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In situ transmission electron microscopic investigations of reduction-oxidation reactions during densification of nickel nanoparticles

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Abstract

The consolidation of crystalline powders to obtain dense microstructures is typically achieved through a combination of volume and grain boundary diffusion. In situ transmission electron microscopy was utilized to study neck formation between adjacent nickel particles during the early stages of sintering. It was found that the presence of carbon during consolidation of Ni lowers the reduction temperature of nickel oxides on the particle surface and therefore has the potential to accelerate consolidation. In the absence of carbon, the surface oxides remain present during the early stage of sintering and neck formation between particles is limited by self-diffusion of nickel through the oxide layer. This study provides direct experimental evidence that corroborates related earlier hypotheses of self-cleaning on the surface of the nanoparticles that precedes neck formation and growth.

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Acknowledgments

This study was partially funded through UC Davis start-up funds and a young faculty early career award by the U.S. National Science Foundation (DMR-#0955638). M.M. acknowledges financial support from the Japan Student Services Organization (JASSO. T.B.H. and A.K.M. were supported by the Office of Naval Research (Program Manager Dr. L. Kabacoff under Grant No. N00014-10-1-0632

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Authors and Affiliations

  1. Department of Chemical Engineering and Materials Science, Division of Materials Science and Engineering, University of California Davis, Davis, California, 95616, USA

    Misa Matsuno, Cecile S. Bonifacio, Jorgen F. Rufner, Andrew M. Thron, Troy B. Holland, Amiya K. Mukherjee & Klaus van Benthem

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  1. Misa Matsuno
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  2. Cecile S. Bonifacio
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  3. Jorgen F. Rufner
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Correspondence to Klaus van Benthem.

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Matsuno, M., Bonifacio, C.S., Rufner, J.F. et al. In situ transmission electron microscopic investigations of reduction-oxidation reactions during densification of nickel nanoparticles. Journal of Materials Research 27, 2431–2440 (2012). https://doi.org/10.1557/jmr.2012.256

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