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Titolo:
Effects of adsorbed polyaniline on redox processes on As2O3 surfaces
Autore:
de Farias, RF; de Souza, JM; de Melo, JV; Airoldi, C;
Indirizzi:
Univ Estadual Campinas, Inst Quim, BR-13083970 Campinas, SP, Brazil Univ Estadual Campinas Campinas SP Brazil BR-13083970 BCpinas, SP, Brazil Univ Fed Roraima, Dept Quim, BR-69310270 Boa Vista, Roraima, Brazil Univ Fed Roraima Boa Vista Roraima Brazil BR-69310270 BC, Roraima, Brazil Univ Fed Pernambuco, Dept Quim Fundamental, BR-50670901 Recife, PE, BrazilUniv Fed Pernambuco Recife PE Brazil BR-50670901 BC901 Recife, PE, Brazil
Titolo Testata:
JOURNAL OF COLLOID AND INTERFACE SCIENCE
fascicolo: 1, volume: 227, anno: 2000,
pagine: 147 - 151
SICI:
0021-9797(20000701)227:1<147:EOAPOR>2.0.ZU;2-7
Fonte:
ISI
Lingua:
ENG
Soggetto:
CONDUCTING POLYMERS; THERMAL-DEGRADATION; EMERALDINE BASE; POLYMERIZATION; INTERCALATION; SOLIDS; KRAFT; THERMOGRAVIMETRY; PHOSPHONATE; CATALYSTS;
Keywords:
polyaniline; arsenic oxide; surface; cyclic voltametry;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
37
Recensione:
Indirizzi per estratti:
Indirizzo: Airoldi, C Univ Estadual Campinas, Inst Quim, Caixa Postal 6154, BR-13083970 Campinas, SP, Brazil Univ Estadual Campinas Caixa Postal 6154 Campinas SP Brazil BR-13083970 BC
Citazione:
R.F. de Farias et al., "Effects of adsorbed polyaniline on redox processes on As2O3 surfaces", J COLL I SC, 227(1), 2000, pp. 147-151

Abstract

Polyaniline deposited on As2O3 surface resulted in a new material, which was characterized by infrared spectoscopy, thermogravimetry, differential scanning calorimetry, scanning electron microscopy, X-ray diffraction, and cyclic voltammetry, The mass percentage of polymer deposited on oxide surfaceis approximately 13%, The scanning electron microscopy images as well as the X-ray diffraction patterns provided conclusive evidence that the oxide surface is coated by the polymer. The cyclic voltammograms of the polyaniline adsorbed on As2O3 surface showed that the adsorbate exerts remarkable effects on redox processes on this oxide. The pure oxide exhibited two oxidation/rcduction peaks at 0.25/-0.06 and 0.47/-0.25 V attributed tentatively tothe processes As2O3(s) + 6H(+) + 6e(-) = 2As(s) + 3H(2)O and As(s) + 3H(+)+ 3e(-) = AsH3(g), respectively. The polyaniline-coated sample exhibited abetter-defined voltammogram in which the first oxidation peak of the oxidehad its intensity increased about four times. (C) 2000 Academic Press.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 20/09/20 alle ore 19:52:28