材料科学
标度系数
弹性体
应变计
复合材料
模数
碳纳米管
基质(水族馆)
电阻器
拉伤
制作
电压
病理
地质学
内科学
替代医学
物理
海洋学
医学
量子力学
作者
Nanshu Lu,Chi Lu,Jing Wang,John A. Rogers
标识
DOI:10.1002/adfm.201200498
摘要
Abstract Quantifying naturally occurring strains in soft materials, such as those of the human body, requires strain gauges with equal or greater mechanical compliance. This manuscript reports materials and mechanics approaches are reported for an all‐elastomer strain measurement device with gauge factor as high as 29 and with Young's modulus that approaches that of the human epidermis. These systems use thin carbon‐black‐doped poly(dimethylsiloxane) (CB‐PDMS) for the strain gauges due to its high resistivity and strong dependence on strain, and thick carbon‐nanotube‐doped PDMS (CNT‐PDMS) for the interconnects due to its comparatively low resistivity and weak dependence on strain. Devices composed of molded, straight resistors of CB‐PDMS joined by serpentine‐shaped interconnects of CNT‐PDMS, both in a matrix substrate of PDMS, have electrical responses that depend almost entirely on the strain in the CB‐PDMS. Integrated structures of this type have Young's moduli of 244 kPa, which lies within the range of values for the human epidermis. Such sheets can be readily laminated on and form conformal contact to the human skin, with only modest mechanical constraints on natural motions. Strains measured in this mode on the wrist are between 11.2% and 22.6%.
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