Characterization of pressure driven voltage generation in ionic polymers (2017/1/30 福岡工業大学)



■講 師: Yuta Dobashi
■ご所属: Advanced Materials and Process Engineering Laboratory,
      Department of Electrical and Computer Engineering,
      The University of British Columbia (カナダ)

■演 題: Characterization of pressure driven voltage generation in ionic polymers

■日 時: 平成 29年 1 月 30日(月)14:40~16:10
■場 所: 福岡工業大学 A棟6階大学院ゼミ室

■主 催: 福岡工業大学 大学院工学研究科

  Conducting polymer based ionic actuators and sensors are emerging as promising candidates to fulfill the requirements to achieve authentic human-like robotic systems (soft robotics) and truly unobtrusive wearable and implantable sensor-actuator systems. This presentation discusses the fundamental theory of operation of ionic actuators based on electrochemical redox of polymers such as polypyrrole and poly(ethylene dioxythiophene). Moreover, the device’s reverse operation to achieve mechanical sensing, a phenomenon termed the piezoionic effect is described and characterized in various ionic polymers including polymer networks containing aqueous and organic electrolytes. Initial observations suggest that when an ion containing polymer is compressed, a concentration gradient is induced by the pressure differential, leading to an electrical potential difference detectable at electrodes placed at compressed and uncompressed portions of the polymer. The piezoionic transduction is investigated in terms of the effects of relative mobilities of the ions present in the system. The effective ion radii due to ion-solvent interactions and electrostatic ion-polymer interactions have been investigated for their contribution in dictating the piezoionic behavior by NMR measurements of the self-diffusion coefficients. The results are qualitatively correlated to the voltage response to mechanical compression of the polymer samples. Following the experiments, a numerical model is developed which incorporates the contributing events of the piezoionic effect. The deformation induced solvent flow is modeled by means of Biot’s constitutive equations on poroelasticity. The Darcy’s flow induced is then used as the input to model transport of dilute species. Finally, potential applications of the piezoionic polymers as soft sensors in medicine, particularly in unobtrusive and longitudinal monitoring of physical parameters, are discussed and some preliminary prototypes are introduced.

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