Neutron Compton scattering investigation of sodium hydride: from bulk material to encapsulated nanoparticulates in amorphous silica gel.
Neutron Compton scattering investigation of sodium hydride: from bulk material to encapsulated nanoparticulates in amorphous silica gel.
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氢化钠的中子康普顿散射研究：从散装材料到无定形硅胶中封装的纳米颗粒。
DOI：
10.1063/1.3561493
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发表时间：
2011
期刊：
影响因子：
--
通讯作者：
P. Edwards
中科院分区：
文献类型：
--
作者：
A. Seel;A. Sartbaeva;J. Mayers;A. Ramirez‐Cuesta;P. Edwards
在这项研究中，我们利用中子康普顿散射（NCS），以确定在NaH的核动量分布的差异，无论是作为散装材料和封装为纳米级颗粒（直径从20到50纳米）内的无定形硅胶基质（SiGNaH）。此外，还研究了分散在这种基质中的元素Na（SiGNa）。数据处理和拟合的实验光谱产生比较的核康普顿配置文件和径向动量分布的质子在散装NaH和纳米SiGNaH，与所得的质子动能与以前的非弹性中子散装NaH的研究。轻微的差异，质子径向动量分布散装和纳米系统的见证和讨论。化学计量固定的技术被施加到每个系统的背散射光谱，以检查在钠剖面宽度的变化，和NCS被证明是敏感的化学环境的变化，这个较重的核。凝胶样品中的Si和O分布宽度的检查也支持这种方法。
In this study we utilize neutron Compton scattering (NCS) to determine differences in nuclear momentum distributions in NaH, both as bulk material and encapsulated as nanoscale particles (from 20 to 50 nm in diameter) within an amorphous silica-gel matrix (SiGNaH). In addition, elemental Na dispersed in such a matrix is also studied (SiGNa). Data treatment and fitting of experimental spectra yields comparison of the nuclear Compton profiles and radial momentum distributions for the proton in both bulk NaH and nanoscale SiGNaH, with resultant proton kinetic energies being in agreement with previous inelastic neutron studies of bulk NaH. Slight differences in proton radial momentum distributions for bulk and nanoscale systems are witnessed and discussed. The technique of stoichiometric-fixing is applied to the backscattering spectra of each system in order to examine changes in the Na profile width, and NCS is shown to be sensitive to the chemical environment change of this heavier nucleus. Examination of the Si and O profile widths in the gel samples also supports this method.