Reentrant phase transition in charged colloidal suspensions

Arora, Akhilesh K. ; Tata, B. V. R. ; Sood, A. K. ; Kesavamoorthy, R. (1988) Reentrant phase transition in charged colloidal suspensions Physical Review Letters, 60 (23). pp. 2438-2441. ISSN 0031-9007

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We report the observation of a novel phase transition in dilute aqueous suspensions of polystyrene particles as a function of ionic impurity concentration C. The suspension phase separates into dense and rare phases only for a restricted range of C which depends on particle concentration n. The dense phase has liquidlike or crystalline order depending on n and C. Free energies of the homogeneous and the phase-separated states are calculated with an effective interparticle potential. The calculated phase diagram is in qualitative agreement with the present experimental results.

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Source:Copyright of this article belongs to American Physical Society.
ID Code:50254
Deposited On:22 Jul 2011 13:41
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