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Titolo:
Liquid crystals in aqueous solutions of sodium naphthenates
Autore:
Horvath-Szabo, G; Czarnecki, J; Masliyah, J;
Indirizzi:
Lorand Eotvos Univ, Dept Colloid Chem, H-1518 Budapest 112, Hungary LorandEotvos Univ Budapest Hungary 112 em, H-1518 Budapest 112, Hungary Syncrude Canada Ltd, Edmonton Res Ctr, Edmonton, AB T6N 1H4, Canada Syncrude Canada Ltd Edmonton AB Canada T6N 1H4 monton, AB T6N 1H4, Canada Univ Alberta, Dept Chem & Mat Engn, Edmonton, AB T6G 2G6, Canada Univ Alberta Edmonton AB Canada T6G 2G6 ngn, Edmonton, AB T6G 2G6, Canada
Titolo Testata:
JOURNAL OF COLLOID AND INTERFACE SCIENCE
fascicolo: 2, volume: 236, anno: 2001,
pagine: 233 - 241
SICI:
0021-9797(20010415)236:2<233:LCIASO>2.0.ZU;2-2
Fonte:
ISI
Lingua:
ENG
Soggetto:
BEHAVIOR;
Keywords:
naphthenic acids; naphthenates; lamellar liquid crystal; screw dislocation; gel; partition coefficient; vesicle, hydrotrope; surface relieve; surface roughness;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
24
Recensione:
Indirizzi per estratti:
Indirizzo: Horvath-Szabo, G Lorand Eotvos Univ, Dept Colloid Chem, POB 32, H-1518 Budapest 112, Hungary Lorand Eotvos Univ POB 32 Budapest Hungary 112 , Hungary
Citazione:
G. Horvath-Szabo et al., "Liquid crystals in aqueous solutions of sodium naphthenates", J COLL I SC, 236(2), 2001, pp. 233-241

Abstract

The phase diagram of the sodium naphthenates (SN)/water system was determined between -5 and 95 degreesC. Oil, isotropic water solution, and birefringent gel phases were observed. The appearance of the oil phase was caused by the hydrolysis of SN, After the system was allowed to stand for 3 weeks, a lamellar liquid crystal (LLC) phase separated from the rest of the systemat 25 degreesC. This phase was always observed together with other phases. This phase behavior is attributed to different partition coefficient values of the individual constituents of sodium naphthenates between the phases. The partition coefficient difference also caused the appearance of a clearLLC and a turbid gel phase. Under the influence of agitation, the LLC phase with isotropic water solution transformed to giant vesicles; however the equilibrium state of the LLC is of parallel stacked layer structure, Macroscopic dislocations of the liquid crystal were observed, and they were anchored to the interface of the isotropic solution and the liquid crystal phases. These dislocations are similar to screw-type dislocations. The solubilization curve of toluene by SN is analogous to that of hydrophobic materials by a hydrotrope, (C) 2001 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 25/11/20 alle ore 18:27:47