Phase behaviour of water confined in Vycor glass at high temperatures and pressures

Abstract

The phase behaviour of water confined in porous Vycor glass is investigatedby means of dielectric measurements. The effective static permittivityεeff(0) of the sample, which consists of Vycor glass and water confined in the pores, is obtainedover a wide range of temperature and pressure. The boiling point of the confined water ishigher than that of bulk water by K. The enthalpy of vaporization for confined water is practically the same as that forbulk water. The critical point of the confined water is determined as lying atTcH2O/V ycor = 623(± 3) Kand PcH2O/V ycor = 14(± 1.5) MPa; both of these values are lower than those for bulk water.