Tunability of critical Casimir interactions by boundary conditions

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.

• Publication year

  2009

• Venue

  EPL (Europhysics Letters)

• Publication date

  2009-10-01

• Fields of study

  Physics

• Identifiers
  DOI 10.1209/0295-5075/88/26001arXiv 0910.2373
• External record

  Open on Semantic Scholar

• Source metadata

  Semantic Scholar

• No claims are published for this paper.

• No concepts are published for this paper.

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