Nematic phase transitions in mixtures of thin and thick colloidal rods

Kirstin R. Purdy, S. Varga, Amparo Galindo, George Jackson, Seth Fraden

Research output: Contribution to journalArticle

60 Citations (Scopus)

Abstract

We report experimental measurements of the phase behavior of mixtures of thin (charged semiflexible f d virus) and thick (f d-PEG, f d virus covalently coated with polyethylene glycol) rods with diameter ratio varying from 3.7 to 1.1. The phase diagrams of the rod mixtures reveal isotropic-nematic, isotropicnematic-nematic, and nematic-nematic coexisting phases with increasing concentration. In stark contrast to predictions from earlier theoretical work, we observe a nematic-nematic coexistence region bound by a lower critical point. Moreover, we show that a rescaled Onsager-type theory for binary hard-rod mixtures qualitatively describes the observed phase behavior.

Original languageEnglish
Article number057801
JournalPhysical Review Letters
Volume94
Issue number5
DOIs
Publication statusPublished - Feb 11 2005

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Phase Transition
rods
viruses
Viruses
glycols
polyethylenes
critical point
phase diagrams
predictions

ASJC Scopus subject areas

  • Physics and Astronomy(all)
  • Medicine(all)

Cite this

Nematic phase transitions in mixtures of thin and thick colloidal rods. / Purdy, Kirstin R.; Varga, S.; Galindo, Amparo; Jackson, George; Fraden, Seth.

In: Physical Review Letters, Vol. 94, No. 5, 057801, 11.02.2005.

Research output: Contribution to journalArticle

Purdy, Kirstin R. ; Varga, S. ; Galindo, Amparo ; Jackson, George ; Fraden, Seth. / Nematic phase transitions in mixtures of thin and thick colloidal rods. In: Physical Review Letters. 2005 ; Vol. 94, No. 5.
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