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Titolo:
Stable silver clusters and nanoparticles prepared in polyacrylate and inverse micellar solutions
Autore:
Zhang, ZQ; Patel, RC; Kothari, R; Johnson, CP; Friberg, SE; Aikens, PA;
Indirizzi:
Clarkson Univ, Dept Chem, Potsdam, NY 13699 USA Clarkson Univ Potsdam NY USA 13699 Univ, Dept Chem, Potsdam, NY 13699 USA Uniqema, Wilmington, DE 19850 USA Uniqema Wilmington DE USA 19850Uniqema, Wilmington, DE 19850 USA
Titolo Testata:
JOURNAL OF PHYSICAL CHEMISTRY B
fascicolo: 6, volume: 104, anno: 2000,
pagine: 1176 - 1182
SICI:
1520-6106(20000217)104:6<1176:SSCANP>2.0.ZU;2-9
Fonte:
ISI
Lingua:
ENG
Soggetto:
ENHANCED RAMAN-SCATTERING; AQUEOUS-SOLUTION; COLLOIDAL SILVER; PULSE-RADIOLYSIS; NANOSTRUCTURED MATERIALS; NANOSIZED PARTICLES; OPTICAL-ABSORPTION; REVERSE MICELLES; FINE PARTICLES; SIZE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Physical, Chemical & Earth Sciences
Citazioni:
61
Recensione:
Indirizzi per estratti:
Indirizzo: Patel, RC Clarkson Univ, Dept Chem, Potsdam, NY 13699 USA Clarkson Univ Potsdam NY USA 13699 Chem, Potsdam, NY 13699 USA
Citazione:
Z.Q. Zhang et al., "Stable silver clusters and nanoparticles prepared in polyacrylate and inverse micellar solutions", J PHYS CH B, 104(6), 2000, pp. 1176-1182

Abstract

Silver clusters and nanoparticles were prepared by reduction of silver nitrate by sodium borohydride in water, in the presence of polyacrylate ions, and in inverse micellar solutions consisting of Laureth 4 and water. Thr: kinetics of formation of Ag-4(2+) aggregates and Ag-9(+) in the presence of polyacrylate ions could be observed by the stopped-flow technique, and die characteristic UV absorption spectra of the respective stable clusters wererecorded, The formation of these species was critically dependent on the manner in which reactants were combined. The silver nanoparticles prepared in the inverse micellar solutions using different mixing procedures were characterized via UV-vis spectra, dynamic light scattering, and transmission electron microscopy. The results showed that the procedure of adding aqueoussodium borohydride solution into the inverse micellar solution containing silver nitrate gave the most uniform spherical silver nanoparticles. The reaction kinetics of this procedure was investigated through UV-vis spectra, which indicated that the generation of silver nanoparticles occurred in parallel with the disappearance of smaller clusters, and was characterized by a single exponential with a time constant of about 18 s, followed by aggregation into much larger particles.

ASDD Area Sistemi Dipartimentali e Documentali, Università di Bologna, Catalogo delle riviste ed altri periodici
Documento generato il 27/09/20 alle ore 13:00:39