Laboratory of Physical Chemistry and Center for Multiscale Electron Microscopy, Department of Chemical Engineering and Chemistry, Eindhoven University of Technology, Eindhoven, The Netherlands.
Institute for Complex Molecular Systems, Eindhoven University of Technology, Eindhoven, The Netherlands.
Mater Horiz. 2022 Oct 3;9(10):2572-2580. doi: 10.1039/d2mh00574c.
Control over the assembly and morphology of nanoscale functional building blocks is of great importance to hybrid and porous nanomaterials. In this paper, by combining different types of spherical nanoparticles with different size ratios in a hierarchical assembly process which allows us to control the final structure of multi-component assemblies, we discuss self-assembly of an extensive range of supraparticles, labelled as AB particles, and an extension to novel ternary particles, labelled as ABC particles. For supraparticles, the organization of small nanoparticles is known to be inherently related to the size ratio of building blocks. Therefore, we studied the formation of supraparticles prepared by colloidal self-assembly using small silica nanoparticles (SiO NPs) attached on the surface of large polystyrene latex nanoparticles (PSL NPs) with a wide size ratio range for complete and partial coverage, by controlling the electrostatic interactions between the organic and inorganic nanoparticles and their concentrations. In this way hierarchically ordered, stable supraparticles, either fully covered or partially covered, were realized. The partially covered, stable AB supraparticles offer the option to create ABC supraparticles of which the fully covered shell contains two different types of nanoparticles. This has been experimentally confirmed using iron oxide (FeO) nanoparticles together with silica nanoparticles as shell particles on polystyrene core particles. Cryo-electron tomography was used to visualize the AB binary and ABC ternary supraparticles and to determine the three-dimensional structural characteristics of supraparticles formed under different conditions.
控制纳米级功能构建块的组装和形态对于混合和多孔纳米材料非常重要。在本文中，通过在分级组装过程中结合不同尺寸比的不同类型的球形纳米粒子，我们可以控制多组分组装体的最终结构，从而讨论了广泛的超粒子（标记为 AB 粒子）的自组装以及对新型三元粒子（标记为 ABC 粒子）的扩展。对于超粒子，已知小纳米粒子的组织与构建块的尺寸比固有相关。因此，我们通过胶体自组装使用小的硅纳米粒子（SiO NPs）来研究由胶体自组装制备的超粒子的形成，该小的硅纳米粒子（SiO NPs）附着在具有宽尺寸比范围的大聚苯乙烯乳胶纳米粒子（PSL NPs）的表面上，用于完全和部分覆盖，通过控制有机和无机纳米粒子及其浓度之间的静电相互作用。以这种方式实现了分级有序的稳定超粒子，无论是完全覆盖还是部分覆盖。部分覆盖的稳定 AB 超粒子提供了创建 ABC 超粒子的选项，其中完全覆盖的壳包含两种不同类型的纳米粒子。这已经使用氧化铁（FeO）纳米粒子与作为壳粒子的硅纳米粒子在聚苯乙烯核粒子上进行了实验证实。冷冻电子断层扫描术用于可视化 AB 二元和 ABC 三元超粒子，并确定在不同条件下形成的超粒子的三维结构特征。
