Solvent diffusivity and viscosity in graphene oxide membrane for water-ethanol separation.

ORAL

Abstract

Graphene oxide (GO) membranes were recently suggested for applications in separation of ethanol from water using a vapor permeation method. Understanding microscopic diffusivity of water and ethanol in graphene oxide membranes is important for separations applications. It is also important to study the anisotropy of water and ethanol diffusivity between the direction perpendicular to the plane and in-plane direction. We used quasielastic neutron scattering(QENS) to measure the temperature dependence of the diffusivity of water and ethanol, and its anisotropy by the utilization of Q-dependence of QENS signals obtained from BASIS at Oak Ridge National Lab. We will also discuss how dynamic measurements from QENS can be correlated with atomic force microscopy measurements of the temperature dependence of viscosity in water/ethanol confined in GO.

*We thank Wayne State University for funding and ORNL for providing access to BASIS through a user proposal.

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Presenters

  • Gobin Acharya

    • Wayne State University

Authors

  • Gobin Acharya

    • Wayne State University

  • Peter Hoffmann

    • Wayne State University

  • Eugene Mamontov

    • Oak Ridge National Lab
    • Neutron Scattering Division, Neutron Sciences Directorate, Oak Ridge National Laboratory, Oak Ridge, Tennessee 37831, USA
    • Oak Ridge National Laboratory
    • Neutron Scattering Division, Oak Ridge National Laboratory, Oak Ridge, TN, USA

  • Madhusudan Tyagi

    • National Institute of Standards and Technology
    • NIST Center for Neutron Research, 444 National Institute of Standards and Technology, Gaithersburg, 445 Maryland 20899, United States
    • National Institute of Science and Technology
    • NIST Center for Neutron Research | NIST
    • NIST