Cassie‐to‐Wenzel transitions into circular DRCs submerged in water are investigated and compared with those in cylindrical “simple” cavities (SCs). It is found that at low hydrostatic pressures (≈50 Pa), DRCs with hydrophilic (θ_o ≈ 40°) and hydrophobic (θ_o ≈ 112°) make‐ups fill within 10⁵ and 10⁷ s, respectively, while SCs with hydrophilic make‐up fill within <10⁻² s. Under elevated hydrostatic pressure (P ≤ 90 kPa), counterintuitively, DRCs with hydrophobic make‐up fill dramatically faster than the commensurate SCs. This comprehensive report should provide a rational framework for harnessing microtexturing and surface chemistry toward coating‐free liquid repellency.

中文翻译：

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双凹腔的反直润湿转变与表面组成，静水压力和腔纵横比的函数

水下夹带空气的表面可用于许多实际应用，例如减轻气蚀和减少摩擦阻力。这些表面通常依赖于全氟化涂层。但是，涂料的非生物降解性和脆性限制了实际应用。因此，需要无涂层，可持续且坚固的方法。近来，已经证明了包含双凹腔（DRC）的微纹理在浸入润湿液体中时会截留空气。尽管这是一种很有前途的方法，但仍无法深入了解表面化学，静水压力和空腔尺寸对DRC润湿转变的影响。因此，研究了Cassie到Wenzel过渡到浸没在水中的圆形DRC，并将其与圆柱“简单”型腔（SC）中的过渡进行了比较。_ø  ≈40℃）和疏水性（θ _ø  ≈112°）彩妆产品填充在10个⁵和10 ⁷ S，分别，同时与<10内的亲水性化妆填充的SC ^-2秒。在升高的静水压力（P  ≤90千帕），违反直觉地，用疏水性化妆填充显着比相称的SC更快的DRC。这份全面的报告应提供一个合理的框架，以利用微织构和表面化学实现无涂层的拒液性。