Small-Angle Neutron Scattering for In Situ Probing of Ion Adsorption Inside Micropores

Authors

  • S. Boukhalfa,

    1. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA (USA)
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  • L. He,

    1. Neutron Sciences Directorate, Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN (USA)
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  • Y. B. Melnichenko,

    1. Neutron Sciences Directorate, Biology and Soft Matter Division, Oak Ridge National Laboratory, Oak Ridge, TN (USA)
    2. Department of Physics and Astronomy, University of Tennessee, Knoxville, TN 37966 (USA)
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  • Prof. Gleb Yushin

    Corresponding author
    1. School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA (USA)
    • School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, GA (USA)

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  • This work was partially supported by the Georgia Institute of Technology and the US Army Research Office (contract number W911NF-12-1-0259). The research at ORNL’s High Flux Isotope Reactor was sponsored by the Laboratory Directed Research and Development Program and the Scientific User Facilities Division, Office of Basic Energy Sciences, U.S. Department of Energy. This research was also supported in part by the ORNL Postdoctoral Research Associates Program, administered jointly by the ORNL and the Oak Ridge Institute for Science and Education. We thank Micromeritics Inc. (US) and J. Jagiello for assistance with gas and vapor sorption analyses.

Abstract

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Confined ions: The high penetrating power and sensitivity of neutron scattering to isotope substitution are harnessed to observe changes in the ion concentration in a porous carbon material as a function of the applied potential and the pore size. Depending on the solvent properties and the solvent–pore-wall interactions, either enhanced or reduced ion electroadsorption may take place.

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