Amphiphilic Janus particles are mixed with homogeneous binder particles with strong adhesion to create robust hydrophobic coatings through a unique self-stratification process. Intriguingly, Janus particles form a complete and densely packed monolayer with their hydrophobic sides orienting towards air, which effectively increases the water contact angle to ∼130°, while the hydrophilic sides sustain strong adhesion with the coating layer. The coating maintains its high contact angle even after solvent rinsing, whereas conventional coating completely breaks down. Experimental data and preliminary theoretical modeling suggest that the stratification are partially due to the strong adsorption of Janus particles at the water–air interface, although the detailed mechanisms require more thorough investigation. Remarkably, simply adding Janus particles renders a hydrophilic commercial primer coating surface hydrophobic and drastically reduces the surface tackiness. This cost-effective and commercially scalable method offers a convenient way to fabricate advanced structures at the interface and can be broadly applicable to many other colloidal systems.

中文翻译：

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两性Janus颗粒在涂层表面的自分层

将两亲性Janus颗粒与均一的粘合剂颗粒混合，并具有很强的附着力，通过独特的自分层过程可形成坚固的疏水性涂层。有趣的是，Janus颗粒形成完整且密实的单层，其疏水侧朝向空气，有效地将水接触角增加至〜130°，而亲水侧则与涂层保持牢固的粘合力。即使在溶剂冲洗后，该涂层仍保持其高接触角，而常规涂层会完全破裂。实验数据和初步的理论模型表明，分层的部分原因是Janus颗粒在水-空气界面上的强烈吸附，尽管详细的机理需要更深入的研究。值得注意的是 简单地添加Janus颗粒可使亲水性商业底漆涂层表面具有疏水性，并大大降低表面粘性。这种经济高效且可商业扩展的方法提供了一种在界面处制造高级结构的便捷方法，并且可以广泛地应用于许多其他胶体系统。