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首页> 外文学位 >Experimental characterization and modeling of ionic polymer-metal composites as biomimetic actuators, sensors, and artificial muscles.
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Experimental characterization and modeling of ionic polymer-metal composites as biomimetic actuators, sensors, and artificial muscles.

机译：离子聚合物-金属复合材料作为仿生作动器，传感器和人造肌肉的实验表征和建模。

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摘要

Ionic polymer-metal composites (IPMCs) are soft bending actuators and sensors. A typical IPMC consists of a thin perfluorinated ionomer membrane, noble metal electrodes plated on both faces, and is neutralized with the necessary amount of cations. They respond to electric stimulus by generating large bending motions and produce electric signals upon sudden bending deformations. These actuation and sensing responses, which result from the coupled chemo-electro-mechanical interactions at the nano-scale level, depend on the structure of the ionomer, the morphology of the metal electrodes, the nature of the cations, and the degree of the hydration. IPMCs have been considered for potential applications in artificial muscles, robotic systems, medical devices, and other biomimetic applications.; A series of systematic experimental characterizations are performed on both Nafion- and Flemion-based IPMCs in various cation forms. Compared with Nafion-based IPMCs, Flemion-based IPMCs with fine dendritic gold electrodes have higher ion-exchange capacity, better surface conductivity, higher hydration capacity, and higher longitudinal stiffness. Flemion-based IPMCs show a greater bending deformation towards the anode without back relaxation under a DC voltage. This displacement towards the anode is linearly related to the charge accumulation at the cathode. In contrast, Nafion-based IPMCs in alkali-metal cations initially have a fast bending towards the anode, followed by a slow relaxation in the opposite direction as charges continue to move towards the cathode boundary layer.; Based on the understanding of the factors that affect IPMCs' performance, novel methods to tailor the IPMCs' electro-mechanical responses are developed. By modifying the associated cations, i.e., introducing various single cations (including alkali-metal, alkyl-ammonium, or multivalent metal cations) and cation combinations, diverse actuation behaviors can be obtained and optimized. The actuation motions of IPMCs can also be tailored through the applied DC or AC functions. It is found that the Nafion-based IPMC's initial motion towards the anode can be controlled and ultimately eliminated by applying a potential ramp at a suitably slow rate. These results have significant bearing on verifying various IPMC actuation models.
机译：离子聚合物金属复合材料（IPMC）是软弯曲致动器和传感器。典型的IPMC由薄的全氟化离聚物膜，镀在两面上的贵金属电极组成，并用必要量的阳离子中和。它们通过产生较大的弯曲运动来响应电刺激，并在突然弯曲变形时产生电信号。这些致动和传感响应是由纳米级的化学-电-机械耦合相互作用产生的，取决于离聚物的结构，金属电极的形态，阳离子的性质以及阳离子的程度。保湿。 IPMC已被考虑在人造肌肉，机器人系统，医疗设备和其他仿生应用中的潜在应用。在基于Nafion和Flemion的IPMC上以各种阳离子形式进行了一系列系统的实验表征。与基于Nafion的IPMC相比，具有精细的树枝状金电极的基于Flemion的IPMC具有更高的离子交换能力，更好的表面电导率，更高的水合作用能力和更高的纵向刚度。基于Flemion的IPMC在直流电压下向阳极显示出更大的弯曲变形，而没有向后松弛。朝阳极的这种位移与阴极上的电荷积累线性相关。相反，碱金属阳离子中基于Nafion的IPMC最初会快速向阳极弯曲，然后随着电荷继续向阴极边界层移动而沿相反方向缓慢松弛。基于对影响IPMC性能的因素的理解，开发了定制IPMC机电响应的新颖方法。通过修饰相关的阳离子，即引入各种单一阳离子（包括碱金属，烷基铵或多价金属阳离子）和阳离子组合，可以获得并优化各种致动行为。 IPMC的驱动运动也可以通过应用的DC或AC功能进行定制。发现基于Nafion的IPMC向阳极的初始运动可以通过以适当慢的速率施加电势斜坡来控制并最终消除。这些结果对验证各种IPMC驱动模型具有重要意义。

著录项

  • 作者

    Wu, Yongxian.;

  • 作者单位

    University of California, San Diego.;

  • 授予单位 University of California, San Diego.;
  • 学科 Engineering Mechanical.; Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2005
  • 页码 189 p.
  • 总页数 189
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 机械、仪表工业;工程材料学;
  • 关键词

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