Casimir effect in fluids above the isotropic-lamellar transition

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We study fluctuation-induced interaction in confined fluids above the isotropic-lamellar transition. At an ideally continuous transition, the disjoining pressure has the asymptotic form Π(d→∞)≈−CkBTq20/d, where d is the interwall distance, q0 is the wave number of the scattering peak, and C = 1/4π in the strong anchoring limit. The long-rangedness is enhanced due to continuous distribution of soft modes in the q space. An unconventionally strong Casimir force with a range of several lamella thicknesses is realistic above the transition. We also find an oscillatory force profile near a surface-induced transition.

Original languageEnglish
Pages (from-to)216101-1-216101-4
JournalPhysical Review Letters
Issue number21
Publication statusPublished - 2001 Nov 19


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