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Abstract:

We explored the catalytic effect of 15 nm diameter gold nanoparticles (AuNPs) upon the thermal Z-E isomerization reaction of azobenzene and nine 4 and 4-4′ substituted azobenzenes (ABs). The kinetics follows a first order rate in ranges of [ABs] = 5 to 50 μM and [AuNPs] = 50 pM to 1 nM. A kinetic analysis of this compartmentalized system renders the thermal Z-E isomerization rate constant associated with each AuNP. Enhancements of 10- to 106-fold were measured for this rate constant in comparison to the same free ABs in solution. Experiments with selective Au facet coverage, as well as the kinetics studied in gold-silica core-shell nanoparticles (AuNP@SiO2) of different thicknesses, demonstrate the surface nature of the catalysis and allow one to evaluate the diffusion coefficient of azobenzene in the silica layer. This journal is © The Royal Society of Chemistry 2015.

Registro:

Documento: Artículo
Título:Mechanistic insight into the Z-E isomerization catalysis of azobenzenes mediated by bare and core-shell gold nanoparticles
Autor:Simoncelli, S.; Aramendía, P.F.
Filiación:Centro de Investigaciones en Bionanociencias Elizabeth Jares-Erijman (CIBION-CONICET), Godoy Cruz 2390, Buenos Aires, 1425, Argentina
Departamento de Química Inorgánica, Analítica y Química Física, Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Pabellón 2, Ciudad Universitaria, Buenos Aires, 1428, Argentina
Instituto de Química Física de Materiales, Ambiente y Energía, Pabellón 2, Ciudad Universitaria, Buenos Aires, 1428, Argentina
Palabras clave:Catalysis; Diffusion; Fiber optic sensors; Gold; Isomerization; Isomers; Kinetics; Metal nanoparticles; Nanoparticles; Rate constants; Silica; Catalytic effects; Compartmentalized systems; Core-shell gold nanoparticles; First-order rates; Gold nanoparticle; Isomerization reaction; Kinetic analysis; Silica core-shell nanoparticles; Azobenzene
Año:2015
Volumen:5
Número:4
Página de inicio:2110
Página de fin:2116
DOI: http://dx.doi.org/10.1039/c4cy01442a
Título revista:Catalysis Science and Technology
Título revista abreviado:Catal. Sci. Technolog.
ISSN:20444753
CODEN:CSTAG
Registro:https://bibliotecadigital.exactas.uba.ar/collection/paper/document/paper_20444753_v5_n4_p2110_Simoncelli

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Citas:

---------- APA ----------
Simoncelli, S. & Aramendía, P.F. (2015) . Mechanistic insight into the Z-E isomerization catalysis of azobenzenes mediated by bare and core-shell gold nanoparticles. Catalysis Science and Technology, 5(4), 2110-2116.
http://dx.doi.org/10.1039/c4cy01442a
---------- CHICAGO ----------
Simoncelli, S., Aramendía, P.F. "Mechanistic insight into the Z-E isomerization catalysis of azobenzenes mediated by bare and core-shell gold nanoparticles" . Catalysis Science and Technology 5, no. 4 (2015) : 2110-2116.
http://dx.doi.org/10.1039/c4cy01442a
---------- MLA ----------
Simoncelli, S., Aramendía, P.F. "Mechanistic insight into the Z-E isomerization catalysis of azobenzenes mediated by bare and core-shell gold nanoparticles" . Catalysis Science and Technology, vol. 5, no. 4, 2015, pp. 2110-2116.
http://dx.doi.org/10.1039/c4cy01442a
---------- VANCOUVER ----------
Simoncelli, S., Aramendía, P.F. Mechanistic insight into the Z-E isomerization catalysis of azobenzenes mediated by bare and core-shell gold nanoparticles. Catal. Sci. Technolog. 2015;5(4):2110-2116.
http://dx.doi.org/10.1039/c4cy01442a