Detection of early cluster formation in soft matter: an entropic imprint

Details Detection of early cluster formation in soft matter: an entropic imprint Detection of early cluster formation in soft matter: an entropic imprint

2009-03-05

arxiv.org/abs/0903.1077v2

Physics

Condensed Matter

Statistical Mechanics

Revised version of paper previously referenced as: http://arxiv.org/abs/0903.1077 (March 2009), 4 pages, 3 figures

Scientific paper

We study model protein solutions and colloidal suspensions in the temperature range whereupon the nature of the system changes from a homogeneous fluid to a "cluster fluid". It is commonly assumed - as deduced by the behavior of the structural correlations - that this microphase separation sets as a continuous process. We challenge such assumption and demonstrate that the entropy shows a discontinuous behavior across a well-defined temperature threshold, providing a neat signature of the modifications occurring in the fluid. All predictions, obtained in the framework of a refined theory of the liquid state, are systematically assessed against extensive Monte Carlo simulations. We emphasize the broad generality of our conclusions, and the importance of accurate theoretical treatments to characterize the thermodynamic properties of soft materials.

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