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Colloidal interactions and unusual crystallization versus de-mixing of elastic multipoles formed by gold mesoflowers | | Ye Yuan
; Mykola Tasinkevych
; Ivan I. Smalyukh
; | | Date: |
3 Jan 2020 | | Abstract: | Colloidal interactions in nematic liquid crystals can be described as
interactions between elastic multipoles that depend on particle shape,
topology, chirality, boundary conditions and induced topological defects. Here,
we describe a nematic colloidal system consisting of mesostructures of gold
capable of inducing elastic multipoles of different order. Elastic monopoles
are formed by relatively large asymmetric mesoflower particles, for which
gravity and elastic torque balancing yields monopole-type interactions.
High-order multipoles are instead formed by smaller mesoflowers with a myriad
of shapes corresponding to multipoles of different orders, consistent with our
computer simulations based on free energy minimization. We reveal unexpected
many-body interactions in this colloidal system, ranging from de-mixing of
elastic monopoles to a zoo of unusual colloidal crystals formed by high-order
multipoles like hexadecapoles. Our findings show that gold mesoflowers may
serve as a designer toolkit for engineering colloidal interaction and
self-assembly, potentially exceeding that in atomic and molecular systems. | | Source: | arXiv, 2001.0910 | | Services: | Forum | Review | PDF | Favorites | |
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