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Titolo:
Dispersion and flocculation behavior of metal oxide powders in organic solvent
Autore:
Shibata, J; Fujii, K; Horai, K; Yamamoto, H;
Indirizzi:
Kansai Univ, Dept Chem Engn, Suita, Osaka 5648680, Japan Kansai Univ Suita Osaka Japan 5648680 m Engn, Suita, Osaka 5648680, Japan
Titolo Testata:
KAGAKU KOGAKU RONBUNSHU
fascicolo: 4, volume: 27, anno: 2001,
pagine: 497 - 501
SICI:
0386-216X(200107)27:4<497:DAFBOM>2.0.ZU;2-6
Fonte:
ISI
Lingua:
JPN
Keywords:
metal oxide; flocculation; dispersion; organic solvent; solubility parameter; dielectric constant;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
6
Recensione:
Indirizzi per estratti:
Indirizzo: Shibata, J Kansai Univ, Dept Chem Engn, Suita, Osaka 5648680, Japan KansaiUniv Suita Osaka Japan 5648680 ta, Osaka 5648680, Japan
Citazione:
J. Shibata et al., "Dispersion and flocculation behavior of metal oxide powders in organic solvent", KAG KOG RON, 27(4), 2001, pp. 497-501

Abstract

The relation between the flocculation and dispersion of metaloxide powdersand the properties of solvents, such as dielectric constant and solubilityparameter was investigated for TiO2, Al2O3 and Fe-2 O-3. The median diameter of these metal oxides was measured in many organic solvents, from which the effect of the solvents on the flocculation and dispersion of metal oxide powders was considered. The metal oxide powders of Al2O3, TiO2 and Fe2O3 tend to disperse in a solvent of higher polarity, whereas they are apt to flocculate in a solvent oflow dielectric constant, because the Hamaker constant between the particles becomes larger in such a solvent. There are, however, some solvents that do not show these tendencies. It is possible to evaluate the flocculation and dispersion of these metal oxide powders in many solvents by using Hansen's three-dimensional solubility parameters (f(p), f(d) and f(h)). For each metal oxide powder there exists a solvent producing optimal dispersion, andthe optimal dispersion point of f(p), f(d) and f(h) is determined by the combination of metal oxide powder and the solvent.

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Documento generato il 29/09/20 alle ore 10:19:03