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Sulfobetaine Hydrogels with a Complex Multilength-Scale Hierarchical Structure.

Ramona B J Ihlenburg1, Tobias Mai1, Andreas F Thünemann2

  • 1Institute of Chemistry, University of Potsdam, Karl-Liebknecht-Str. 24-25, D-14476 Golm, Germany.

The Journal of Physical Chemistry. B
|March 26, 2021
PubMed
Summary
This summary is machine-generated.

New hydrogels with a hierarchical structure were rapidly synthesized using a novel crosslinker and sulfobetaine monomer. Researchers characterized these advanced materials, revealing structural insights and developing new NMR methods for complex hydrogel analysis.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Biomaterials

Background:

  • Hydrogels are versatile materials with applications in drug delivery, tissue engineering, and soft robotics.
  • Designing hydrogels with controlled hierarchical structures is crucial for tailoring their mechanical and functional properties.
  • Existing characterization techniques can face challenges with complex hydrogel systems.

Purpose of the Study:

  • To synthesize and characterize novel hydrogels with a hierarchical structure.
  • To investigate the relationship between monomer-to-crosslinker ratio and hydrogel properties.
  • To develop advanced nuclear magnetic resonance (NMR) spectroscopy methods for analyzing complex hydrogels.

Main Methods:

  • Free radical polymerization using a novel diammonium dibromide crosslinker and a sulfobetaine monomer.
  • Rheological measurements to determine storage and loss moduli.
  • Cryo-scanning electron microscopy (Cryo-SEM), low-field NMR spectroscopy, and small-angle X-ray scattering (SAXS) for structural analysis.
  • Development of a novel NMR fitting approach to address challenges posed by gel inhomogeneity and monomer complexity.

Main Results:

  • Rapid synthesis of near-transparent hydrogels up to 5 cm in diameter.
  • Clear correlation observed between monomer-to-crosslinker ratio and hydrogel mechanical properties (storage and loss moduli).
  • Hierarchical structures identified across nano- to sub-millimeter scales using Cryo-SEM, NMR, and SAXS.
  • Successful application of a novel NMR fitting approach to analyze complex hydrogel systems.

Conclusions:

  • The study successfully prepared novel hierarchical hydrogels with tunable properties.
  • The findings highlight the importance of the monomer-to-crosslinker ratio in dictating hydrogel mechanics.
  • A new NMR methodology was established for overcoming challenges in analyzing inhomogeneous and chemically complex hydrogels.