Ma Wende, Zhang Ning, Long Caicheng, Shu Zhao, Liu Yacong, Lin Yue, Lu Dawei, Liu Qian, Jiang Guibin
State Key Laboratory of Environmental Chemistry and Ecotoxicology, Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences, Beijing, 100085, China.
Henan International Joint Laboratory of Medicinal Plants Utilization, College of Chemistry and Molecular Sciences, Henan University, Kaifeng, Henan, 475004, China.
Small. 2024 Oct;20(43):e2403331. doi: 10.1002/smll.202403331. Epub 2024 Jun 19.
Precise self-assembly of colloidal particles is crucial for understanding their aggregation properties and preparing macroscopic functional devices. It is currently very challenging to synthesize and self-assemble super-uniform covalent organic framework (COF) colloidal particles into well-organized multidimensional superstructures. Here, simple and versatile strategies are proposed for synthesis of super-uniform COF colloidal particles and self-assembly of them into 1D supraparticles, 2D ordered mono/multilayers, and 3D COF films. For this purpose, several self-assembly techniques are developed, including emulsion solvent evaporation, air-liquid interfacial self-assembly, and drop-casting. These strategies enable the superstructural self-assembly of particles of varying sizes and species without any additional surfactants or chemical modifications. The assembled superstructures maintain the porosity and high specific surface area of their building blocks. The feasibility of the strategies is examined with different types of COFs. This research provides a new approach for the controllable synthesis of super-uniform COF colloidal particles capable of self-assembling into multidimensional superstructures with long-range order. These discoveries hold great promise for the design of emerging multifunctional COF superstructures.
胶体颗粒的精确自组装对于理解其聚集特性和制备宏观功能器件至关重要。目前，将超均匀的共价有机框架（COF）胶体颗粒合成并自组装成有序的多维超结构极具挑战性。在此，我们提出了简单且通用的策略，用于合成超均匀的COF胶体颗粒，并将它们自组装成一维超粒子、二维有序单层/多层以及三维COF薄膜。为此，我们开发了几种自组装技术，包括乳液溶剂蒸发、气液界面自组装和滴铸法。这些策略能够实现不同尺寸和种类颗粒的超结构自组装，无需任何额外的表面活性剂或化学修饰。组装后的超结构保留了其构建单元的孔隙率和高比表面积。我们用不同类型的COF检验了这些策略的可行性。这项研究为可控合成能够自组装成长程有序的多维超结构的超均匀COF胶体颗粒提供了一种新方法。这些发现为新型多功能COF超结构的设计带来了巨大希望。
