Structural studies of activated carbons by pulsed neutron diffraction
Structural studies of activated carbons by pulsed neutron diffraction
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通过脉冲中子衍射研究活性炭的结构
DOI：
10.1088/0953-8984/11/47/306
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发表时间：
1999
期刊：
影响因子：
--
通讯作者：
D. Cazorla
中科院分区：
文献类型：
--
作者：
J. Dore;M. Sliwinski;A. Burian;W. Howells;D. Cazorla
给出了一系列具有可变微孔率的活性碳的脉冲中子衍射结果。结果覆盖了高达50A-1的宽Q范围，并使对关联函数能够以良好的空间分辨率进行评估。衍射图显示了一个代表高度缺陷晶体结构的宽广的振荡行为，与石墨有很大的不同。详细的研究表明，局域原子结构类似于石墨的原子结构，呈现预期的六方网状结构，但从碳-碳键产生的第一个峰有两个组分，表明该网状结构具有二次曲面扭曲。石墨烯片层内的相关长度较短，层间距也表现出一定的无序性，与石墨相比，层间距增大。这些数据为结构的详细建模提供了良好的基础，并展示了其他技术不容易观察到的特征。
Pulsed neutron diffraction results are presented for a series of activated carbons with a variable microporosity. The results cover a wide Q-range extending up to 50 A-1 and enable the pair correlation function to be evaluated with good spatial resolution. The diffraction pattern shows a broad oscillatory behaviour representative of a highly defective crystal structure and differs considerably from graphite. Detailed investigation shows that the local atomic structure is similar to that of graphite and exhibits the expected hexagonal network but that the first peak arising from the carbon-carbon bond has two components, indicating a quinoidal distortion of the network. The correlation length within the graphene sheet is short ranged and the inter-layer spacing also displays some disorder with an increased spacing compared with graphite. The data provide a good basis for the detailed modelling of the structure and exhibit characteristics that could not have been easily observed by other techniques.