7 research outputs found
A confocal microscopic study on biofilm formed by Pseudomonas spp. isolated from lower respiratory tract infection from HIV and non-HIV populations
Reentrant Phase Transition in Charged Colloidal Suspensions
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. 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