Herren Blake, Charara Mohammad, Saha Mrinal C, Altan M Cengiz, Liu Yingtao
School of Aerospace and Mechanical Engineering, University of Oklahoma, Norman, OK 73019, USA.
Nanomaterials (Basel). 2020 Jan 29;10(2):233. doi: 10.3390/nano10020233.
In this paper, polydimethylsiloxane (PDMS) and multi-walled carbon nanotube (MWCNT) nanocomposites with piezoresistive sensing function were fabricated using microwave irradiation. The effects of precuring time on the mechanical and electrical properties of nanocomposites were investigated. The increased viscosity and possible nanofiller re-agglomeration during the precuring process caused decreased microwave absorption, resulting in extended curing times, and decreased porosity and electrical conductivity in the cured nanocomposites. The porosity generated during the microwave-curing process was investigated with a scanning electron microscope (SEM) and density measurements. Increased loadings of MWCNTs resulted in shortened curing times and an increased number of small well-dispersed closed-cell pores. The mechanical properties of the synthesized nanocomposites including stress-strain behaviors and Young's Modulus were examined. Experimental results demonstrated that the synthesized nanocomposites with 2.5 wt. % MWCNTs achieved the highest piezoresistive sensitivity with an average gauge factor of 7.9 at 10% applied strain. The piezoresistive responses of these nanocomposites were characterized under compressive loads at various maximum strains, loading rates, and under viscoelastic stress relaxation conditions. The 2.5 wt. % nanocomposite was successfully used in an application as a skin-attachable compression sensor for human motion detection including squeezing a golf ball.
在本文中，采用微波辐射制备了具有压阻传感功能的聚二甲基硅氧烷（PDMS）和多壁碳纳米管（MWCNT）纳米复合材料。研究了预固化时间对纳米复合材料力学性能和电学性能的影响。预固化过程中粘度增加以及可能的纳米填料重新团聚导致微波吸收降低，从而使固化时间延长，并且固化后的纳米复合材料孔隙率和电导率降低。利用扫描电子显微镜（SEM）和密度测量研究了微波固化过程中产生的孔隙率。MWCNT负载量增加导致固化时间缩短以及小尺寸且分散良好的闭孔数量增加。研究了合成纳米复合材料的力学性能，包括应力 - 应变行为和杨氏模量。实验结果表明，含有2.5 wt.% MWCNT的合成纳米复合材料在10%的施加应变下实现了最高的压阻灵敏度，平均应变片系数为7.9。在各种最大应变、加载速率以及粘弹性应力松弛条件下的压缩载荷下对这些纳米复合材料的压阻响应进行了表征。含有2.5 wt.% MWCNT的纳米复合材料成功应用于可附着在皮肤上的压缩传感器，用于人体运动检测，包括挤压高尔夫球。
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