Coexistence diameter in two-dimensional colloid-polymer mixtures

Details Coexistence diameter in two-dimensional colloid-polymer mixtures Coexistence diameter in two-dimensional colloid-polymer mixtures

2006-06-22

arxiv.org/abs/cond-mat/0606579v1

Phys. Rev. E 74, 010102(R) (2006)

Physics

Condensed Matter

Statistical Mechanics

4 pages, 4 figures, to appear in Phys. Rev. E (R)

Scientific paper

10.1103/PhysRevE.74.010102

We demonstrate that the law of the rectilinear coexistence diameter in two-dimensional (2D) mixtures of non-spherical colloids and non-adsorbing polymers is violated. Upon approach of the critical point, the diameter shows logarithmic singular behavior governed by a term t ln(t), with t the relative distance from the critical point. No sign of a term t^2b could be detected, with b the critical exponent of the order parameter, indicating a very weak or absent Yang-Yang anomaly. Our analysis thus reveals that non-spherical particle shape alone is not sufficient for the formation of a pronounced Yang-Yang anomaly in the critical behavior of fluids.

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