Journal
SOFT MATTER
Volume 6, Issue 21, Pages 5476-5481Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c0sm00437e
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- [J1-9728Slovenian Research Agency]
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The topological properties and interactions of nano colloids in the nematic liquid crystal pentylcyanobiphenyl (5CB) have been studied. We find that silica particles, surface-functionalized with N,N-dimethyl-N-octadecyl-3-aminopropyl trimethoxysilyl chloride induce a dipolar structure of 5CB around them even for 125 nm diameter colloids. The 125 nm dipolar colloidal particle is accompanied by a clearly resolvable hyperbolic point defect and behaves hydrodynamically as a much bigger particle because of the elastic distortion around it. This has a surprising consequence that the pair-binding energy of the dipolar nanocolloids is as high as 700 k(B)T for 125 nm colloids and is practically size-independent in the range from 125 nm to 500 nm.
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