Confinement Effects on the Benzene Orientational Structure.

Confinement Effects on the Benzene Orientational Structure.
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DOI:
10.1002/anie.201713115
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发表时间:
2018-04-16
期刊:
Angewandte Chemie (International ed. in English)
影响因子:
--
通讯作者:
Hardacre C
Hardacre C
中科院分区:
其他
文献类型:
--
作者:
Falkowska M;Bowron DT;Manyar H;Youngs TGA;Hardacre C

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在约束下的液体表现出不同的性质相比,其相应的体相,例如,可溶解性,相变和扩散。其根本原因是分子的局部有序性,这通常只使用纯模拟方法进行研究。在这里,我们推导出实验结构的苯限制在MCM-41使用总中子散射测量。这项研究揭示了分子在孔中的分层,并且可以区分半径为18 μ m的孔的四个同心圆柱壳。 当与本体液体的结构相比时,液体的纳米级限制对分子之间观察到的空间和取向相关性具有重大影响。这些差异对于平行构型的分子最为明显,这表明受限液体和本体液体之间的化学反应性存在差异。
Liquids under confinement exhibit different properties compared with their corresponding bulk phases, for example, miscibility, phase transitions, and diffusion. The underlying cause is the local ordering of molecules, which is usually only studied using pure simulation methods. Herein, we derive experimentally the structure of benzene confined in MCM‐41 using total neutron scattering measurements. The study reveals a layering of molecules across a pore, and four concentric cylindrical shells can be distinguished for a pore with the radius of 18 Å. The nanoscale confinement of the liquid has a major effect on the spatial and orientational correlations observed between the molecules, when compared with the structure of the bulk liquid. These differences are most marked for molecules in parallel configurations, and this suggests differences in chemical reactivity between the confined and bulk liquids.
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