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  11. Multiscale Study Of The Chiral Self-assembly Of Cellulose Nanocrystals During The Frontal Ultrafiltration Process.
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  3. Research Domains
  5. Chemical Sciences
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  9. Nanochemistry
  11. Multiscale Study Of The Chiral Self-assembly Of Cellulose Nanocrystals During The Frontal Ultrafiltration Process.

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Samuel Mandin1, Lorenzo Metilli2, Mohamed Karrouch1

  • 1Univ. Grenoble Alpes, CNRS, Grenoble INP (Institute of Engineering Univ. Grenoble Alpes), LRP, F-38000 Grenoble, France. frederic.pignon@univ-grenoble-alpes.fr.

Nanoscale
|September 25, 2024

View abstract on PubMed

Summary
This summary is machine-generated.

Cellulose nanocrystals form ordered chiral nematic structures at membrane surfaces during ultrafiltration. This self-organization is preserved even after drying, showing potential for scalable applications.

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Area of Science:

  • Materials Science
  • Chemical Engineering
  • Biomaterials Science

Background:

  • Cellulose nanocrystals (CNCs) are advanced nanomaterials with unique properties.
  • Understanding CNC behavior during separation processes is crucial for their application.
  • Frontal ultrafiltration is a common method for separating and concentrating particles.

Purpose of the Study:

  • To characterize the nano- and microscale structural organization of CNCs at membrane surfaces during ultrafiltration.
  • To investigate the self-assembly and structural evolution of CNCs within the concentration polarization layer (CPL).
  • To assess the stability and potential for scale-up of the observed CNC structures.

Main Methods:

  • In situ small-angle X-ray scattering (SAXS) and light scattering (SALS) were employed to analyze CNC structures during filtration.
  • Scanning electron microscopy (SEM) and wide-angle X-ray diffraction (WAXD) were used for post-filtration analysis.

    • Main Results:

    • CNCs self-assembled at the membrane surface, forming a concentration polarization layer (CPL) with a chiral nematic (cholesteric) helicoidal structure.
    • The long axes of CNCs aligned parallel to the membrane, while the helical axis oriented perpendicular to it.
    • A pitch gradient was observed within the CPL, and the cholesteric structure remained stable after pressure release and even after 14 days of air-drying.

    Conclusions:

    • Ultrafiltration induces self-organization of CNCs into stable, oriented cholesteric structures.
    • The observed structural integrity suggests the feasibility of scaling up CNC processing using this method.
    • This study provides fundamental insights into the structural behavior of CNCs during membrane filtration.