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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|
|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:||Click here to retrieve PDF version of paper (984KB)|