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Fully Bioabsorbable Natural-Materials-Based Triboelectric Nanogenerators.

Wen Jiang1,2, Hu Li1,2,3,4, Zhuo Liu1,2,3,4

  • 1CAS Center for Excellence in Nanoscience, Beijing Institute of Nanoenergy and Nanosystems, Chinese Academy of Sciences, Beijing, 100083, P. R. China.

Advanced Materials (Deerfield Beach, Fla.)
|June 28, 2018
PubMed
Summary

Researchers developed fully bioabsorbable natural-materials-based triboelectric nanogenerators (BN-TENGs) for implantable medical devices. These biodegradable power sources can treat heart conditions by stimulating cardiomyocyte function.

Keywords:
bioabsorbablebiodegradablenatural materialstransient electronicstriboelectric nanogenerators

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Area of Science:

  • Biomedical Engineering
  • Materials Science
  • Energy Harvesting

Background:

  • Implantable medical devices are crucial for treating neurological and cardiovascular diseases.
  • The advancement of transient electronics necessitates novel power sources that are biocompatible, controllable, and bioabsorbable.
  • Existing power sources for implantable devices often require secondary surgeries for removal, posing risks.

Purpose of the Study:

  • To develop fully bioabsorbable natural-materials-based triboelectric nanogenerators (BN-TENGs) as a sustainable power source for implantable medical devices.
  • To establish a ranking of natural materials based on their triboelectric properties for optimized device design.
  • To demonstrate the in vivo bioabsorbability and therapeutic potential of BN-TENGs for cardiovascular applications.

Main Methods:

  • Ranking of five natural materials based on their triboelectric properties to create a "triboelectric series".
  • Fabrication and testing of single-material and pairwise combination BN-TENGs to evaluate triboelectric outputs.
  • Modification of silk fibroin encapsulation for tunable device operation time.
  • In vivo degradation and resorption studies in Sprague-Dawley rats.
  • Application of BN-TENGs to stimulate cardiomyocyte clusters and assess therapeutic effects.

Main Results:

  • A "triboelectric series" for five natural materials was established, guiding material selection.
  • BN-TENGs achieved significant triboelectric outputs, with maximum voltage, current, and power density reaching 55 V, 0.6 µA, and 21.6 mW m-2, respectively.
  • Silk fibroin encapsulation allowed for tunable operation from days to weeks.
  • The BN-TENGs were fully degraded and resorbed in vivo without adverse effects.
  • Stimulation with BN-TENGs improved beating rates and contraction consistency in dysfunctional cardiomyocyte clusters.

Conclusions:

  • Fully bioabsorbable natural-materials-based triboelectric nanogenerators (BN-TENGs) offer a promising biocompatible and biodegradable power solution for transient implantable medical devices.
  • The established "triboelectric series" provides valuable insights for designing efficient triboelectric nanogenerators using natural materials.
  • BN-TENGs demonstrate potential as a non-invasive therapeutic tool for cardiovascular conditions like bradycardia and arrhythmia, eliminating the need for secondary surgeries.