Abstract Janus particles with controlled asymmetries and functionalities represent promising building blocks and functional materials due to their unique anisotropic features. Herein, we show a facile and general approach towards preparing colloidal Janus particles with adjustable surface asymmetries and functionalities based on monolayer colloidal crystal (MCC) templates combined with mussel-inspired polydopamine (PDA) chemistry at an air-water interface. First, monodisperse colloidal polystyrene/polydopamine (PS/PDA) Janus particles with tunable asymmetrical geometries are synthesized by polymerizing dopamine onto two-dimensional (2D) polystyrene (PS) monolayer colloidal crystals formed at the air-water interface. Moreover, the good chemical reactivity of the PDA coating makes it a versatile platform to introduce a variety of functional materials, e.g., metal nanoparticles and organic molecules, producing colloidal Janus particles with adjustable functionalities. Finally, we demonstrate this synthetic strategy not only provides a controllable method for the fabrication of monodisperse colloidal Janus particles but also opens up a new Janus platform for artificially designed Janus particles with tunable asymmetries and functionalities.

中文翻译：

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仿生聚多巴胺涂层作为在空气-水界面合成不对称 Janus 粒子的多功能平台

摘要 具有受控不对称性和功能性的 Janus 粒子由于其独特的各向异性特征而代表了有前途的构建块和功能材料。在此，我们展示了一种基于单层胶体晶体 (MCC) 模板与受贻贝启发的聚多巴胺 (PDA) 化学结合在空气-水界面上制备具有可调表面不对称性和功能性的胶体 Janus 粒子的简便而通用的方法。首先，通过将多巴胺聚合到在空气-水界面形成的二维 (2D) 聚苯乙烯 (PS) 单层胶体晶体上，合成具有可调不对称几何形状的单分散胶体聚苯乙烯/聚多巴胺 (PS/PDA) Janus 粒子。而且，PDA 涂层良好的化学反应性使其成为引入各种功能材料的多功能平台，例如金属纳米颗粒和有机分子，生产具有可调节功能的胶体 Janus 颗粒。最后，我们展示了这种合成策略不仅为单分散胶体 Janus 粒子的制造提供了一种可控的方法，而且还为人工设计的具有可调不对称性和功能的 Janus 粒子开辟了一个新的 Janus 平台。