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Titolo:
Friction of gels. 5. Negative load dependence of polysaccharide gels
Autore:
Gong, JP; Iwasaki, Y; Osada, Y;
Indirizzi:
Hokkaido Univ, Grad Sch Sci, Sapporo, Hokkaido 0600810, Japan Hokkaido Univ Sapporo Hokkaido Japan 0600810 oro, Hokkaido 0600810, Japan
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 15, volume: 104, anno: 2000,
pagine: 3423 - 3428
SICI:
1520-6106(20000420)104:15<3423:FOG5NL>2.0.ZU;2-E
Fonte:
ISI
Lingua:
ENG
Soggetto:
GELATION; GELLAN; MODEL;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
18
Recensione:
Indirizzi per estratti:
Indirizzo: Osada, Y Hokkaido Univ, Grad Sch Sci, Sapporo, Hokkaido 0600810, Japan Hokkaido Univ Sapporo Hokkaido Japan 0600810 aido 0600810, Japan
Citazione:
J.P. Gong et al., "Friction of gels. 5. Negative load dependence of polysaccharide gels", J PHYS CH B, 104(15), 2000, pp. 3423-3428

Abstract

The sliding friction of three kinds of polysaccharide gels, agarose, gellan, and kappa-carrageenan, against a glass plate has been investigated underaerobic and water condition. The frictional force of these gels slightly increases with the increase in the load applied in air, while it strongly increases with the load in water. However, when the load exceeding a criticalvalue is applied, the frictional force of gellan gel and kappa-carrageenangel showed a pronounced negative load dependence. The observed specific phenomenon seems to be originated from the instability of the network of the polysaccharide gel. High loading leads to the loosing and/or dissolution inpart of the cross-linkage and brings about an increased hydrodynamic waterlayer that serves as a good lubricator under the high load. The mechanism of friction was discussed in terms of the repulsion-adsorption model of friction proposed by the authors.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/04/20 alle ore 23:19:37