We investigate critical phenomena in colloids by means of the renormalization-group based hierarchical reference theory of fluids. We focus on three experimentally relevant model systems: namely, the Asakura-Oosawa model of a colloidal dispersion under the influence of polymer-induced attractive depletion forces; fluids with competing short-range attractive and longer-range repulsive interactions; solutions of star polymers whose pair potential presents both an attractive well and an ultrasoft repulsion at shorter distance. Our results show that the ability to tune the effective interactions between colloidal particles allows one to generate a variety of crossovers to the asymptotic critical behavior, which are not observed in atomic fluids.

Nonuniversal routes to universality : critical phenomena in colloidal dispersions / D. Pini, F. Lo Verso, M. Tau, A. Parola, L. Reatto. - In: PHYSICAL REVIEW LETTERS. - ISSN 0031-9007. - 100:5(2008 Feb 08), pp. 055703.055703.1-055703.055703.4. [10.1103/PhysRevLett.100.055703]

Nonuniversal routes to universality : critical phenomena in colloidal dispersions

D. Pini
Primo
;
F.G. LO VERSO
Secondo
;
L. Reatto
Ultimo
2008

Abstract

We investigate critical phenomena in colloids by means of the renormalization-group based hierarchical reference theory of fluids. We focus on three experimentally relevant model systems: namely, the Asakura-Oosawa model of a colloidal dispersion under the influence of polymer-induced attractive depletion forces; fluids with competing short-range attractive and longer-range repulsive interactions; solutions of star polymers whose pair potential presents both an attractive well and an ultrasoft repulsion at shorter distance. Our results show that the ability to tune the effective interactions between colloidal particles allows one to generate a variety of crossovers to the asymptotic critical behavior, which are not observed in atomic fluids.
critical behavior ; competing interactions ; polymer mixtures ; star polymers
Settore FIS/03 - Fisica della Materia
8-feb-2008
Article (author)
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/2434/41272
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