碳纳米管sem多大倍数

20-100万倍。碳纳米管，又名巴基管，是一种具有特殊结构（径向尺寸为纳米量级，轴向尺寸为微米量级，管子两端基本上都封口）的一维量子材料。碳纳米管sem20-100万倍之间连续可调，有很大的景深，视野大，成像富有立体感，可直接观察各种试样。

碳纳米管的独特结构决定了它具有许多特殊的物理和化学性质。组成碳纳米管的 C=C 共价键是自然界最稳定的化学键，所以使得碳纳米管具有非常优异的力学性能。理论计算表明，碳纳米管具有极高的强度和极大的韧性。其理论值估计杨氏模量可达 5TPa，强度约为钢的 100 倍，而重量密度却只有钢的 1/6。Treacy 等首次利用了 TEM 测量了温度从室温到 800 度变化范围内多壁碳纳米管的均方振幅，从而推导出多壁碳纳米管的平均杨氏模量约为 1.8Tpa。而 Salvetat 等测量了小直径的单壁碳纳米管的杨氏模量，并导出其剪切模量为 1Tpa。Wong 等用原子力显微镜测量多壁碳纳米管的弯曲强度平均值为 14.2±10.8GPa，而碳纤维的弯曲强度却仅有 1GPa。碳纳米管无论是强度还是韧性，都远远优于任何纤维，被认为是未来的“超级纤维”。

The main purpose is to research and experiment multi-walled carbon nanotubes (MWCNTs) / polycarbonate (PC) resin composite materials, the preparation methods and properties.

In order to improve the multi-walled carbon nanotubes and compatibility of resin, improve the polycarbonate multi-walled carbon nanotubes and polycarbonate resin, using the interface properties of sulfuric acid multi-walled carbon nanotubes surface modification. Using the infrared spectrum, X-ray photoelectron spectroscopy and thermogravimetric analysis of modified carbon nanotubes were the experimental data obtained will made by acid treatment of graph, the different time multi-walled carbon nanotubes are compared. Results show that the length of time, acid treatment effect of multi-walled carbon nanotubes, acid treatment time multi-walled carbon nanotubes were introduced in more active group, also can save the original carbon.

This experiment with solution for blending multi-walled carbon nanotubes/polycarbonate resin composites, use of composite FESEM microstructure observation. Will composite spinning and pure polycarbonate resin spinning. Results show that the polycarbonate resin spinnability, low multi-walled carbon nanotubes/polycarbonate resin composites is not suitable for spinning. Will multi-walled carbon nanotubes/polycarbonate resin composite pressure due to insufficient pressure molding process of mould effect is not ideal. Because the pressure by moulding machine, unstable, cause diaphragm contains a lot of bubbles.

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