作者：Xuejie Liu, Nan Yan, Jing Jin, Yanqiu Du, Wei Jiang
关键字：无机纳米粒子, 自组装, 乳液液滴, 多面体胶体团簇, 界面自由能
论文来源：期刊
具体来源：Nano Letters, 2023, 23(17), 8022-8028
发表时间：2023年

摘要：由功能无机纳米粒子组装的多面体胶体团簇在科学研究和应用中都引起了广泛关注。然而，胶体纳米粒子自发组装成形状规则、结构可调的多面体团簇仍是一大挑战。本文通过精确调控纳米粒子与油/水界面的界面相互作用，成功构建了由接枝聚苯乙烯（PS）和聚2-乙烯基吡啶（P2VP）均聚物混合物的金纳米粒子组装的Mackay二十面体和规则四面体胶体团簇。通过增加金纳米粒子表面亲水P2VP配体的比例，Mackay二十面体团簇可转变为规则四面体团簇，以最大化多面体组装体的表面积。研究还揭示了规则多面体胶体团簇的形成机理：多面体胶体团簇的形成不仅依赖于熵，还由界面自由能决定。该发现为将纳米粒子组织成多面体胶体团簇提供了有效方法，在多个领域具有潜在应用。

Abstract：Polyhedral colloidal clusters assembled from functional inorganic nanoparticles have attracted great interest in both scientific research and applications. However, the spontaneous assembly of colloidal nanoparticles into polyhedral clusters with regular shape and tunable structures remains a grand challenge. Here, we successfully construct Mackay icosahedral and regular tetrahedral colloidal clusters assembled from gold nanoparticles grafted with a mixture of polystyrene (PS) and poly(2-vinylpyridine) (P2VP) homopolymers by precisely tuning the interfacial interaction between the nanoparticles and the oil/water interface. By increasing the proportion of hydrophilic P2VP ligands on the surface of gold nanoparticles, the Mackay icosahedral clusters can transform into regular tetrahedral clusters in order to maximize the surface area of the polyhedral assembly. Furthermore, we reveal the formation mechanism of these regular polyhedral colloidal clusters. The formation of polyhedral colloidal clusters is not only dependent on the entropy but also determined by the interfacial free energy. This finding demonstrates an effective approach to organize nanoparticles into polyhedral colloidal clusters with potential applications in various fields.

论文链接：https://doi.org/10.1021/acs.nanolett.3c01995