Long-ranged correlations in a fluid close to its critical point Tc cause distinct forces between immersed colloidal particles and the container walls. We calculate such a force and its temperature dependence for the generic case of a spherical particle located at a distance D from a planar wall and find that the force attains a maximum at a temperature Tmax(D) above Tc, which facilitates quantitative experimental tests. The corresponding effective pair interaction between the colloidal particles themselves, potentially leading to aggregation, is also discussed.
Hanke, Andreas; Schlesener, F.; Eisenriegler, E.; and Dietrich, S., "Critical Casimir Forces between Spherical Particles in Fluids" (1998). Physics and Astronomy Faculty Publications and Presentations. 388.
Physical Review Letters