Density minimum in the isotropic-nematic transition of hard cut-spheres

Fartaria, Rui P.S. and Sweatman, M.B. (2009) Density minimum in the isotropic-nematic transition of hard cut-spheres. Chemical Physics Letters, 478 (4-6). pp. 150-154. ISSN 0009-2614

Abstract

We study the isotropic-nematic transition of hard cut-spheres over a wide range of aspect ratios using Monte Carlo simulation and umbrella sampling. We find a minimum in the density of both coexisting phases near to L/D=0.04 (thickness/diameter) and show that this minimum is a result of competition between the solid volume of the disks and the free volume which is significantly influenced by nematic pre-ordering in the isotropic phase. We expect similar behaviour for other kinds of discotic particles. This behaviour should be observed as a kind of 'partially re-entrant' isotropic phase for discotic mesogens within an appropriate concentration range.

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  Item type:	Article
  ID code:	13467
  Dates:	Date Event 27 August 2009 Published
  Keywords:	density, isotropic-nematic transition, hard cut-spheres, chemical engineering, Chemical technology, Engineering (General). Civil engineering (General), Physics, Physics and Astronomy(all), Physical and Theoretical Chemistry
  Subjects:	Technology > Chemical technology Technology > Engineering (General). Civil engineering (General) Science > Physics
  Department:	Faculty of Engineering > Chemical and Process Engineering
  Depositing user:	Dr Martin Sweatman
  Date deposited:	19 Nov 2009 15:30
  Last modified:	20 Jan 2021 18:16
  URI:	https://strathprints.strath.ac.uk/id/eprint/13467