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Titolo:
On-line characterization of silica gels by acoustic near field
Autore:
Cros, B; Pauthe, M; Rguiti, M; Ferrandis, JY;
Indirizzi:
Univ Montpellier 2, LAIN, F-34095 Montpellier 05, France Univ Montpellier 2 Montpellier France 05 F-34095 Montpellier 05, France Univ Montpellier 2, LPMC, F-34095 Montpellier, France Univ Montpellier 2 Montpellier France F-34095 -34095 Montpellier, France
Titolo Testata:
SENSORS AND ACTUATORS B-CHEMICAL
fascicolo: 1-3, volume: 76, anno: 2001,
pagine: 115 - 123
SICI:
0925-4005(20010601)76:1-3<115:OCOSGB>2.0.ZU;2-K
Fonte:
ISI
Lingua:
ENG
Soggetto:
NEAR-FIELD; VISCOELASTIC PROPERTIES; GELATION; LIQUIDS; VISCOSITY; SENSOR;
Keywords:
sol-gel; alkoxide; acoustic near field; rheological properties; gelation; aging;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Engineering, Computing & Technology
Citazioni:
22
Recensione:
Indirizzi per estratti:
Indirizzo: Cros, B Univ Montpellier 2, LAIN, F-34095 Montpellier 05, France Univ Montpellier 2 Montpellier France 05 Montpellier 05, France
Citazione:
B. Cros et al., "On-line characterization of silica gels by acoustic near field", SENS ACTU-B, 76(1-3), 2001, pp. 115-123

Abstract

The acoustic near field technique consists in studying the features of theresonance state of an acoustic hem. The alterations of the resonance curveare investigated as a function of the evolution of the theological properties of the medium to characterize. The contact between the sample and the horn is obtained through the immersion of the terminal section, the probe, in the medium. Two resonance peaks appears, whose impedance alteration is representative of the viscosity of the medium. We used this technique to study silica gels obtained from silicon alkoxide. The higher frequency peak, very sensitive, is used to characterize the gelation step. This peak disappears during aging, characterized by the lower frequency peak. The influence of the preparation parameters of the sol (catalyst type, hydrolysis water amount, solvent amount and temperature) on gelation, aging and final theological properties was studied. (C) 2001 Elsevier Science B.V. All rights reserved.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 29/03/20 alle ore 18:13:39