From: Peter Lu <>
Newsgroups: milano.seminari
Subject: 25-01-2007 Phase-Separation Triggers Gelation in Short-ranged Attractive Colloids
Date: Mon, 19 Feb 2007 14:45:44 +0000 (UTC)

                                 Seminario INFM

                              Il giorno 25-01-2007
                            alle ore 15:00 in Aula G

                               Il Dott. Peter Lu
                             Universit`a di Harvard

                        terra' un seminario dal titolo:

     Phase-Separation Triggers Gelation in Short-ranged Attractive Colloids

   We present quantitative evidence that gelation is universally triggered by
       liquid-gas phase separation in colloidal systems with short-range
 polymer-induced depletion attraction. By comparing cluster-size distributions
  from confocal microscopy and molecular-dynamics simulations, we estimate the
    second virial coefficient, showing the coincidence of the experimentally
   observed gel-transition with the liquid-gas phase-separation. Our method,
 leveraging the Noro-Frenkel law of corresponding states, is independent of the
  attractive potential`s shape, thereby providing a way to both quantitatively
 test theoretical depletion models, and to investigate thermodynamic quantities
          in systems where the potential is not readily characterized.

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