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Quantitative 3D evolution of colloidal nanoparticle oxidation in solution

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Science  21 Apr 2017:
Vol. 356, Issue 6335, pp. 303-307
DOI: 10.1126/science.aaf6792

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Watching nanomaterials transform in time

Real-time analysis of chemical transformations of nanoparticles is usually done with electron microscopy of a few particles. One limitation is interference by the electron beam. Sun et al. monitored the oxidation of iron nanoparticles in solution by using small- and wide-angle x-ray scattering and molecular dynamics simulations (see the Perspective by Cadavid and Cabot). These methods revealed the formation of voids within the nanoparticles, diffusion of material into and out of the nanoparticles, and ultimately the coalescence of the voids.

Science, this issue p. 303; see also p. 245