Multi-scale numerical simulations of thermal expansion properties of CNT-reinforced nanocomposites.
Multi-scale numerical simulations of thermal expansion properties of CNT-reinforced nanocomposites.
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DOI：
10.1186/1556-276x-8-15
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发表时间：
2013-01-07
影响因子：
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通讯作者：
Zhang Y
中科院分区：
文献类型：
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作者：
Alamusi A;Hu N;Qiu J;Li Y;Chang C;Atobe S;Fukunaga H;Liu Y;Ning H;Wu L;Li J;Yuan W;Watanabe T;Yan C;Zhang Y
在这项工作中，使用多尺度数值方法评估了碳纳米管（CNT）含量范围为1至15重量%的碳纳米管（CNT）增强纳米复合材料的热膨胀性能，其中两个参数的影响，即，温度和CNT含量进行了广泛的研究。对于所有CNT含量，所获得的结果清楚地显示，在宽的低温范围（30°C ~ 62°C）内观察到热收缩，而在高温范围（62°C ~ 120°C）内发生热膨胀。发现在任何指定的CNT含量下，热膨胀性质随温度而变化-随着温度增加，热膨胀速率线性增加。然而，在特定温度下，热膨胀率的绝对值随着CNT含量的增加而非线性地减小。此外，该多尺度数值模型的计算结果与相应的理论分析和实验测量结果吻合较好，这表明，这种多尺度数值方法提供了一个强大的工具，以评估任何类型的碳纳米管/聚合物纳米复合材料的热膨胀性能，从而促进了对碳纳米管/聚合物纳米复合材料的热行为的理解。聚合物纳米复合材料在温度传感器、纳米电子器件等方面的应用。
In this work, the thermal expansion properties of carbon nanotube (CNT)-reinforced nanocomposites with CNT content ranging from 1 to 15 wt% were evaluated using a multi-scale numerical approach, in which the effects of two parameters, i.e., temperature and CNT content, were investigated extensively. For all CNT contents, the obtained results clearly revealed that within a wide low-temperature range (30°C ~ 62°C), thermal contraction is observed, while thermal expansion occurs in a high-temperature range (62°C ~ 120°C). It was found that at any specified CNT content, the thermal expansion properties vary with temperature - as temperature increases, the thermal expansion rate increases linearly. However, at a specified temperature, the absolute value of the thermal expansion rate decreases nonlinearly as the CNT content increases. Moreover, the results provided by the present multi-scale numerical model were in good agreement with those obtained from the corresponding theoretical analyses and experimental measurements in this work, which indicates that this multi-scale numerical approach provides a powerful tool to evaluate the thermal expansion properties of any type of CNT/polymer nanocomposites and therefore promotes the understanding on the thermal behaviors of CNT/polymer nanocomposites for their applications in temperature sensors, nanoelectronics devices, etc.