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Abstract: We experimentally demonstrate that critical Casimir forces in colloidalsystems can be continuously tuned by the choice of boundary conditions. Theinteraction potential of a colloidal particle in a mixture of water and2,6-lutidine has been measured above a substrate with a gradient in itspreferential adsorption properties for the mixture-s components. We find thatthe interaction potentials at constant temperature but different positionsrelative to the gradient continuously change from attraction to repulsion. Thisdemonstrates that critical Casimir forces respond not only to minutetemperature changes but also to small changes in the surface properties.



Author: Ursula Nellen, Laurent Helden, Clemens Bechinger

Source: https://arxiv.org/



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