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CPP: Fachverband Chemische Physik und Polymerphysik

CPP 12: Poster: Colloids and Complex Fluids

CPP 12.11: Poster

Montag, 7. März 2016, 18:15–21:00, Poster B2

Self-Assembly in Dipolar Fluids — •Michela Ronti and Sofia Kantorovich — University of Vienna, Austria

We study low temperature and low density phase behaviour of Dipolar Hard Spheres (DHS) systems. From a theoretical point of view the process of self-assembly is not responsible for a phase transition; this belief was completely reverted by theoretical studies showing that the process of self-assembly is alone capable to induce phase transition(1). On the other hand in the last years it was proved that no sign of critical behaviour is observed, implementing efficient and tailored Monte Carlo algorithms(2). Moreover a theoretical approach based on Density Functional Theory was developed: a series of structural transitions were discovered providing evidence of a hierarchy in the structures on cooling (chains, rings, branched structures)(3). We perform free-energy calculations in order to draw the phase diagram of DHS model. Comparing the numerical results with the theoretical ones shed light on the scenario of temperature induced structural transitions in magnetic nano colloids.

(1) T.Tlusty and S.A.Safran, Science 290 (2000) (2) L.Rovigatti, J.Russo and F.Sciortino, Soft Matter 8 (2012) (3) S.S.Kantorovich, A.O.Ivanov, L.Rovigatti, J.M.Tavares and F.Sciortino, Phys. Chem. Chem. Phys. 17, 16601 (2015)