Neutron Polarization Analysis for Biphasic Solvent Extraction Systems
Neutron Polarization Analysis for Biphasic Solvent Extraction Systems
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DOI：
10.1080/07366299.2016.1201980
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发表时间：
2016-01-01
影响因子：
2
通讯作者：
Heller, William T.
中科院分区：
文献类型：
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作者：
Motokawa, Ryuhei;Endo, Hitoshi;Heller, William T.
我们对含有由 Zr(NO3)(4) 和磷酸三正丁酯组成的络合物的萃取有机相进行了中子偏振分析 (NPA)，这使得小角中子散射 (SANS) 的强度分布分解为相干和非相干散射分量。包含结构信息的相干散射强度和非相干散射在散射矢量 q 的较宽范围内竞争，特别是当 q 大于 q* 近似 1/R-g 时，其中 R-g 是散射体的回转半径。因此，当 R-g 很小时，例如上述提取的配位物种，准确确定非相干散射强度对于从 SANS 数据进行准确的结构分析非常重要。虽然 NPA 是评估非相干散射分量以准确确定 SANS 中相干散射的最佳方法，但该方法在 SANS 数据分析中并不经常使用，因为它在技术上具有挑战性。在这项研究中，我们成功证明了使用 NPA 进行非相干散射实验测定适用于包含相干散射强度较弱的小散射体的样品系统，例如双相溶剂萃取系统中的萃取复合物。
We performed neutron polarization analysis (NPA) of extracted organic phases containing complexes, comprised of Zr(NO3)(4) and tri-n-butyl phosphate, which enabled decomposition of the intensity distribution of small-angle neutron scattering (SANS) into the coherent and incoherent scattering components. The coherent scattering intensity, containing structural information, and the incoherent scattering compete over a wide range of magnitude of scattering vector, q, specifically when q is larger than q* approximate to 1/R-g, where R-g is the radius of gyration of scatterer. Therefore, it is important to determine the incoherent scattering intensity exactly to perform an accurate structural analysis from SANS data when R-g is small, such as the aforementioned extracted coordination species. Although NPA is the best method for evaluating the incoherent scattering component for accurately determining the coherent scattering in SANS, this method is not used frequently in SANS data analysis because it is technically challenging. In this study, we successfully demonstrated that experimental determination of the incoherent scattering using NPA is suitable for sample systems containing a small scatterer with a weak coherent scattering intensity, such as extracted complexes in biphasic solvent extraction systems.