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Related Experiment Video

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Ultrasoft, highly deformable microgels.

Haylee Bachman1, Ashley C Brown, Kimberly C Clarke

  • 1School of Chemistry and Biochemistry, Georgia Institute of Technology, Atlanta, GA 30332, USA.

Soft Matter
|February 5, 2015
PubMed
Summary
This summary is machine-generated.

Ultralow crosslinked (ULC) microgels, synthesized without crosslinking agents, exhibit remarkable softness and deformability. These properties make ULC microgels highly suitable for advanced biomedical applications, including drug delivery and regenerative medicine.

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Area of Science:

  • Soft Matter Physics
  • Polymer Science
  • Materials Science

Background:

  • Microgels are versatile hydrogel microparticles with tunable properties.
  • Poly(N-isopropylacrylamide) (pNIPAm) microgels are commonly synthesized using crosslinkers like N,N'-methylenebisacrylamide (BIS).
  • Alternative synthesis routes are explored to create microgels with unique characteristics.

Purpose of the Study:

  • To investigate the properties of microgels synthesized under 'crosslinker free' conditions.
  • To characterize the mechanical and deformability attributes of ultralow crosslinked (ULC) microgels.
  • To explore the potential of ULC microgels in biomedical applications.

Main Methods:

  • Precipitation polymerization of pNIPAm and acrylic acid (AAc) under crosslinker-free conditions.
  • Atomic Force Microscopy (AFM) nanoindentation to determine Young's modulus.
  • Assessment of particle deformability through surface spreading and nanopore translocation.

Main Results:

  • ULC microgels exhibit extremely low, core-localized crosslinking (<0.5%).
  • AFM nanoindentation reveals a Young's modulus of approximately 10 kPa, indicating significant softness.
  • ULC microgels demonstrate high deformability, evidenced by spreading on glass and translocation through small nanopores.
  • Particle size and charge are readily tunable by adjusting reaction parameters and co-monomer content.
  • Crosslinker-free polyethylene glycol (PEG) microgels can also be synthesized.

Conclusions:

  • ULC microgels possess unique softness and deformability, distinct from traditionally crosslinked counterparts.
  • The ability to tune ULC microgel properties makes them adaptable for various applications.
  • ULC microgels represent a promising class of biomaterials for drug delivery and regenerative medicine due to their unique characteristics.