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20 April 2024

» arxiv » 1612.7443

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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
Bohdan Senyuk ; Julian S. Evans ; Paul J. Ackerman ; Taewoo Lee ; Pramit Manna ; Leonid Vigderman ; Eugene R. Zubarev ; Jao van de Lagemaat ; Ivan I. Smalyukh ;
Date:	22 Dec 2016
Abstract:	We 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.
Source:	arXiv, 1612.7443
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