Abstract
Water confined within nanopores exhibits the melting point depression, that is described with the Gibbs-
Thomson (GT) equation. Generally, the confined water follows the GT equation, but if the pore has different
pore-wall or shape, the equation cannot expect the freezing behavior of the confined water. Recently,
calorimetry studies have demonstrated how the confined water is affected by the pore properties such as porecrystallinity,
size, and shape. Within cylindrical crystalline pores, the internal water recovers the intrinsic
hydrogen-bond network, which is independent of the arrangement of the molecules in the pore-wall unlike the
interfacial water, with increase in pore size. Moreover, within amorphous slit-pores, the internal water exhibits
higher melting points than those within amorphous cylindrical pores. Still it remains to be seen whether the
hydrogen-bond structure of the confined water depends on anisotropy of pores.
