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Updated: Aug 25, 2026
Determining Surface Areas and Pore Volumes of Metal-Organic Frameworks
Published on: March 8, 2024
Characterization of porous structure through the dynamical properties of ions confined in sulfonated polyimide
A-L Rollet1, J-F Blachot, A Delville
1Centre de Recherche sur les Matériaux à Hautes Températures, CNRS UPR4212, 1D avenue de la Recherche Scientifique, 45071 Orléans Cedex 2, France. rollet@cnrs-orleans.fr
Abstract:
The structure of sulfonated PolyImide (sPI) ionomer membrane has been investigated via the transport properties of ions confined inside. Transport coefficients of N(CH(3))(4)(+) and Na(+) ions have been determined by several techniques in order to get a range of time/space scale as wide as possible: a method using radiotracers, conductivity, pulsed field gradient NMR and NMR quadrupolar relaxation rates determination. For N(CH(3))(4)(+), the self-diffusion has been measured in the direction of membrane plan (parallel) and in the perpendicular direction (transverse), whereas for Na(+) only transverse self-diffusion has been measured. The conductivity of both ions has been measured in the transverse direction. The results show a anisotropic and multiscale structure with a separation phase between hydrophilic and hydrophobic domains that is not well-defined.
