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Area of Science:

  • Materials Science
  • Biomaterials Engineering
  • Nanotechnology

Background:

  • Developing responsive materials for sensing applications is crucial.
  • Nanoparticle hydrogels offer tunable properties for advanced applications.
  • Protease-responsive materials are needed for targeted drug delivery and diagnostics.

Purpose of the Study:

  • To report a tunable protease-responsive nanoparticle hydrogel (PRNH).
  • To investigate the degradation-directed assembly mechanism of nanoparticles within the hydrogel.
  • To establish design rules for tunable structural color changes in PRNHs.

Main Methods:

  • Fabrication of structurally colored composites using silica particles, 4-arm poly(ethylene glycol) norbornene (4PEGN), and a proteolytically degradable peptide.
  • Investigating the effect of particle surface charge and size on the assembly mechanism.
  • Utilizing ultra-small angle X-ray scattering to analyze structural changes upon degradation.

Main Results:

  • PRNHs exhibit large, non-iridescent color changes upon protease-induced degradation.
  • Negative particle surface charge is critical for observing color changes.
  • Degradation leads to polymer coating of particles and assembly into amorphous arrays.
  • Particle diameter and polymer concentration modulate color and swelling, respectively.

Conclusions:

  • Degradation-directed assembly of nanoparticles in PRNHs enables tunable structural color changes.
  • Surface charge, particle size, and polymer concentration are key parameters for designing these responsive materials.
  • This work provides a framework for creating novel protease-responsive materials with adjustable optical properties.