Phase transformations of water in porous glass

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Journal titleJournal of Physical Chemistry
Pages27542764; # of pages: 11
Subjectglasses (materials); phase transformation; porosity; water; freezing point
AbstractThe system porous glass saturated with respect to water was studied in the temperature range +2 to -40 degrees. Calorimetric measurements with simultaneous observations on length changes revealed that two kinds of transformations took place at different temperatures below the normal melting point of bulk water. The amount of water that did not transform when this system was cooled to about -40 degrees is shown to correspond to approximately three monolayers. The experimental results suggest that the adsorbed water in porous glass even in the middle of the capillaries has a different state from that of bulk water, and it is concluded that the observed depression of the freezing point should be considered in terms of the different structure the adsorbate acquires from that of the bulk state.
Publication date
AffiliationNRC Institute for Research in Construction; National Research Council Canada
Peer reviewedNo
NRC number8270
NPARC number20375927
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Record identifier421eccdf-3c4f-47ce-bf4f-6dc33058fdad
Record created2012-07-23
Record modified2016-05-09
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