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Title: New method to evaluate optical properties of core-shell nanostructures
Author: Celis Orozco, A.
Casillas, N.
Ramirez Meda, W.
Guitron-Robles, O.
Barcena-Soto, M.
Issue Date: 2010
Abstract: We present an exploratory study that seeks to identify new routes for the treatment of transformer dielectric oils contaminated with polychlorinated biphenyls (PCBs), through the usage of direct reduction electrochemical methods, employing Pb/PbO2 electrodes. It is possible to prepare a PCB emulsion using tensoactive agents in order to perform a direct PCB reduction effectively. Nevertheless, this procedure has drawbacks. We are focusing this study towards identifying a media capable of dissolving the contaminated oil and conferring it enough conductivity to make the direct reduction of the PCBs possible or to carry out an extraction of the PCBs from the contaminated oil before the electrolysis. To reach this goal, n-butanol as a solubilization agent and n-propanol as an extraction agent added with HCl were selected. The high electrical resistance of the media does not allow a direct reduction of the PCBs. Instead, a selective electrolysis of the PCBs, once extracted from the contaminated oil at Pb/PbO2 electrodes can take place. "The Electrochemical Society.",,,,,,"10.1149/1.3532321",,,"","",,,,,,"1",,"ECS Transactions",,"241
250",,"29",,"Scopus",,,,,,,,,,,,"Electrochemical removal of chloride from polychlorinated biphenyls in an oil/n-butanol/HCl and an n-propanol/HCl system",,"Conference Paper" "44900","123456789/35008",,"Rentería-Tapia, V., Departamento de Ciencias Naturales y Exactas, Centro Universitario de Los Valles, Universidad de Guadalajara, Ameca, Jalisco C.P. 46600, Mexico; Franco, A., Departamento de Estado Sólido, Instituto de Física, Universidad Nacional Autónoma de México, México, DF 04510, Mexico; García-Macedo, J., Departamento de Estado Sólido, Instituto de Física, Universidad Nacional Autónoma de México, México, DF 04510, Mexico",,"Renteria-Tapia, V.
Franco, A.
García-Macedo, J.",,"2012",,"A new method is presented to calculate, for metallic core-dielectric shell nanostructures, the local refractive index, resonance condition, maximum spectral shift, plasma wavelength, and the sensitivity of the wavelength maximum to variations in the refractive index of the environment. The equations that describe these properties are directly related to the surface plasmon peak position, refractive index of the shell, and to the surrounding medium. The method is based on the approach that a layered core dispersed in a dielectric environment (core-shell model) can be figured out as an uncoated sphere dispersed in a medium with a local refractive index (local refractive index model). Thus, in the Mie theory, the same spectral position of the surface plasmon resonance peak can be obtained by varying the volume fraction of the shell or by varying the local refractive index. The assumed equivalence between plasmon resonance wavelengths enable us to show that the local refractive index depends geometrically on the shell volume fraction. Hence, simple relationships between optical and geometrical properties of these core-shell nanostructures are obtained. Furthermore, good agreement is observed between the new relationships and experimental data corresponding to gold nanoparticles (radius = 7.5 nm) covered with silica shells (with thicknesses up to 29.19 nm), which insured that the equivalence hypothesis is correct. " 2012 Springer Science+Business Media B.V.
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