Department of Polymer Engineering, Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-114, Tehran, Islamic Republic of Iran.
Department of Polymer Engineering, Faculty of Chemical Engineering, Tarbiat Modares University, P.O. Box 14115-114, Tehran, Islamic Republic of Iran.
Carbohydr Polym. 2018 Dec 1;201:228-235. doi: 10.1016/j.carbpol.2018.08.054. Epub 2018 Aug 13.
In this work, in-situ biosynthesized bacterial cellulose (BC) /multiwall carbon nanotubes (MWCNTs) nanocomposite hydrogels converted to the conductive nanocomposite aerogels via the supercritical CO method. A low percolation threshold value of 0.0041 (volume concentration) predicted for BC/MWCNTs nanocomposite aerogels by the proposed modified model. The piezoresistive behavior of the nanocomposite aerogel at percolation threshold, evaluated in tension mode. The strain sensing outcomes revealed a linear trend during loading until a critical strain, afterward began to decline with further increasing of strain. Moreover, by applying loading unloading cyclic tension for 10 times at two different strain amplitudes (2% and 8%), the variation of relative resistance was different. This attributed to the rearrangement of MWCNTs at high strain condition. The gauge factor of 21 and response time of 390 ms obtained for flexible lightweight strain sensor. The fabricated strain sensor utilized to monitor human detection motion.
在这项工作中，通过超临界 CO2 方法将原位生物合成的细菌纤维素 (BC)/多壁碳纳米管 (MWCNTs) 纳米复合水凝胶转化为导电纳米复合气凝胶。通过提出的改进模型，预测 BC/MWCNTs 纳米复合气凝胶的渗流阈值值为 0.0041（体积浓度）。在渗流阈值下评估纳米复合气凝胶的压阻行为，在拉伸模式下进行。应变传感结果表明，在加载过程中呈线性趋势，直到达到临界应变，然后随着应变的进一步增加开始下降。此外，通过在两个不同应变幅度（2%和 8%）下应用 10 次加载-卸载循环拉伸，相对电阻的变化不同。这归因于在高应变条件下 MWCNTs 的重新排列。获得了 21 的应变系数和 390 ms 的响应时间，用于制造柔性轻质应变传感器。所制造的应变传感器用于监测人体检测运动。
