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arXiv 0706.0428cond-mat.mtrl-sci
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碳纳米角中氢分子束缚态的性质

Nature of the bound states of molecular hydrogen in carbon nanohorns

Felix Fernandez-Alonso, F. Javier Bermejo, Carlos Cabrillo, Raouf O. Loutfy, Vincent Leon, Marie-Louise Saboungi

摘要:

通过高分辨准弹性和非弹性中子能谱研究了碳纳米角中氢分子的限制效应。这两组数据与在液态和结晶态的批量样品中获得的数据显着不同。在散装氢是液体的温度下,受限制的样品的光谱示出了弹性分量,指示固定分子的显著比例以及明显更窄的准弹性线宽和对位-邻位旋转转变的线形的强烈扭曲。结果表明,氢与这种碳结构的相互作用比与碳纳米管的相互作用强得多,这表明纳米角和相关的纳米结构作为储氢应用的轻质介质可能提供更好的前景。

英文摘要:

The effects of confining molecular hydrogen within carbon nanohorns are studied via high-resolution quasielastic and inelastic neutron spectroscopies. Both sets of data are remarkably different from those obtained in bulk samples in the liquid and crystalline states. At temperatures where bulk hydrogen is liquid, the spectra of the confined sample show an elastic component indicating a significant proportion of immobile molecules as well as distinctly narrower quasielastic line widths and a strong distortion of the line shape of the para - ortho rotational transition. The results show that hydrogen interacts far more strongly with such carbonous structures than it does to carbon nanotubes, suggesting that nanohorns and related nanostructures may offer significantly better prospects as lightweight media for hydrogen storage applications.

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