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Fibrous hydrogels under biaxial confinement.

Yang Li1,2, Yunfeng Li3,4, Elisabeth Prince3,5

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Fibrous hydrogels confined in capillaries show unique elongation and densification due to filament properties. This finding impacts understanding clot lysis and developing new endovascular plugs.

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Area of Science:

  • Biomaterials Science
  • Soft Matter Physics
  • Biomedical Engineering

Background:

  • Fibrous hydrogels are crucial in biological and biomedical applications.
  • Previous studies focused on uniaxial compression and stretching, leaving biaxial confinement unexplored.
  • Understanding hydrogel behavior under confinement is vital for tissue engineering and medical devices.

Purpose of the Study:

  • To investigate the response of fibrous hydrogels to biaxial confinement in narrow capillaries.
  • To elucidate the unique mechanical behavior of fibrous hydrogels compared to flexible-strand gels under confinement.
  • To provide insights into the lysis resistance of occlusive clots and inform the design of endovascular plugs.

Main Methods:

  • Experimental investigation of fibrous hydrogel behavior in capillaries.
  • Theoretical modeling to explain the observed mechanical responses.
  • Analysis of mechanical properties including elongation and Poisson's ratio under confinement.

Main Results:

  • Fibrous hydrogels exhibit weak elongation and a decrease in biaxial Poisson's ratio to zero under strong confinement.
  • This behavior leads to significant gel densification and reduced liquid flux.
  • The response differs qualitatively from flexible-strand gels due to filament asymmetry.

Conclusions:

  • The unique mechanical response of fibrous hydrogels to biaxial confinement is driven by filament properties (soft in compression, stiff in extension).
  • Findings offer insights into the resistance of blood clots to therapeutic lysis.
  • Results support the development of fibrous hydrogel-based endovascular plugs for hemorrhage control and tumor treatment.