Relevance of packing to colloidal self-assembly
Relevance of packing to colloidal self-assembly
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DOI：
10.1073/pnas.1720139115
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发表时间：
2018-02-13
影响因子：
11.1
通讯作者：
Glotzer, Sharon C.
中科院分区：
文献类型：
--
作者：
Cersonsky, Rose K.;van Anders, Greg;Glotzer, Sharon C.
自20世纪20年代以来，填充参数已被用于合理化从原子混合物到胶体晶体的系统中的晶体结构。包装参数最近被应用于复杂的纳米颗粒结构，在那里他们经常，但并不总是，工作。我们检查时，如果有的话，包装是一个因果机制，在硬颗粒近似的胶体晶体。我们研究了三种由理想堆积形状组成的晶体结构。我们表明，与预期相反，订购机制不能包装，即使当的自组装结构是相同的denumbered包装。我们还表明，最好的颗粒形状的硬颗粒胶体晶体在任何有限的压力是不完美的版本的理想包装形状。
Since the 1920s, packing arguments have been used to rationalize crystal structures in systems ranging from atomic mixtures to colloidal crystals. Packing arguments have recently been applied to complex nanoparticle structures, where they often, but not always, work. We examine when, if ever, packing is a causal mechanism in hard particle approximations of colloidal crystals. We investigate three crystal structures composed of their ideal packing shapes. We show that, contrary to expectations, the ordering mechanism cannot be packing, even when the thermodynamically self-assembled structure is the same as that of the densest packing. We also show that the best particle shapes for hard particle colloidal crystals at any finite pressure are imperfect versions of the ideal packing shape.