溶液中胶体颗粒的组装。
Assembly of colloidal particles in solution.
作者信息
Zhao Kun, Mason Thomas G
机构信息
Key Laboratory of Systems Bioengineering (Ministry of Education), School of Chemical Engineering and Technology, Tianjin University, Tianjin 300072, People's Republic of China.
出版信息
Rep Prog Phys. 2018 Dec;81(12):126601. doi: 10.1088/1361-6633/aad1a7. Epub 2018 Jul 6.
Advances in both top-down and bottom-up syntheses of a wide variety of complex colloidal building blocks and also in methods of controlling their assembly in solution have led to new and interesting forms of highly controlled soft matter. In particular, top-down lithographic methods of producing monodisperse colloids now provide precise human-designed control over their sub-particle features, opening up a wide range of new possibilities for assembly structures that had been previously limited by the range of shapes available through bottom-up methods. Moreover, an increasing level of control over anisotropic interactions between these colloidal building blocks, which can be tailored through local geometries of sub-particle features as well as site-specific surface modifications, is giving rise to new demonstrations of massively parallel off-chip self-assembly of specific target structures with low defect rates. In particular, new experimental realizations of hierarchical self-assembly and control over the chiral purity of resulting assembly structures have been achieved. Increasingly, shape-dependent, shape-complementary, and roughness-controlled depletion attractions between non-spherical colloids are being used in novel ways to create assemblies that go far beyond early examples, such as fractal clusters formed by diffusion-limited and reaction-limited aggregation of spheres. As self-assembly methods have progressed, a wide variety of advanced directed assembly methods have also been developed; approaches based on microfluidic control and applying structured electromagnetic fields are particularly promising.
在各种复杂胶体构建块的自顶向下和自底向上合成方面取得的进展,以及在溶液中控制其组装方法方面的进展,已产生了新型且有趣的高度可控软物质形式。特别是,生产单分散胶体的自顶向下光刻方法现在能对其亚颗粒特征进行精确的人为设计控制,为组装结构开辟了广泛的新可能性,而这些组装结构以前受到自底向上方法可获得形状范围的限制。此外,对这些胶体构建块之间各向异性相互作用的控制水平不断提高,这种相互作用可通过亚颗粒特征的局部几何形状以及特定位置的表面修饰来定制,这正催生具有低缺陷率的特定目标结构大规模并行片外自组装的新实例。特别是,已经实现了分层自组装的新实验实例以及对所得组装结构手性纯度的控制。越来越多的非球形胶体之间形状依赖、形状互补和粗糙度控制的耗尽吸引力正以新颖的方式被用于创建远远超越早期实例(如由球体的扩散限制和反应限制聚集形成的分形簇)的组装体。随着自组装方法的发展,还开发了各种各样先进的定向组装方法;基于微流体控制和应用结构化电磁场的方法尤其有前景。