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Titolo:
ADSORPTION OF QUATERNARY AMMONIUM-COMPOUNDS ON THE SURFACE OF SODIUM OXALATE - FTIR ATR INVESTIGATION UNDER HIGH-IONIC-STRENGTH, HIGHLY ALKALINE CONDITIONS/
Autore:
HIND AR; BHARGAVA SK; GROCOTT SC;
Indirizzi:
ROYAL MELBOURNE INST TECHNOL,DEPT APPL CHEM,GPO BOX 2476V MELBOURNE VIC 3001 AUSTRALIA ROYAL MELBOURNE INST TECHNOL,DEPT APPL CHEM MELBOURNE VIC 3001 AUSTRALIA ALCOA AUSTRALIA PROPRIETARY LTD,DEPT RES & DEV KWINANA WA 6167 AUSTRALIA
Titolo Testata:
Langmuir
fascicolo: 23, volume: 13, anno: 1997,
pagine: 6255 - 6259
SICI:
0743-7463(1997)13:23<6255:AOQAOT>2.0.ZU;2-Q
Fonte:
ISI
Lingua:
ENG
Soggetto:
TRANSFORM INFRARED-SPECTROSCOPY; METAL-OXIDE SURFACES; CATIONIC SURFACTANTS; SOLID/LIQUID INTERFACE; ANIONIC SURFACTANTS; SILICA; PHASE; CHEMISTRY; POLYMERS; CHLORIDE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Science Citation Index Expanded
Citazioni:
39
Recensione:
Indirizzi per estratti:
Citazione:
A.R. Hind et al., "ADSORPTION OF QUATERNARY AMMONIUM-COMPOUNDS ON THE SURFACE OF SODIUM OXALATE - FTIR ATR INVESTIGATION UNDER HIGH-IONIC-STRENGTH, HIGHLY ALKALINE CONDITIONS/", Langmuir, 13(23), 1997, pp. 6255-6259

Abstract

Using a recently developed method for the in situ investigation of the surface of sodium oxalate-a Bayer process solid-in highly alkaline, high-ionic-strength, aqueous media, ''dose-response'' curves for a series of alkyltrimethylammonium bromides on the surface of sodium oxalate have been obtained. These curves show the extent of adsorption increasing with alkyl chain length until the point is reached where the alkyl chain of the adsorbed compound adopts a coil-like orientation at the oxalate surface, thereby reducing the amount adsorbed compared with those for the shorter chain homologues. These shorter chain compounds are adsorbed to the oxalate surface in a predominantly perpendicular manner, while the longer chain compound may adopt a more tilted surfaceorientation. Results obtained for a synthetic oxalate stabilizer formulation suggest that the compound is adsorbed in a manner analogous tothat of the shorter chain compounds. Decreased adsorption observed athigher initial concentrations is due to the formation of large cylindrical or lamellar micelles, which exhibit increased stability relativeto that of the adsorbed form. The formation of these large micellar aggregates is a result of the high ionic strength of the adsorption matrix. We believe this to be the first instance in which FTIR/ATR has been used to obtain both qualitative and quantitative information as to the nature of the interfacial layer of dispersed particulate matter.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 07/07/20 alle ore 18:49:31