Heat capacity of tetrahydrofuran clathrate hydrate and of its components, and the clathrate formation from supercooled melt. (Articolo in rivista)

Type

• Articolo in rivista (Classe)
• Prodotto della ricerca (Classe)

Label

• Heat capacity of tetrahydrofuran clathrate hydrate and of its components, and the clathrate formation from supercooled melt. (Articolo in rivista) (literal)

Anno

• 2006-01-01T00:00:00+01:00 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#doi

• 10.1063/1.2188944 (literal)

Alternative label

• Tombari E. (1); Presto S. (2); Salvetti G. (1); Johari G.P. (3) (2006)
  Heat capacity of tetrahydrofuran clathrate hydrate and of its components, and the clathrate formation from supercooled melt.
  in The Journal of chemical physics
  (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#autori

• Tombari E. (1); Presto S. (2); Salvetti G. (1); Johari G.P. (3) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#url

• http://jcp.aip.org/ (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroVolume

• 124 (literal)

Rivista

• ?The ?Journal of chemical physics (Rivista)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#note

• Art. No. 154507 (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#numeroFascicolo

• 5 (literal)

Note

• ISI Web of Science (WOS) (literal)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#affiliazioni

• (1) IPCF - CNR (2) Università di Genova (3) McMaster Univ, Dept Mat Sci & Engn, Hamilton, ON L8S 4L7 Canada (literal)

Titolo

• Heat capacity of tetrahydrofuran clathrate hydrate and of its components, and the clathrate formation from supercooled melt. (literal)

Abstract

• We report a thermodynamic study of the formation of tetrahydrofuran clathrate hydrate by explosive crystallization of water-deficient, near stoichiometric, and water-rich solutions, as well as of the heat capacity, C-p, of (i) supercooled tetrahydrofuran-H2O solutions and of the clathrate hydrate, (ii) tetrathydrofuran (THF) liquid, and (iii) supercooled water and the ice formed on its explosive crystallization. In explosive freezing of supercooled solutions at a temperature below 257 K, THF clathrate hydrate formed first. The nucleation temperature depends on the cooling rate, and excess water freezes on further cooling. The clathrate hydrate melts reversibly at 277 K and C-p increases by 770 J/mol K on melting. The enthalpy of melting is 99.5 kJ/mol and entropy is 358 J/mol K. Molar C-p of the empty host lattice is less than that of the ice, which is inconsistent with the known lower phonon frequency of H2O in the clathrate lattice. Analysis shows that C-p of THF and ice are not additive in the clathrate. C-p of the supercooled THF-H2O solutions is the same as that of water at 247 K, but less at lower temperatures and more at higher temperatures. The difference tends to become constant at 283 K. The results are discussed in terms of the hydrogen-bonding changes between THF and H2O. (literal)

Prodotto di

• Termodinamica e caratterizzazione dei materiali (MD.P01.010.001) (Modulo)
• Istituto per i processi chimico-fisici (IPCF) (Istituto)

Autore CNR

• ELPIDIO TOMBARI (Unità di personale interno)
• GIUSEPPE SALVETTI (Unità di personale interno)

Insieme di parole chiave

• Parole chiave di "Heat capacity of tetrahydrofuran clathrate hydrate and of its components, and the clathrate formation from supercooled melt." (Insieme di parole chiave)

Incoming links:

Prodotto

• Istituto per i processi chimico-fisici (IPCF) (Istituto)
• Termodinamica e caratterizzazione dei materiali (MD.P01.010.001) (Modulo)

Autore CNR di

• ELPIDIO TOMBARI (Unità di personale interno)
• GIUSEPPE SALVETTI (Unità di personale interno)

Http://www.cnr.it/ontology/cnr/pubblicazioni.owl#rivistaDi

• ?The ?Journal of chemical physics (Rivista)

Insieme di parole chiave di

• Parole chiave di "Heat capacity of tetrahydrofuran clathrate hydrate and of its components, and the clathrate formation from supercooled melt." (Insieme di parole chiave)