Supercooling of aqueous dimethylsulfoxide solution at normal and high pressures: Evidence for the coexistence of phase-separated aqueous dimethylsulfoxide solutions of different water structures.
J Chem Phys
; 132(19): 194503, 2010 May 21.
Article
en En
| MEDLINE
| ID: mdl-20499975
Supercooling behavior of aqueous dimethylsulfoxide (DMSO) solution was investigated as a function of DMSO concentration and at high pressures. A linear relationship was observed for T(H) (homogeneous ice nucleation temperature) and T(m) (melting temperature) for the supercooling of aqueous DMSO solution at normal pressure. Analysis of the DTA (differential thermal analysis) traces for homogeneous ice crystallization in the bottom region of the T(H) curve for a DMSO solution of R=20 (R: moles of water/moles of DMSO) at high pressures supported the contention that the second critical point (SCP) of liquid water should exist at P(c2)= approximately 200 MPa and at T(c2)<-100 degrees C (P(c2): pressure of SCP, T(c2): temperature of SCP). The presence of two T(H) peaks for DMSO solutions (R=15, 12, and 10) suggests that phase separation occurs in aqueous DMSO solution (R
Asunto(s)
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Dimetilsulfóxido
/
Congelación
Idioma:
En
Revista:
J Chem Phys
Año:
2010
Tipo del documento:
Article
País de afiliación:
Japón
Pais de publicación:
Estados Unidos
Texto completo:
1
Colección:
01-internacional
Base de datos:
MEDLINE
Asunto principal:
Dimetilsulfóxido
/
Congelación
Idioma:
En
Revista:
J Chem Phys
Año:
2010
Tipo del documento:
Article
País de afiliación:
Japón
Pais de publicación:
Estados Unidos