The dynamic and thermodynamic properties of molecular systems are known to be modified by confinement in very small spaces. However, making explicit and unambiguous connections between the geometry of the confining space and the molecular behavior has proven to be difficult, and the connections, when made, are frequently controversial. Nonetheless studies show that within a family of similarly prepared porous materials, the effect of finite size on the behavior of confined liquids and gases scales with a single geometric property of the pore space.
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