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Super-Resolving Particle Diffusion Heterogeneity in Porous Hydrogels via High-Speed 3D Active-Feedback

Yuxin Lin1, Haoting Lin1, Kevin D Welsher1

  • 1Department of Chemistry, Duke University, 124 Science Dr., Durham, NC, 27708, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|August 16, 2025
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Summary

Researchers used 3D Single-Molecule Active-feedback Real-time Tracking (3D-SMART) microscopy to observe nanoparticle diffusion in 3D porous structures. This revealed "hopping diffusion" and detailed hydrogel microstructure dynamics.

Keywords:
3D microscopyactive‐feedback trackinghopping diffusionmicrorheologyreal‐time single particle tracking

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Biophysics

Background:

  • Nanoparticle diffusion in porous media is crucial for many applications.
  • Traditional microscopy limits understanding of these dynamics in 3D.
  • Porous structure characterization requires advanced tracking techniques.

Purpose of the Study:

  • To investigate nanoparticle diffusion in 3D porous structures using advanced microscopy.
  • To reveal the mechanisms of nanoparticle movement within hydrogels.
  • To characterize the microstructure of porous materials through diffusion analysis.

Main Methods:

  • Utilized 3D Single-Molecule Active-feedback Real-time Tracking (3D-SMART) microscopy.
  • Achieved super-resolution imaging (≈10 nm in XY, ≈30 nm in Z).
  • Acquired long, highly sampled nanoparticle trajectories in agarose gels.

Main Results:

  • Observed and characterized

Conclusions:

  • 3D-SMART microscopy provides unprecedented spatiotemporal resolution for nanoparticle tracking.
  • The study elucidates hopping diffusion and hydrogel microstructure.
  • Findings have broad implications for drug delivery, material science, and biological systems.