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Exfoliated WS2-Nafion Composite based Electromechanical Actuators.

Masoud S Loeian1, Dominika A Ziolkowska2,3, Farhad Khosravi1

  • 1Small Systems Laboratory Department of Mechanical Engineering, Worcester Polytechnic Institute, Worcester, MA, 01609, USA.

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Summary

We developed novel tungsten disulfide (WS2)-Nafion nanocomposite actuators for efficient electro-mechanical energy conversion. These actuators show enhanced water uptake and mechanical properties, outperforming existing technologies.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Energy Conversion

Background:

  • Electromechanical actuators are crucial for energy conversion technologies.
  • Developing advanced materials with enhanced properties is essential for improving actuator performance.

Purpose of the Study:

  • To demonstrate the first liquid phase exfoliated WS2-Nafion nanocomposite based electromechanical actuators.
  • To investigate the structural, mechanical, and electromechanical properties of these novel nanocomposites.

Main Methods:

  • Liquid phase exfoliation of WS2 and mixing with Nafion solution.
  • Solution casting and Li+ doping of the nanocomposite.
  • Characterization using Resonant Raman spectroscopy, X-ray photo-electron-spectroscopy, differential scanning calorimetry, dynamic mechanical analysis, and AC impedance spectroscopy.

Main Results:

  • A 114% increase in elastic modulus, 160% increase in proton conductivity, and 300% increase in water uptake were observed.
  • Cyclic strain amplitudes of ~0.15% and tip displacements superior to nanotube-Nafion and graphene-Nafion actuators were achieved.
  • Continuous operation for over 5 hours was demonstrated, with enhanced water uptake attributed to oxygen atoms in WS2 vacancies.

Conclusions:

  • WS2-Nafion nanocomposites represent a promising new class of materials for high-performance electromechanical actuators.
  • The unique properties of WS2 contribute to improved water uptake and mechanical stability.
  • These findings open new avenues for advanced energy conversion devices.