Crystallographic phase induced electro-optic properties of nanorod blend nematic liquid crystal

Sudarshan Kundu, Jonathan P. Hill, Gary J. Richards, Katsuhiko Ariga, Ali Hossain Khan, Umamahesh Thupakula, Somobrata Acharya

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Ultrasmall ZnS or PbS nanorods encapsulated in fluid-like soft organic surfactants show excellent miscibility in the nematic liquid crystal (LC ZLI-4792) host resulting in a novel soft matter type blend with enhanced electro-optic properties. The ultranarrow ZnS rods are of wurtzite phase and possess a chemical bipolarity and a net dipole moment. The centrosymmetric ultranarrow PbS rods possess a finite size and shape dependent inherent dipole moment despite their cubic rocksalt structure. When an electric field is applied, the blend aligns along the direction of the field producing a local unidirectional orientation of the rods and LC directors, and defining a unique axis for the system. The local ordering significantly affects the global ordering of the blend allowing a more rapid response of the electro-optic properties. The degree and switching speed of the blends depend upon the magnitude of dipole moments present in the dopant nanorods. We show how a non-mesogenic element designed with preferential crystallographic phase can be introduced within a LC for improvement of the switching properties of the LC blend. These types of unique blends are a model for fundamental conceptual advances in general understanding of interaction behaviour leading consequently to a significant technological advancement for superior device fabrication.

Original languageEnglish
Pages (from-to)7729-7734
Number of pages6
JournalJournal of Nanoscience and Nanotechnology
Volume11
Issue number9
DOIs
Publication statusPublished - 2011 Sep
Externally publishedYes

Keywords

  • Blend
  • Electro-optic properties
  • Nematic liquid crystal
  • Ultranarrow ZnS and PbS Nanorods
  • Wurtzite and rock-salt crystallographic phases

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Biomedical Engineering
  • Materials Science(all)
  • Condensed Matter Physics

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