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Publication Citation: In situ electrochemical small-angle neutron scattering (eSANS) for quantitative structure and redox properties of nanoparticles

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Author(s): Vivek M. Prabhu; Vytautas Reipa;
Title: In situ electrochemical small-angle neutron scattering (eSANS) for quantitative structure and redox properties of nanoparticles
Published: February 16, 2012
Abstract: Rapid growth in nanomaterial applications highlight limitations of available physicochemical characterization methods. An in situ electrochemical small-angle neutron scattering (eSANS) meth-odology was devised that enables direct measurements of nano-material dispersion structure while undergoing reduction-oxidation (redox) reactions at the vitreous carbon electrode. Further, these porous electrodes are amenable to contrast-variant neutron scattering strategies to measure nanoparticle structure and polymer conformation in multi-component systems. The eSANS method was tested for feasibility by characterizing ZnO nanoparticles in 50 mmol/L NaCl deuterium oxide solution un-dergoing bulk electrolysis at negative potentials. Irreversible nanoparticle structural changes are observed during the potential cycle. The complete reduction of Zn2+ to Zn0 nanoparticles is unlikely, but an increase in the correlation length occurs as a pre-cursor to substantial redox bias and reduced correlation length.
Citation: Journal of the American Chemical Society
Volume: 3
Pages: pp. 646 - 650
Keywords: nanoparticle; electrochemical; neutron scattering; toxicity; redox
Research Areas: Soft Condensed Matter, Semiconductor Materials, Cosmetics
DOI: http://dx.doi.org/10.1021/jz300124t  (Note: May link to a non-U.S. Government webpage)
PDF version: PDF Document Click here to retrieve PDF version of paper (984KB)