Frank Bradley D, Antonietti Markus, Zeininger Lukas
Department of Colloid Chemistry, Max Planck Institute of Colloids & Interfaces, Am Muehlenberg 1, 14476 Potsdam, Germany.
Macromolecules. 2021 Jan 26;54(2):981-987. doi: 10.1021/acs.macromol.0c02152. Epub 2020 Dec 7.
A facile one-step approach for the synthesis of physically and chemically anisotropic polymer particles with tunable size, shape, composition, wettability, and functionality is reported. Specifically, dynamically reconfigurable oil-in-water Janus emulsions containing photocurable hydrocarbon or fluorocarbon acrylate monomers as one of the droplet phases are used as structural templates to polymerize them into precision Janus particles with highly uniform anomalous morphologies including (hemi-) spheres, lenses, and bowls. During polymerization, each interface is exposed to a different chemical environment, yielding particles with an intrinsic Janus character that can be amplified via side-selective postfunctionalization. The fabrication method allows to start with various common emulsification techniques, thus generating particles in the range of 200 nm -150 μm, also at a technical scale. The anisotropic shape combined with the asymmetric wettability profile of the produced particles promotes their directed self-assembly into colloidal clusters as well as their directional alignment at fluid interfaces. We foresee the application of such Janus particles in technical emulsions or oil recovery, for the manufacturing of programmed self-assembled architectures, and for the engineering of microstructured interfaces.
报道了一种简便的一步法，用于合成具有可调尺寸、形状、组成、润湿性和功能的物理和化学各向异性聚合物颗粒。具体而言，含有光固化烃类或氟代烃丙烯酸酯单体作为液滴相之一的动态可重构水包油型Janus乳液被用作结构模板，将它们聚合成具有高度均匀异常形态的精密Janus颗粒，包括（半）球体、透镜体和碗状体。在聚合过程中，每个界面都暴露在不同的化学环境中，从而产生具有固有Janus特性的颗粒，这种特性可以通过侧选择性后功能化得到增强。该制备方法允许从各种常见的乳化技术开始，从而在技术规模上也能生成200nm至150μm范围内的颗粒。所制备颗粒的各向异性形状与不对称润湿性分布相结合，促进了它们定向自组装成胶体簇以及在流体界面处的定向排列。我们预见这种Janus颗粒可应用于工业乳液或石油开采、用于制造程序化自组装结构以及用于微结构界面工程。
