Normal and lateral critical Casimir forces between colloids and patterned substrates

Details Normal and lateral critical Casimir forces between colloids and patterned substrates Normal and lateral critical Casimir forces between colloids and patterned substrates

2009-03-12

arxiv.org/abs/0903.2113v2

Europhysics Letters, 88 (2009) 40004

Physics

Condensed Matter

Soft Condensed Matter

6 pages, 3 figures

Scientific paper

10.1209/0295-5075/88/40004

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.

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