Wetting controlled phase transitions in two-dimensional systems of colloids



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Gil, Tamir and Ipsen, John Hjort and Fernández Tejero, Carlos (1998) Wetting controlled phase transitions in two-dimensional systems of colloids. Physical Review E, 57 (3 - Pa). pp. 3123-3133. ISSN 1063-651X

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Official URL: http://dx.doi.org/10.1103/PhysRevE.57.3123


The phase behavior of disk colloids, embedded in a two-dimensional fluid matrix that undergoes a first-order phase transition, is studied in the complete wetting regime where the thermodynamically metastable fluid phase is stabilized at the surface of the disks. In dilute collections of disks, the tendency to minimize the extent of the fluid-fluid interface and the extent of the unfavorable wetting phase in the system gives rise to aggregation phenomena and to separation of large domains of disks that have the characteristics of bulk colloidal phases. The conditions for phase transitions among cluster gas, liquid, and solid phases of the disk colloids are determined from the corresponding values of the disk chemical potential within an analytic representation of the grand partition function for the excess energy associated with a gas of disk clusters in the low-disk-density limit. The wetting effective-interface potential is combined with the disk interaction potential in associating an internal energy with each one of the clusters. The theory can thus be applied to any type of interaction potential among disks, provided that the free energy associated with the corresponding bulk colloidal phases is available. A phase diagram is calculated explicitly for the case of hard disks on the basis of an analytical approximation for the free energy of the hard disk fluid phase and the generalized effective liquid approximation for the free energy of the hard disk solid phase.

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© 1998 The American Physical Society. Ling Miao and Jens Risbo are gratefully acknowledged for enlightening discussions and suggestions. T.G. acknowledges the hospitality of the Departamento de Física Aplicada I, Universidad Complutense de Madrid. C.F.T. acknowledges financial support from DGICYT (Spain) Grant No. PB94-0265. This work was supported by the Danish Natural Science Research Council under Grant No. 9400091

Uncontrolled Keywords:Liquid; Separation; Equation
Subjects:Sciences > Physics > Thermodynamics
ID Code:23797
Deposited On:10 Dec 2013 15:13
Last Modified:02 Nov 2015 14:12

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