Self-assembly of reconfigurable colloidal molecules
Self-assembly of reconfigurable colloidal molecules
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DOI：
10.1039/c4sm00026a
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发表时间：
2014-01-01
期刊：
影响因子：
3.4
通讯作者：
Glotzer, Sharon C.
中科院分区：
文献类型：
--
作者：
Ortiz, Daniel;Kohlstedt, Kevin L.;Glotzer, Sharon C.
Sacanna等人的锁和钥匙胶体颗粒。是由中心球形胶体颗粒(钥匙)通过耗尽相互作用连接到有限数量的凹陷胶体颗粒(锁)上的新颖的“动态”积木，其强度足以将颗粒结合在一起，但又足够弱，以至于锁可以围绕钥匙自由旋转。这种自转使这些胶体“分子”具有机械可重构性。在这里，我们使用分子模拟来预测这些锁和钥匙构建块可以自组装成一系列复杂的晶体结构，这些结构可以通过一组可重新配置的维度进行调整：每个构建块的锁的数量、键长、大小比、限制和锁的移动性。我们证明，在可重新配置的情况下，有序结构--如随机三角形正方形平铺--可以组装，尽管不可重新配置但相似的构建块在动力学上是不可访问的。
The lock-and-key colloidal particles of Sacanna et al. are novel "dynamic" building blocks consisting of a central spherical colloidal particle (key) attached to a finite number of dimpled colloidal particles (locks) via depletion interactions strong enough to bind the particles together but weak enough that the locks are free to rotate around the key. This rotation imbues a mechanical reconfigurability to these colloidal "molecules". Here we use molecular simulation to predict that these lock-and-key building blocks can self-assemble into a wide array of complex crystalline structures that are tunable via a set of reconfigurability dimensions: the number of locks per building block, bond length, size ratio, confinement, and lock mobility. We demonstrate that, with reconfigurability, ordered structures - such as random triangle square tilings - assemble, despite being kinetically inaccessible with non-reconfigurable but similar building blocks.