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构造煤13C NMR 谱及其结构成分的应力效应
构造煤 应力效应
2009/3/19
运用NMR(CP/MAS+TOSS)方法, 获得了不同类型构造煤的13C NMR高分辨谱. 在此基础上, 进行谱的拟合和峰的解叠, 求出各种碳官能团的相对含量, 并结合Ro, max, XRD和元素分析成果, 进一步研究了不同类型构造煤结构及成分变化的应力效应. 结果表明: Ro, max不仅是反映煤级的重要指标, 而且也是反映构造煤结构应力效应的有效指标. 煤大分子基本结构单元堆砌度Lc以及La...
Mechanism of CO32- substitution in carbonate-fluorapatite: Evidence from FTIR spectroscopy, 13C NMR, and quantum mechanical calculations---Reply to Nathan
Mechanism CO32- substitution carbonate-fluorapatite Evidence FTIR spectroscopy 13C NMR quantum mechanical calculations---Reply Nathan
2012/4/5
In the critical comment byNathan (1996), the author essentially claims that the samples used in our study (Regnier et al. 1994) werenot very appropriate to dem-onstrate the absence of C03P-. Furthermo...
Mechanism of CO32- substitution in carbonate-fluorapatite: Evidence from FTIR spectroscopy, 13C NMR, and quantum mechanical calculations---Discussion
Mechanism CO32- substitution carbonate-fluorapatite Evidence FTIR spectroscopy 13C NMR quantum mechanical calculations---Discussion
2012/4/5
The carbonate substitution in apatite continues to pro-voke controversies. In a recent paper, Regnier etal. (1994) challenged the existence of the hypothetical C03P- ion in carbonate-fluorapatite (fra...