Observation of the Density Minimum in Deeply Supercooled Confined Water

Details Observation of the Density Minimum in Deeply Supercooled Confined Water Observation of the Density Minimum in Deeply Supercooled Confined Water

2007-04-17

arxiv.org/abs/0704.2221v1

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1073/pnas.0701352104

Small angle neutron scattering (SANS) is used to measure the density of heavy water contained in 1-D cylindrical pores of mesoporous silica material MCM-41-S-15, with pores of diameter of 15+-1 A. In these pores the homogenous nucleation process of bulk water at 235 K does not occur and the liquid can be supercooled down to at least 160 K. The analysis of SANS data allows us to determine the absolute value of the density of D2O as a function of temperature. We observe a density minimum at 210+-5 K with a value of 1.041+-0.003 g/cm3. We show that the results are consistent with the predictions of molecular dynamics simulations of supercooled bulk water. This is the first experimental report of the existence of the density minimum in supercooled water.

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