Quantum Fluids in Nanopores

We describe calculations of the properties of quantum fluids inside nanotubes of various sizes. Very small radius (R) pores confine the gases to a line, so that a one-dimensional (1D) approximation is applicable; the low temperature behavior of 1D He is discussed. Somewhat larger pores permit the particles to move off axis, resulting eventually in a transition to a cylindrical shell phase—a thin film near the tube wall; we explored this behavior for H2. At even larger R ∼ 1 nm, both the shell phase and an axial phase are present. Results showing strong binding of cylindrical liquids He and He are discussed.