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Molecular and Colloidal Transport in Bacterial Cellulose Hydrogels.

Firoozeh Babayekhorasani1, Maryam Hosseini1, Patrick T Spicer1

  • 1School of Chemical Engineering, University of New South Wales, Sydney, NSW 2052, Australia.

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Bacterial cellulose biofilms feature layered structures that control transport. Understanding these nanofiber networks and their pore sizes is key to optimizing applications from implants to textiles.

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Area of Science:

  • Biomaterials Science
  • Nanotechnology
  • Microbiology

Background:

  • Bacterial cellulose (BC) forms complex nanofiber networks essential for bacterial protection and transport control.
  • Understanding BC microstructure is crucial for accurate transport simulations and diverse applications.
  • Diffusion through BC films depends on microstructural length scales, influencing permeability.

Purpose of the Study:

  • To characterize the pore structure and quantify tracer particle and macromolecule mobility within bacterial cellulose biofilms.
  • To investigate the relationship between BC microstructure and diffusion dynamics.
  • To explore how fermentation conditions affect BC structure and transport properties.

Main Methods:

  • Microscopy techniques were employed to analyze the pore structure of bacterial cellulose films.
  • Tracer particles and macromolecules of various sizes were used to quantify mobility dynamics.
  • Fermentation conditions were manipulated to tune the spacing of the periodic nanofiber mesh structure.

Main Results:

  • BC biofilms exhibit a naturally periodic structure with alternating dense and porous nanofiber layers.
  • Micron-sized particles could permeate porous layers but not dense layers.
  • Tracer mobility within porous layers was isotropic, suggesting a random pore structure, while molecular diffusion was minimally impacted by tortuosity.

Conclusions:

  • The layered structure of bacterial cellulose biofilms significantly influences transport properties.
  • Controlling the spacing of dense and porous layers via fermentation can tune permeability.
  • This knowledge can guide the design of symbiotic cultures and enhance BC applications in medicine, textiles, and sensors.