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Membrane characterization by microscopic and scattering methods: multiscale structure.

Rahma Tamime1, Yvan Wyart2, Laure Siozade3

  • 1Laboratoire de Mécanique, Modélisation et Procédés Propres (M2P2-CNRS UMR 6181), Université Paul Cézanne Aix Marseille, Europôle de l'Arbois, 13545 Aix en Provence Cedex 04, France. rahma.tamime@etu.univ-cezanne.fr.

Membranes
|June 25, 2014
PubMed
Summary
This summary is machine-generated.

This study characterizes polyethersulfone (PES) membranes using microscopy and scattering techniques. Membrane roughness and pore size were analyzed across various scales, revealing bulk scattering origins.

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Area of Science:

  • Materials Science
  • Surface Science
  • Polymer Science

Background:

  • Polyethersulfone (PES) membranes are crucial in various separation processes.
  • Understanding membrane surface and bulk properties is essential for optimizing performance.
  • Characterizing membrane morphology across different scales informs material design.

Purpose of the Study:

  • To comprehensively characterize the surface and bulk properties of novel polyethersulfone (PES) membranes.
  • To investigate the relationship between observation scale and membrane roughness.
  • To identify the origin of scattering phenomena in the membranes.

Main Methods:

  • Scanning Electron Microscopy (SEM) for atomic-scale pore size analysis.
  • White Light Interferometry (WLI) and Atomic Force Microscopy (AFM) for surface roughness assessment across multiple scales.
  • High angular resolution ellipsometry to determine membrane cut-off signatures and scattering origins.

Main Results:

  • SEM revealed atomic-scale pore sizes of membrane skin layers.
  • Membrane roughness significantly increased with observation scale, showing continuity across different scan sizes for RMS roughness determination.
  • Ellipsometric measurements provided distinct signatures for each membrane cut-off, identifying the bulk as the source of scattering.

Conclusions:

  • The study successfully characterized PES membranes using a multi-scale approach.
  • Membrane roughness is scale-dependent, with a consistent trend observed across different magnifications.
  • Scattering originates from the bulk of the membrane, providing insights into internal structure.