Tunability of Critical Casimir Interactions by Boundary Conditions

Details Tunability of Critical Casimir Interactions by Boundary Conditions Tunability of Critical Casimir Interactions by Boundary Conditions

2009-10-13

arxiv.org/abs/0910.2373v1

EPL 88 (2009) 26001

Physics

Condensed Matter

Soft Condensed Matter

4 figures; http://www.iop.org/EJ/article/0295-5075/88/2/26001/epl_88_2_26001.html

Scientific paper

10.1209/0295-5075/88/26001

We experimentally demonstrate that critical Casimir forces in colloidal systems can be continuously tuned by the choice of boundary conditions. The interaction potential of a colloidal particle in a mixture of water and 2,6-lutidine has been measured above a substrate with a gradient in its preferential adsorption properties for the mixture's components. We find that the interaction potentials at constant temperature but different positions relative to the gradient continuously change from attraction to repulsion. This demonstrates that critical Casimir forces respond not only to minute temperature changes but also to small changes in the surface properties.

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