...
  • 主题
高级搜索  >
历史搜索 清空历史
首页> 外文期刊>Smart Materials & Structures >Quasi-static and dynamic strain sensing using carbon nanotube/epoxy nanocomposite thin films
【24h】

Quasi-static and dynamic strain sensing using carbon nanotube/epoxy nanocomposite thin films

机译：使用碳纳米管/环氧树脂纳米复合薄膜的准静态和动态应变感测

获取原文
获取原文并翻译 | 示例
           
页面导航
  • 摘要
  • 著录项
  • 相似文献
  • 相关主题

摘要

Thin films are developed by dispersing carbon black nanoparticles and carbon nanotubes (CNTs) in an epoxy polymer. The films show a large variation in electrical resistance when subjected to quasi-static and dynamic mechanical loading. This phenomenon is attributed to the change in the band-gap of the CNTs due to the applied strain, and also to the change in the volume fraction of the constituent phases in the percolation network. Under quasi-static loading, the films show a nonlinear response. This nonlinearity in the response of the films is primarily attributed to the pre-yield softening of the epoxy polymer. The electrical resistance of the films is found to be strongly dependent on the magnitude and frequency of the applied dynamic strain, induced by a piezoelectric substrate. Interestingly, the resistance variation is found to be a linear function of frequency and dynamic strain. Samples with a small concentration of just 0.57% of CNT show a sensitivity as high as 2.5% MPa-1 for static mechanical loading. A mathematical model based on Bruggeman's effective medium theory is developed to better understand the experimental results. Dynamic mechanical loading experiments reveal a sensitivity as high as 0.007% Hz(-1) at a constant small-amplitude vibration and up to 0.13%/mu-strain at 0-500 Hz vibration. Potential applications of such thin films include highly sensitive strain sensors, accelerometers, artificial neural networks, artificial skin and polymer electronics.
机译：通过将炭黑纳米颗粒和碳纳米管（CNT）分散在环氧聚合物中来开发薄膜。当受到准静态和动态机械负载时，这些膜的电阻显示出很大的变化。该现象归因于由于施加的应变导致的CNT的带隙的变化，并且还归因于渗滤网络中组成相的体积分数的变化。在准静态载荷下，薄膜表现出非线性响应。薄膜响应中的这种非线性主要归因于环氧聚合物的预屈服软化。发现膜的电阻强烈依赖于由压电基板引起的施加的动态应变的大小和频率。有趣的是，发现电阻变化是频率和动态应变的线性函数。浓度仅为0.57％的CNT的样品对静态机械载荷的灵敏度高达2.5％MPa-1。建立了基于布鲁格曼有效介质理论的数学模型，以更好地理解实验结果。动态机械载荷实验表明，在恒定的小振幅振动下，灵敏度高达0.007％Hz（-1），在0-500 Hz振动下，灵敏度高达0.13％/ mu-应变。这种薄膜的潜在应用包括高度敏感的应变传感器，加速度计，人工神经网络，人工皮肤和高分子电子产品。

著录项

相似文献

  • 外文文献
  • 中文文献
  • 专利
获取原文

客服邮箱：kefu@zhangqiaokeyan.com

京公网安备：11010802029741号 ICP备案号：京ICP备15016152号-6 六维联合信息科技 (北京) 有限公司©版权所有

  • 客服微信

  • 服务号