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Self-healing gelatin ionogels.

Anshu Sharma1, Kamla Rawat2, Pratima R Solanki3

  • 1School of Physical Sciences, Jawaharlal Nehru University, New Delhi, India; Special Centre for Nanosciences, Jawaharlal Nehru University, New Delhi, India.

International Journal of Biological Macromolecules
|December 3, 2016
PubMed
Summary

This study shows gelatin ionogels can self-heal at room temperature, recovering significant gel rigidity within 10 hours without external stimuli. This breakthrough offers potential for biomedical engineering applications.

Keywords:
IonogelRecoveryRheologySelf-healing gelStorage modulus

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Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Polymer Chemistry

Background:

  • Gelatin, a polypeptide, is a biocompatible and biodegradable material.
  • Ionogels are polymer networks swollen with ionic liquids.
  • Self-healing materials can autonomously repair damage, extending their lifespan and utility.

Purpose of the Study:

  • To investigate the self-healing properties of gelatin ionogels at room temperature.
  • To understand the mechanisms behind the observed self-healing.
  • To evaluate the potential of these ionogels for biomedical applications.

Main Methods:

  • Gelatin ionogels were prepared using 1-ethyl-3-methylimidazolium chloride ionic liquid (IL) via thermal treatment (IL concentration ≤5% w/v).
  • The self-healing capability was assessed by cutting the ionogels and monitoring the recovery of gel rigidity at 20°C.
  • The healing rate was determined by measuring the growth of the rigidity modulus over time.

Main Results:

  • Gelatin ionogels exhibited significant self-healing at room temperature (20°C), recovering 68-96% of their rigidity after being cut.
  • Complete healing occurred within approximately 10 hours under ambient conditions without any external stimuli.
  • The self-healing mechanism involves the reformation of network structures through charge quenching and hydrophobic interactions mediated by the ionic liquid.
  • The healing rate was measured at 20±5 mPa/s and was independent of the ionic liquid content.

Conclusions:

  • Gelatin ionogels demonstrate remarkable autonomous self-healing capabilities at room temperature.
  • The observed self-healing is attributed to specific interactions within the ionogel network facilitated by the ionic liquid.
  • These biocompatible and biodegradable ionogels show significant promise for advanced applications in biomedical engineering.