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  • Title: Nematic phase transitions in mixtures of thin and thick colloidal rods.
    Author: Purdy KR, Varga S, Galindo A, Jackson G, Fraden S.
    Journal: Phys Rev Lett; 2005 Feb 11; 94(5):057801. PubMed ID: 15783700.
    Abstract:
    We report experimental measurements of the phase behavior of mixtures of thin (charged semiflexible fd virus) and thick (fd-PEG, fd 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, isotropic-nematic-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.
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