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Deformable and conformal silk hydrogel inverse opal.

Kyungtaek Min1, Sookyoung Kim1, Sunghwan Kim2,3

  • 1Department of Energy Systems Research, Ajou University, Suwon 16499, Republic of Korea.

Proceedings of the National Academy of Sciences of the United States of America
|June 1, 2017
PubMed
Summary

Researchers developed a new silk hydrogel photonic crystal (PhC) that is mechanically durable and tunable. This deformable material shows promise for bioapplications like artificial eyes, mimicking natural light manipulation.

Keywords:
intraocular pressure sensorocular prosthesisphotonic crystalphoto–cross-linkingsilk fibroin

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Area of Science:

  • Materials Science
  • Biotechnology
  • Optics

Background:

  • Photonic crystals (PhCs) offer nanoscale control over light.
  • Bioapplications require PhCs with mechanical durability, deformability, and biocompatibility, especially in challenging environments.

Purpose of the Study:

  • To introduce a novel deformable and conformal silk hydrogel inverse opal (SHIO) with tunable optical properties.
  • To assess its potential for bioapplications, including artificial ocular prostheses.

Main Methods:

  • Fabrication of the SHIO via UV cross-linking of a liquid stilbene/silk solution.
  • Characterization of the material's mechanical deformability and optical tuning capabilities under strain (stretching, bending, compressing).

Main Results:

  • The SHIO exhibits a tunable pseudophotonic band gap (pseudo-PBG) responsive to mechanical deformation.
  • The material is transparent, elastic, and mechanically durable.
  • Proof-of-concept demonstrated its potential as an ocular prosthesis.

Conclusions:

  • The developed SHIO is a promising material for advanced bioapplications requiring tunable photonic properties and mechanical resilience.
  • Its ability to mimic natural light-enhancing structures like the tapeta lucida opens new avenues for vision restoration and enhancement.