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Relevance of packing to colloidal self-assembly.

ABSTRACT: 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.

SUBMITTER: Cersonsky RK

PROVIDER: S-EPMC5816204 | biostudies-literature | 2018 Feb

REPOSITORIES: biostudies-literature

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Relevance of packing to colloidal self-assembly.

Cersonsky Rose K RK van Anders Greg G Dodd Paul M PM Glotzer Sharon C SC

Proceedings of the National Academy of Sciences of the United States of America 20180130 7

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, t ...[more]

PMID: 29382766

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