Critical Casimir Interactions Between Spherical Particles in the Presence of the Bulk Ordering Fields

Abstract

The spatial suppression of order parameter fluctuations in a critical media produces Critical Casimir forces acting on confining surfaces. This scenario is realized in a critical binary mixture near the demixing transition point that corresponds to the second order phase transition of the Ising universality class. Due to these critical interactions similar colloids, immersed in a critical binary mixture near the consolute point, exhibit attraction. The numerical method for computation of the interaction potential between two spherical particles using Monte Carlo simulations for the Ising model is proposed. This method is based on the integration of the local magnetization over the applied local magnetic field. For the stronger interaction the concentration of the component of the mixture that does not wet colloidal particles, should be larger, than the critical concentration. The strongest amplitude of the interactions is observed below the critical point.

7 pages, 4 figures

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Cited by in corpus (6)

• Critical Casimir Effect: Exact Results
• Thermodynamic Casimir Effect in Films: the Exchange Cluster Algorithm
• Liquid bridging of cylindrical colloids in near-critical solvents
• Critical Casimir force scaling functions of the two-dimensional Ising model at finite aspect ratios
• Exact results for the behavior of the thermodynamic Casimir force in a model with a strong adsorption
• Probing interface localization-delocalization transitions by colloids