Carbon Nanotubes with Temperature-Invariant Viscoelasticity from-196° to 1000°C
Carbon Nanotubes with Temperature-Invariant Viscoelasticity from-196° to 1000°C
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DOI：
10.1126/science.1194865
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发表时间：
2010-12-03
期刊：
影响因子：
56.9
通讯作者：
Hata, Kenji
中科院分区：
文献类型：
--
作者：
Xu, Ming;Futaba, Don N.;Hata, Kenji
粘弹性描述了材料同时具有弹性和粘性的能力。粘弹性材料，如橡胶，具有有限的工作温度范围（例如，硅橡胶的工作温度范围为-55℃至300℃），高于该温度范围材料会分解，低于该温度范围材料会发生玻璃化转变并变硬。我们创造了一种粘弹性材料，由长互联碳纳米管随机网络组成，其工作温度范围为-196度至1000度。从-140度到600度，存储和损耗模量、频率稳定性、可逆变形水平和抗疲劳性都是不变的。我们解释说，热稳定性源于碳纳米管在接触处的拉链和解拉链的能量耗散。
Viscoelasticity describes the ability of a material to possess both elasticity and viscosity. Viscoelastic materials, such as rubbers, possess a limited operational temperature range (for example, for silicone rubber it is -55 degrees to 300 degrees C), above which the material breaks down and below which the material undergoes a glass transition and hardens. We created a viscoelastic material composed from a random network of long interconnected carbon nanotubes that exhibited an operational temperature range from -196 degrees to 1000 degrees C. The storage and loss moduli, frequency stability, reversible deformation level, and fatigue resistance were invariant from -140 degrees to 600 degrees C. We interpret that the thermal stability stems from energy dissipation through the zipping and unzipping of carbon nanotubes at contacts.