Electro-induced orientational ordering of anisotropic pigment nanoparticles

Robert J. Greasty*, Robert M. Richardson, Susanne Klein, David Cherns, Michael R. Thomas, Claire Pizzey, Nick Terrill, Cyrille Rochas

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingChapter in a book


The response of anisotropic pigment particle suspensions to externally applied electric fields has been explored for possible application in reflective display technologies. Three different types of pigment particle were suspended in dodecane using a polymeric stabiliser and showed Schlieren textures between crossed polarisers at high concentrations (>25-30 wt%), indicating the formation of colloidal nematic phases. Orientational order parameters were determined by X-ray scattering and the influence of polydispersity on the values is discussed. X-ray scattering measurements also demonstrated a change in the structure factor consistent with the onset of a colloidal nematic phase. In addition, the pigment particles were dispersed into various liquid crystal hosts at low concentrations (

Original languageEnglish
Title of host publicationHP Laboratories Technical Report
Publication statusPublished - 2013


  • Anisotropic pigment nanoparticles
  • Colloids
  • Electric field alignment
  • Liquid crystals
  • X-ray scattering


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