Linked topological colloids in a nematic host

Angel Martinez, Leonardo Hermosillo, Mykola Tasinkevych, Ivan I. Smalyukh

Research output: Contribution to journalArticlepeer-review

19 Scopus citations

Abstract

Geometric shape and topology of constituent particles can alter many colloidal properties such as Brownian motion, self-assembly, and phase behavior. Thus far, only single-component building blocks of colloids with connected surfaces have been studied, although topological colloids, with constituent particles shaped as freestanding knots and handlebodies of different genus, have been recently introduced. Here we develop a topological class of colloids shaped as multicomponent links. Using two-photon photopolymerization, we fabricate colloidal microparticle analogs of the classic examples of links studied in the field of topology, the Hopf and Solomon links, which we disperse in nematic fluids that possess orientational ordering of anisotropic rod-like molecules. The surfaces of these particles are treated to impose tangential or perpendicular boundary conditions for the alignment of liquid crystal molecules, so that they generate a host of topologically nontrivial field and defect structures in the dispersing nematic medium, resulting in an elastic coupling between the linked constituents. The interplay between the topologies of surfaces of linked colloids and the molecular alignment field of the nematic host reveals that linking of particle rings with perpendicular boundary conditions is commonly accompanied by linking of closed singular defect loops, laying the foundations for fabricating complex composite materials with interlinking-based structural organization.

Original languageEnglish (US)
Pages (from-to)4546-4551
Number of pages6
JournalProceedings of the National Academy of Sciences of the United States of America
Volume112
Issue number15
DOIs
StatePublished - Apr 14 2015

All Science Journal Classification (ASJC) codes

  • General

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