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首页> 外文学位 >Thermodynamic study of one and two dimensional neon adsorbed on single -walled carbon nanotube bundles.
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Thermodynamic study of one and two dimensional neon adsorbed on single -walled carbon nanotube bundles.

机译：单壁碳纳米管束吸附一维和二维氖的热力学研究。

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摘要

In this dissertation I report the results of thermodynamic measurements performed on Neon (Ne) films adsorbed on HiPCo(TM) single-walled, closed-end, purified carbon nanotube bundles. The heat capacity was measured for 17 coverages between 0.015 and 1.2 single atomic layers, for 1.8 K < T < 19 K. A few complementary adsorption isotherms were measured on the same cell over a similar range of coverages, for 17.8 K < T < 27.9 K. The results indicate that Ne deposits, in order, in high binding energy sites, the grooves on the outside of the bundles, the surface of the outer nanotubes, and after compressing the fully completed monolayer, on a second layer. All of the films show solid-like behavior in the range studied. For the lowest coverages, possible excitation energies and Debye temperatures from a one dimensional model have been estimated. For the higher coverage films, I have calculated two-dimensional Debye temperatures and compared to results obtained on Ne adsorbed on flat graphite (Grafoil(TM)). The 2d isothermal compressibility of the films near monolayer completion has been estimated from vapor pressure isotherms at 19.2 K. Agreement is found between the monolayer completion coverage inferred from the heat capacity isotherms and a minimum in the compressibility. In spite of the solid-like behavior and similarities to Ne/graphite, I do not observe any phase transition in the range of temperatures and coverages studied, analogous to the sublimation, melting and vaporization transitions of Ne in two dimensions.
机译：在本文中，我报告了对吸附在HiPCo™单壁，封闭端，纯化碳纳米管束上的氖（Ne）膜进行热力学测量的结果。测量了0.015和1.2个单原子层之间的17个覆盖范围的热容，即1.8 K

著录项

  • 作者

    Ramachandran, Subramanian.;

  • 作者单位

    University of Washington.;

  • 授予单位 University of Washington.;
  • 学科 Condensed matter physics.
  • 学位 Ph.D.
  • 年度 2008
  • 页码 184 p.
  • 总页数 184
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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