Casimir Effect in Fluids above the Isotropic-Lamellar Transition

Details Casimir Effect in Fluids above the Isotropic-Lamellar Transition Casimir Effect in Fluids above the Isotropic-Lamellar Transition

2001-04-23

arxiv.org/abs/cond-mat/0104419v3

Phys. Rev. Lett. 87, 216101 (2001)

Physics

Condensed Matter

Soft Condensed Matter

4 pages, 2 figures; published version

Scientific paper

10.1103/PhysRevLett.87.216101

We study fluctuation-induced interaction in confined fluids above the isotropic-lamellar transition. At an ideal continuous transition, the disjoining pressure has the asymptotic form $\Pi(d\to\infty)\approx -C k_BT q_0^2/d$, where $d$ is the interwall distance, $q_0$ is the wavenumber of the scattering peak, and $C= 1/(4\pi)$ in the strong anchoring limit. The long-rangedness is enhanced due to continuous distribution of soft modes in the ${\bf q}$-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.

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