Gram-scale fabrication of patchy nanoparticles with tunable spatial topology and chemical functionality
Gram-scale fabrication of patchy nanoparticles with tunable spatial topology and chemical functionality
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DOI：
10.1007/s12274-020-3270-2
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发表时间：
2021-01
期刊：
影响因子：
9.9
通讯作者：
Jiecheng Cui;Yi Li;Huili Yuan;Ning Gao;Kai Feng;Wenyun Li;Kang Zhou;Xianpeng Yin;Guangtao Li
中科院分区：
文献类型：
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作者：
Jiecheng Cui;Yi Li;Huili Yuan;Ning Gao;Kai Feng;Wenyun Li;Kang Zhou;Xianpeng Yin;Guangtao Li
斑块粒子是指具有一个或多个明确斑块的粒子，由于其各向异性和方向性的相互作用而引起了人们的极大关注。片状颗粒表面的各向异性特性使其能够在一定程度上控制组装过程。已经进行了巨大的努力来设计和探索片状粒子的性质及其集体行为。然而，制备片状粒子的技术在可调性和可伸缩性方面仍然受到限制。在这项工作中，提出了一种有效的方法来制备具有可调空间拓扑和斑块化学组成的片状粒子。通过调整胶体颗粒的堆积和加工条件，可以定制贴片的数量、分布和大小。聚多巴胺(PDA)涂层表面和二氧化硅表面的活性二次反应可以使得到的片状粒子具有所需的性能，以满足不同的要求。作为原理的证明，PDA涂层贴片通过Michael反应被硫醇基染料修饰，二氧化硅表面通过硅烷偶联反应被端胺基烷氧基硅烷功能化。此外，PDA的独特性质，如还原能力、强大的粘合能力和可碳化特性，也被证明可以制备金属纳米颗粒修饰的片状颗粒和各向异性的碳纳米胶囊。以胶体晶体为模板，制备出定义良好的片状颗粒，易于实现克级尺度的制备。这些结果表明，我们的策略将有助于获得片状颗粒在合理设计和大规模生产功能材料中的转化潜力。
Patchy particles, defined as particles with one or more well-defined patches, have attracted much attention due to their anisotropic and directional interactions. The anisotropic nature of the patchy particle surface enables a certain degree of control over the assembly process. Enormous efforts have been carried out to design and explore the properties of patchy particles and their collective behaviour. However, the techniques to fabricate patchy particles are still limited in terms of tunability and scalability. In this work, an effective method of fabricating patchy particles with tunable spatial topology and chemical composition of patches is presented. The number, distribution and size of the patches can be tailored by adjusting the packing of the colloidal particles and the processing condition. The active secondary reaction on the polydopamine (PDA)-coated surface and silica surface could functionalize the obtained patchy particles with desired properties to meet different requirements. As a proof of principle, the PDA-coated patches were modified with thiol-based dye via the Michael reaction and the silica surfaces were functionalized with amine-terminated alkoxysilanes via the silane coupling reaction have been demonstrated. Furthermore, the unique properties of PDA, such as reductive ability, powerful adhesive capability and carbonizable feature, have also been proven to fabricate metallic nanoparticle-decorated patchy particles and anisotropic carbon nanocapsules. The well-defined patchy particles are templated from colloidal crystal and their gram-scale fabrication is easily achieved. These results indicate that our strategy will help access the transformative potential of patchy particles in the rational design and large-scale production of functional materials.