Shneidman Anna V, Zhang Cathy T Y, Mandsberg Nikolaj K, Picece Vittoria C T M, Shirman Elijah, Paink Gurminder K, Nicolas Natalie J, Aizenberg Joanna
Harvard John A. Paulson School of Engineering and Applied Sciences, 150 Western Ave., Boston MA 02134, USA.
Karlsruhe Institute of Technology (KIT) Institute of Biological and Chemical Systems - Functional Molecular Systems (IBCS-FMS) Kaiserstrasse 12, 76131 Karlsruhe, Germany.
Soft Matter. 2024 Sep 25;20(37):7502-7511. doi: 10.1039/d4sm00458b.
Hierarchically structured supraparticles can be produced by drying droplets of colloidal suspensions. Using binary suspensions provides degrees of structural and functional control beyond those possible for single components, while remaining tractable for fundamental mechanistic studies. Here, we implement evaporative co-assembly of two distinct particle types - 'large' polystyrene microparticles and 'small' inorganic oxide nanoparticles (silica, titania, zirconia, or ceria) - dried on superhydrophobic surfaces to produce bowl-shaped supraparticles. We extend this method to raspberry colloid templating, in which the binary suspension consists of titania nanoparticles together with gold-decorated polystyrene colloids. Following removal of the polymer particles, we demonstrate catalytic oxidative coupling of methanol to methyl formate using the resulting mesoporous supraparticles, showcasing their practical application.
通过干燥胶体悬浮液的液滴可以制备分层结构的超粒子。使用二元悬浮液可提供超出单一组分可能实现的结构和功能控制程度，同时对于基础机理研究而言仍易于处理。在此，我们实现了两种不同类型粒子——“大”的聚苯乙烯微粒和“小”的无机氧化物纳米粒子（二氧化硅、二氧化钛、氧化锆或二氧化铈）——在超疏水表面上干燥的蒸发共组装，以制备碗状超粒子。我们将此方法扩展至覆盆子胶体模板法，其中二元悬浮液由二氧化钛纳米粒子与金修饰的聚苯乙烯胶体组成。去除聚合物粒子后，我们使用所得的介孔超粒子展示了甲醇催化氧化偶联生成甲酸甲酯的过程，展示了它们的实际应用。
