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Simultaneous Synthesis of Single-walled Carbon Nanotubes and Graphene in a Magnetically-enhanced Arc Plasma
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Published on: February 2, 2012

石墨转化为多壁碳纳米管的热力学.

Daniele Gozzi1, Massimiliano Iervolino, Alessandro Latini

  • 1Dipartimento di Chimica, Università di Roma La Sapienza, Piazzale Aldo Moro 5, 00185 Roma, Italy. daniele.gozzi@uniromal.it

Journal of the American Chemical Society
|August 2, 2007
PubMed
概括

从石墨到多壁碳纳米管 (MWCNTs) 的转化在704K以上是自发的.使用电机力和DSC的热力学分析揭示了此转换的关键和值.

科学领域:

  • 材料科学 材料科学 材料科学
  • 热力学是一种热力学.
  • 纳米技术纳米技术

背景情况:

  • 了解碳全方位转换的热力学驱动力对于材料合成至关重要.
  • 多壁碳纳米管 (MWCNTs) 具有独特的特性,但它们从石墨中合成需要详细的热力学评估.

研究的目的:

  • 量化确定与石墨转化为多壁碳纳米管 (MWCNTs) 相关的热力学参数.
  • 为了确定这种变化在热力学上自发的温度范围.

主要方法:

  • 使用具有CaF2作为固体电解质的电池进行电机力 (emf) 测量.
  • 微分扫描热量计 (DSC) 用于测量转变度,特别是在从石墨和MWCNT中形成Mn7C3期间.
  • 将热力学数据推断到标准条件 (298K和0K).

主要成果:

  • 电机力测量结果显示Delta (r) H (t) 度=8.25 ± 0.09 kJ/mol,而Delta (r) S (t) 度=11.72 ± 0.09 J/K·mol在874 K.
  • 在298 K的平均热力学值是Delta{r}H{298}度=9.0 ± 0.8 kJ/mol和Delta{r}S{298}度≈11.7 J/K·mol.
  • 从石墨到MWCNT的转化在704 ± 13 K以上变得自发.

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结论:

  • 该研究为石墨转化为MWCNT提供了关键的热力学数据.
  • 这些发现证实了在特定条件下从石墨中合成MWCNT的可行性.
  • 计算的热力学值与理论预测一致,验证了实验方法.