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Linked topological colloids in a nematic host.

Angel Martinez1, Leonardo Hermosillo2, Mykola Tasinkevych3

  • 1Department of Physics, University of Colorado Boulder, Boulder, CO 80309; Theory of Inhomogeneous Condensed Matte, Liquid Crystal Materials Research Center, University of Colorado Boulder, Boulder, CO 80309;

Proceedings of the National Academy of Sciences of the United States of America
|April 1, 2015
PubMed
Summary
This summary is machine-generated.

Researchers created novel multicomponent linked colloids, mimicking topological links like the Hopf and Solomon links. These particles influence liquid crystal alignment, leading to interlinked defect structures and new material possibilities.

Keywords:
Hopf and Solomon linksliquid crystalslow-dimensional topologyself-assemblytopological defects

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Area of Science:

  • Colloid Science
  • Soft Matter Physics
  • Topology

Background:

  • Particle geometry and topology significantly impact colloidal properties.
  • Previous research focused on single-component colloids with connected surfaces.
  • Recent advances introduced topological colloids with freestanding knots and handlebodies.

Purpose of the Study:

  • To develop and investigate a new class of topological colloids: multicomponent links.
  • To explore the interaction between linked colloidal particles and nematic liquid crystal hosts.
  • To understand how particle topology and boundary conditions influence emergent field structures.

Main Methods:

  • Fabrication of colloidal microparticle analogs of Hopf and Solomon links using two-photon photopolymerization.
  • Dispersion of these microparticles in nematic fluids.
  • Surface treatment of particles to control liquid crystal alignment (tangential or perpendicular boundary conditions).

Main Results:

  • The linked colloids generated topologically nontrivial field and defect structures in the nematic medium.
  • An elastic coupling was observed between the linked colloidal constituents.
  • Linking of particle rings with perpendicular boundary conditions was frequently associated with the linking of closed singular defect loops.

Conclusions:

  • The study establishes a new class of multicomponent linked colloids.
  • The interplay between particle topology and nematic host reveals complex emergent behaviors.
  • This work lays the foundation for creating advanced composite materials organized through interlinking principles.