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Titolo:
HYDRATION OF IONS IN AQUEOUS-ELECTROLYTE SOLUTIONS STUDIED BY DIFFERENTIAL THERMAL-ANALYSIS AT LOW-TEMPERATURES
Autore:
KAWAI T; LEE YM; NAKAJIMA K; EHARA K;
Indirizzi:
HANYANG UNIV,COLL ENGN,DEPT IND CHEM SEOUL 133791 SOUTH KOREA HANYANG UNIV,COLL ENGN,DEPT IND CHEM SEOUL 133791 SOUTH KOREA TOKYO INST TECHNOL,FAC ENGN,DEPT POLYMER ENGN,MEGURO KU TOKYO 152 JAPAN
Titolo Testata:
Journal of electroanalytical chemistry [1992]
fascicolo: 1-2, volume: 422, anno: 1997,
pagine: 133 - 138
Fonte:
ISI
Lingua:
ENG
Keywords:
HYDRATION; WATER STRUCTURE; AQUEOUS ELECTROLYTE; DTA; SOLVATION;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Science Citation Index Expanded
Citazioni:
22
Recensione:
Indirizzi per estratti:
Citazione:
T. Kawai et al., "HYDRATION OF IONS IN AQUEOUS-ELECTROLYTE SOLUTIONS STUDIED BY DIFFERENTIAL THERMAL-ANALYSIS AT LOW-TEMPERATURES", Journal of electroanalytical chemistry [1992], 422(1-2), 1997, pp. 133-138

Abstract

In order to study the hydration of ions in aqueous electrolyte solution, the freezing and successive heating behavior was examined by meansof differential thermal analysis. Li+ and Na+ ions as structure-forming ions, and K+ and Cs+ ions as structure-breaking ions, were chosen with NH4+ as an intermediate case. The anion was Cl-. On successive cooling and heating of the solutions, two freezing and melting peaks appeared respectively, except for LiCl solutions. The lower temperature peak (peak I) is considered to be the freezing and melting of the free water, while the higher temperature peak (peak II) corresponds to freezing and melting of the primary and secondary hydration regions: It could be proved that the single peak which appears for LiCl is attributable to the freezing and melting of the free water, since the hydrated region remained unfrozen due to supercooling. From the relative areas of the peaks I and II, the primary plus secondary solvation numbers could be estimated. The dependence of the total solvation number on the salt concentration is considered as due to the change in the secondary solvation number.

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Documento generato il 25/11/20 alle ore 08:23:39