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Titolo:
Structure of cationic starch (CS)/anionic surfactant complexes studied by small-angle X-ray scattering (SAXS)
Autore:
Merta, J; Torkkeli, M; Ikonen, T; Serimaa, R; Stenius, P;
Indirizzi:
Helsinki Univ Technol, Dept Forest Prod Technol, Lab Forest Prod Chem, FIN-02015 Espoo, Finland Helsinki Univ Technol Espoo Finland FIN-02015 , FIN-02015 Espoo, Finland Univ Helsinki, Dept Phys, Lab Xray Phys, FIN-00170 Helsinki, Finland Univ Helsinki Helsinki Finland FIN-00170 ys, FIN-00170 Helsinki, Finland
Titolo Testata:
MACROMOLECULES
fascicolo: 9, volume: 34, anno: 2001,
pagine: 2937 - 2946
SICI:
0024-9297(20010424)34:9<2937:SOCS(S>2.0.ZU;2-5
Fonte:
ISI
Lingua:
ENG
Soggetto:
ANIONIC SURFACTANTS; ORDERED STRUCTURES; PHASE-EQUILIBRIA; LAMELLAR PHASES; CHARGE-DENSITY; SYSTEMS; WATER; POLYELECTROLYTES; DIAGRAMS; POLYMER;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
44
Recensione:
Indirizzi per estratti:
Indirizzo: Merta, J Helsinki Univ Technol, Dept Forest Prod Technol, Lab Forest Prod Chem, POB6300, FIN-02015 Espoo, Finland Helsinki Univ Technol POB 6300 Espoo Finland FIN-02015 , Finland
Citazione:
J. Merta et al., "Structure of cationic starch (CS)/anionic surfactant complexes studied by small-angle X-ray scattering (SAXS)", MACROMOLEC, 34(9), 2001, pp. 2937-2946

Abstract

The structure of lyotropic liquid crystalline or gellike phases formed in cationic starch (CS)/anionic surfactant/water systems in the temperature range 25-80 degreesC has been investigated by small-angle X-ray scattering. The surfactants were sodium dodecyl sulfate (SDS), sodium decanoate (NaDe), sodium dodecanoate (NaDod), sodium palmitate (NaPal), sodium oleate (NaOl),and sodium erucate (NaEr). The phases were in equilibrium with aqueous solutions at 60 degreesC and contained 15-25 wt % of CS, and 10-30 wt % of surfactant, depending on the charge density of the CS and the chain length of the surfactant. The phases consist of CS/surfactant aggregates arranged in long-range structures similar to lyotropic mesophases formed by the pure surfactants alone, but they separate from aqueous solutions at much lower surfactant concentrations. When the charge density of the CS is low or the surfactant hydrocarbon chain is short, cubic or hexagonal phases are formed. As expected, the formation of lamellar phase is promoted by increasing theseparameters. Temperature affects the stability of the phases and their structure. At high temperatures the long-range order breaks down, and the phases are akin to concentrated micellar CS/surfactant solutions.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 02/12/20 alle ore 15:23:22