The geometry of walls forming a narrow pore may qualitatively affect the phase behavior of the confined fluid. Specifically, the nature of condensation in nanopores formed of sinusoidally shaped walls (with amplitude A and period P) is governed by the wall mean separation L as follows. For L>L_{t}, where L_{t} increases with A, the pores exhibit standard capillary condensation similar to planar slits. In contrast, for L

Department of Physical Chemistry University of Chemical Technology Prague Praha 6 166 28 Czech Republic and The Czech Academy of Sciences Institute of Chemical Process Fundamentals Department of Molecular Modelling 165 02 Prague Czech Republic

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Multiple Meniscus Depinning Transitions in Open Capillary Slits