Critical Casimir interaction of ellipsoidal colloids with a planar wall

Abstract

Based on renormalization group concepts and explicit mean field calculations we study the universal contribution to the effective force and torque acting on an ellipsoidal colloidal particle which is dissolved in a critical fluid and is close to a homogeneous planar substrate. At the same closest distance between the substrate and the surface of the particle, the ellipsoidal particle prefers an orientation parallel to the substrate and the magnitude of the fluctuation induced force is larger than if the orientation of the particle is perpendicular to the substrate. The sign of the critical torque acting on the ellipsoidal particle depends on the type of boundary conditions for the order parameter at the particle and substrate surfaces, and on the pivot with respect to which the particle rotates.

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• Phase behavior of colloidal suspensions with critical solvents in terms of effective interactions
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• Alignment of cylindrical colloids near chemically patterned substrates induced by critical Casimir torques
• Critical Casimir Interactions Between Spherical Particles in the Presence of the Bulk Ordering Fields
• Forces exerted by a correlated fluid on embedded inclusions
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• Critical Casimir interaction between colloidal Janus-type particles in two spatial dimensions
• Effective Pair Interaction of Patchy Particles in Critical Fluids
• Probing interface localization-delocalization transitions by colloids
• Sign change in the net force in sphere-plate and sphere-sphere systems immersed in nonpolar critical fluid due to the interplay between the critical Casimir and dispersion van der Waals forces
• Casimir interaction of rod-like particles in a two-dimensional critical system
• Effective interaction between a colloid and a soft interface near criticality
• Bridging transitions and capillary forces for colloids in a slit
• Correlations and forces in sheared fluids with or without quenching
• Critical Casimir forces between planar and crenellated surfaces
• The square lattice Ising model on the rectangle III: Hankel and Toeplitz determinants
• Critical Casimir Interactions and Percolation: the quantitative description of critical fluctuations
• Complex orientation dependence of Casimir-Polder interaction induced by curvature and optical properties of the surface and the surrounding medium
• Fluctuation-Induced Interactions Between Ellipsoidal Particle and Planar Substrate Immersed in Critical Medium