Normal and lateral critical Casimir forces between colloids and patterned substrates

Abstract

We study the normal and lateral effective critical Casimir forces acting on a spherical colloid immersed in a critical binary solvent and close to a chemically structured substrate with alternating adsorption preference. We calculate the universal scaling function for the corresponding potential and compare our results with recent experimental data [Soyka F., Zvyagolskaya O., Hertlein C., Helden L., and Bechinger C., Phys. Rev. Lett., 101, 208301 (2008)]. The experimental potentials are properly captured by our predictions only by accounting for geometrical details of the substrate pattern for which, according to our theory, critical Casimir forces turn out to be a sensitive probe.

6 pages, 3 figures

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• Crossover of Critical Casimir forces between different surface universality classes
• Trapping colloids near chemical stripes via critical Casimir forces
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• Critical Casimir Effect: Exact Results
• Critical Casimir forces steered by patterned substrates
• Critical Casimir forces and adsorption profiles in the presence of a chemically structured substrate
• Phase behavior of colloidal suspensions with critical solvents in terms of effective interactions
• Many-body effects for critical Casimir forces
• Alignment of cylindrical colloids near chemically patterned substrates induced by critical Casimir torques
• Critical Casimir forces between homogeneous and chemically striped surfaces
• Ensemble dependence of Critical Casimir Forces in Films with Dirichlet Boundary Conditions
• Critical Casimir force in the presence of random local adsorption preference
• Three-body critical Casimir forces
• Liquid bridging of cylindrical colloids in near-critical solvents
• Line contribution to the critical Casimir force between a homogeneous and a chemically stepped surface
• Critical Casimir Force between Inhomogeneous Boundaries
• 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
• Conformal field theory of critical Casimir forces between surfaces with alternating boundary conditions in two dimensions
• Effective interaction between a colloid and a soft interface near criticality
• Bridging transitions and capillary forces for colloids in a slit
• On The Critical Casimir Interaction Between Anisotropic Inclusions On A Membrane
• Critical Casimir forces between planar and crenellated surfaces
• The square lattice Ising model on the rectangle III: Hankel and Toeplitz determinants