Catalogo Articoli (Spogli Riviste)

OPAC HELP

Titolo:
The beta-alpha branching in D-sorbitol as studied by thermally stimulated depolarization currents (TSDC)
Autore:
Correia, NT; Alvarez, C; Ramos, JJM; Descamps, M;
Indirizzi:
IST, Ctr Quim Fis Mol, P-1049001 Lisbon, Portugal IST Lisbon Portugal P-1049001 r Quim Fis Mol, P-1049001 Lisbon, Portugal UFR Phys, Lab Dynam & Struct Mat Mol, F-59655 Villeneuve Dascq, France UFRPhys Villeneuve Dascq France F-59655 -59655 Villeneuve Dascq, France
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 24, volume: 105, anno: 2001,
pagine: 5663 - 5669
SICI:
1520-6106(20010621)105:24<5663:TBBIDA>2.0.ZU;2-P
Fonte:
ISI
Lingua:
ENG
Soggetto:
GLASS-TRANSITION RELAXATION; MOLECULAR MOTIONS; MALTITOL; FRAGILITY; MANNITOL; FORMERS; DSC;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
26
Recensione:
Indirizzi per estratti:
Indirizzo: Ramos, JJM IST, Ctr Quim Fis Mol, Complexo 1,Avenida Rovisco Pais, P-1049001 Lisbon, Portugal IST Complexo 1,Avenida Rovisco Pais Lisbon Portugal P-1049001
Citazione:
N.T. Correia et al., "The beta-alpha branching in D-sorbitol as studied by thermally stimulated depolarization currents (TSDC)", J PHYS CH B, 105(24), 2001, pp. 5663-5669

Abstract

The molecular motions in D-sorbitol (D-glucitol) have been studied by thermally stimulated depolarization currents (TSDC) in the temperature region between -160 and 10 degreesC. The beta relaxation appears as a broad global peak between -160 and -50 degreesC and its features were compared with those of the beta relaxation of maltitol (a D-glucitol derivative). A study of the alpha relaxation of sorbitol, which shows a maximum intensity at approximately -1 degreesC, is also presented, and from the obtained data, the fragility index of this glass former is calculated. The alpha and beta relaxations are observed to merge in the frequency window of the TSDC technique, and it is underlined that this merging is a consequence of the overlap of the tails of these distributions in this frequency window. In this context, the merging observed by TSDC images the branching of the most probable timesof the two distributions predicted by dielectric relaxation spectroscopy at the branching temperature T alpha beta.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 23/09/20 alle ore 13:01:21