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首页> 外文期刊>Journal of Alloys and Compounds: An Interdisciplinary Journal of Materials Science and Solid-state Chemistry and Physics >Complementary studies of structural characteristics for carbon materials with X-rays and neutrons
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Complementary studies of structural characteristics for carbon materials with X-rays and neutrons

机译：X射线和中子对碳材料结构特征的补充研究

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摘要

Carbon materials have a wide range of structures at an atomic and mesoscopic level that can be investigated by X-ray and thermal neutron scattering. New techniques are now available through the use of third-generation synchrotron radiation facilities and pulsed neutron sources. Examples are given for the study of activated carbons and carbon nanotubes that demonstrate the use of complementary features for the two radiation probes. The structural information is obtained as a pair correlation function from the diffraction measurements over a wide Q-range and the modern techniques use incident beams with a short wavelength of approx 0.1 A to achieve high Q-values, typically 50 A~(-1) for neutrons and 25 A~(-1) for X-rays. The Fourier transform yields a pair correlation function, d(r), with a much higher spatial resolution than can be achieved by other means and which gives quantitative data for direct modeling of the real-space structures. For the microporous carbons, there is also an interest in the low-Q region that defines the correlations on a much larger length scale and which relates to the complex pore network in these important commercial materials. Texture studies are also possible and have been used to study the alignment of carbon nanotubes in a templated alumina membrane.
机译：碳材料在原子和介观水平上具有广泛的结构，可以通过X射线和热中子散射进行研究。现在，通过使用第三代同步加速器辐射设施和脉冲中子源，可以获得新技术。给出了用于研究活性炭和碳纳米管的示例，这些示例演示了两个辐射探针互补特征的使用。结构信息是通过在宽Q范围内的衍射测量获得的成对相关函数而得到的，现代技术使用短波长约0.1 A的入射光束来获得高Q值，通常为50 A〜（-1）中子为25 A〜（-1）为X射线。傅立叶变换产生一个对相关函数d（r），其空间分辨率比其他方法所能实现的要高得多，并且它为直接对真实空间结构建模提供了定量数据。对于微孔碳，在低Q区域也有兴趣，它在更大的长度尺度上定义了相关性，并且与这些重要的商业材料中的复杂孔网络有关。纹理研究也是可能的，并且已经用于研究模板化氧化铝膜中碳纳米管的排列。

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