Mass Transport of Volatile Molecules in Porous Materials: Evaporation–Condensation Phenomena Described by NMR Diffusometry
Mass Transport of Volatile Molecules in Porous Materials: Evaporation–Condensation Phenomena Described by NMR Diffusometry
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多孔材料中挥发性分子的传质：NMR 扩散测量法描述的蒸发-冷凝现象
DOI：
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发表时间：
2011
期刊：
影响因子：
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通讯作者：
S. Caldarelli
中科院分区：
文献类型：
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作者：
C. Carrara;G. Pagés;C. Delaurent;S. Viel;S. Caldarelli
采用脉冲场梯度（PFG）高分辨魔角自旋（HRMAS）核磁共振技术，通过测量一系列不同孔隙填充率的样品中的分子迁移率，研究了苯在色谱级多孔硅胶（孔径10 nm，球径5 μm）中的迁移机理.苯，纯的或溶解在氯仿中的气相扩散的相关性，建立，它意味着通过蒸发-冷凝机制的二氧化硅颗粒之间的苯的迁移。
The transport mechanism of benzene in chromatographic-grade porous silica gel (10 nm pore size, 5 μm sphere diameter) was described by pulsed-field gradient (PFG) high-resolution magic-angle spinning (HRMAS) NMR by measuring the molecular mobility in a series of samples with variable filling levels of the void volume. The relevance of vapor-phase diffusion for benzene, pure or dissolved in chloroform, was established, and it implies migration of benzene between silica particles through an evaporation–condensation mechanism.