Premium
Phase Diagram of Electrostricted H 2 O at Surfaces of Electrodes at 273–373 K: Electric Critical Point of Water
Author(s) -
DanielewiczFerchmin Irena,
Ferchmin A. Ryszard
Publication year - 2005
Publication title -
chemphyschem
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.016
H-Index - 140
eISSN - 1439-7641
pISSN - 1439-4235
DOI - 10.1002/cphc.200500106
Subject(s) - phase diagram , electrostriction , critical point (mathematics) , electric field , phase transition , electrolyte , chemistry , phase (matter) , electrode , condensed matter physics , analytical chemistry (journal) , thermodynamics , materials science , physics , geometry , mathematics , quantum mechanics , organic chemistry , chromatography , piezoelectricity , composite material
Abstract The equation of state of an open system containing water in an electric field of strength E greater than 10 8 V m −1 leads to a phase diagram with two‐phase and single‐phase regions in the Π,E,T coordinates ( Π =electrostriction pressure). The phases differ by their degree of orientation of H 2 O molecules in the field. The phase transition is discontinuous with respect to E . The calculation shows that the discontinuity vanishes at the critical point: Π c ≈0.2 GPa, E c ≈10 9 V m −1 and ${{\rm T}{{{\rm E}\hfill \atop c\hfill}}}$ below 313 K. The thermal effect of the transition is calculated and compared with an experiment at the Hg/aqueous electrolyte interface found in the literature.