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Applied Physics Letters / Volume 87 / Issue 15 / STRUCTURAL, MECHANICAL, THERMODYNAMIC, AND OPTICAL PROPERTIES OF CONDENSED MATTER

Appl. Phys. Lett. 87, 151912 (2005); http://dx.doi.org/10.1063/1.2093918 (3 pages)

Spatially resolved in situ measurements of the transport of organic molecules in a polycrystalline nanoporous membrane

Weontae Oh and Sankar Nair

School of Chemical & Biomolecular Engineering, Georgia Institute of Technology, 311 Ferst Drive NW, Atlanta, Georgia 30332-0100

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(Received 25 April 2005; accepted 18 August 2005; published online 7 October 2005)

We report spatially resolved, quantitative, in situ, nondestructive measurements of the transport of organic molecules through a polycrystalline, anisotropic, nanoporous molecular sieve membrane, with micron-scale resolution. A method based on photoacoustic spectroscopy experiments during permeation through a nanoporous membrane, combined with a physical model of photoacoustic signal generation from a heterogeneous membrane, allows extraction of concentration profiles in situ. In particular, we demonstrate the steady-state concentration profiling of the organic molecules p-xylene and n-hexane during their transport through a nanoporous zeolite silicalite membrane. The implications for elucidating structure-property relationships in membrane materials for separations, catalytic, or nanotechnology applications are discussed.

© 2005 American Institute of Physics

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KEYWORDS and PACS

Keywords

organic compounds, zeolites, nanoporous materials, membranes, photoacoustic spectra, permeability, chemical analysis, nanotechnology, transport processes

PACS

  • 82.75.Jn

    Measurements and modeling of molecule migration in zeolites

  • 82.75.Mj

    Measurements and simulation of properties (optical, structural) of molecules in zeolites

  • 43.35.Ud

  • 62.65.+k

    Acoustical properties of solids

  • 82.80.Kq

    Energy-conversion spectro-analytical methods (e.g., photoacoustic, photothermal, and optogalvanic spectroscopic methods)

  • 61.43.Gt

    Powders, porous materials

  • 61.46.-w

    Structure of nanoscale materials

ARTICLE DATA

Digital Object Identifier
http://dx.doi.org/10.1063/1.2093918

PUBLICATION DATA

ISSN

0003-6951 (print)  
1077-3118 (online)

Publisher

$abstract.society.value is a Member of CrossRef American Institute of Physics

For access to fully linked references, you need to log in.
    A. Rosencwaig and A. Gersho, J. Appl. Phys. 47, 64 (1976)JAPIAU000047000001000064000001.


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