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Shape-Dependent Oriented Trapping and Scaffolding of Plasmonic Nanoparticles by Topological Defects for Self-Assembly of Colloidal Dimers in Liquid Crystals
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posted on 2016-02-22, 06:36 authored by Bohdan Senyuk, Julian
S. Evans, Paul J. Ackerman, Taewoo Lee, Pramit Manna, Leonid Vigderman, Eugene R. Zubarev, Jao van de Lagemaat, Ivan I. SmalyukhWe demonstrate scaffolding of plasmonic nanoparticles
by topological
defects induced by colloidal microspheres to match their surface boundary
conditions with a uniform far-field alignment in a liquid crystal
host. Displacing energetically costly liquid crystal regions of reduced
order, anisotropic nanoparticles with concave or convex shapes not
only stably localize in defects but also self-orient with respect
to the microsphere surface. Using laser tweezers, we manipulate the
ensuing nanoparticle-microsphere colloidal dimers, probing the strength
of elastic binding and demonstrating self-assembly of hierarchical
colloidal superstructures such as chains and arrays.
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Scaffoldingmicrosphere surfacetopological defectsarrayLiquid Crystalsstrengthscaffoldingplasmonic nanoparticlesstablycrystal hostlaser tweezerscrystal regionsuniform far-field alignmentnanoparticle-microsphereanisotropic nanoparticlesdimersShape-Dependent Oriented TrappingbindingTopological DefectsDisplacingself-orientself-assemblyColloidal DimersPlasmonic Nanoparticlessuperstructuresurface boundary conditionsSelf-Assembly
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