Observation of the density minimum in deeply supercooled confined water
Resource
Proceedings of the National Academy of Sciences 104 (23): 9570-9574
Journal
Proceedings of the National Academy of Sciences of the United States of America
Journal Volume
104
Journal Issue
23
Pages
9570-9574
Date Issued
2007
Author(s)
Abstract
Small angle neutron scattering (SANS) is used to measure the density of heavy water contained in 1D cylindrical pores of mesoporous silica material MCM-41-S-15, with pores of diameter of 15 ± 1 Å. 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 D 2 O as a function of temperature. We observe a density minimum at 210 ± 5 K with a value of 1.041 ± 0.003 g/cm 3 . We show that the results are consistent with the predictions of molecular dynamics simulations of supercooled bulk water. Here we present an experimental report of the existence of the density minimum in supercooled water, which has not been described previously.
SDGs
Type
journal article
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