High Energy Density Nastic Materials: Parameters for Tailoring Active Response
High Energy Density Nastic Materials: Parameters for Tailoring Active Response
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DOI：
10.1177/1045389x08092276
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发表时间：
2009-01-01
影响因子：
2.7
通讯作者：
Weiland, Lisa Mauck
中科院分区：
文献类型：
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作者：
Freeman, Eric;Weiland, Lisa Mauck
所考虑的工程活性材料模仿了类似于植物界中的自然运动的整体变形。利用生物过程控制电荷和流体穿过选择性渗透膜的传输，以实现整体变形。该膜可以包含生物离子泵、离子通道和围绕聚合物基质中的球形内含物的离子交换器；在本研究中仅考虑离子泵和交换器。这项工作检查了对采用活性材料的设计具有重要意义的参数，包括自由应变、阻塞应力、阻抗匹配功和响应率。不同材料设计参数（例如系统几何形状和膜渗透性）的影响被认为有助于适合给定应用的活性材料的定制设计。预测表明，初始响应速率可能约为毫秒，阻抗匹配功超过 200 kJ/m(3)。
The engineered active material considered mimics bulk deformation similar to nastic movements in the plant kingdom. Controlled transport of charge and fluid across a selectively permeable membrane employing biological processes is employed to achieve bulk deformation. The membrane may contain biological ion pumps, ion channels, and ion exchangers surrounding a spherical inclusion in a polymer matrix; in this study only ion pumps and exchangers are considered. This work examines parameters of significance to designs employing active materials, including free strain, blocked stress, impedance matched work, and rate of response. The effects of varying material design parameters, such as system geometry and membrane permeability are considered to aid in the custom design of an active material appropriate to a given application. Predictions suggest that the rate of initial response may be on the order of msec with impedance matched work in excess of 200 kJ/m(3).