Binary fluids in mesoporous materials: Phase separation studied by NMR relaxation and diffusion
作者机构：Technische Physik Ⅱ/PolymerphysikTechnische Universitat IlmenauD-98684IlmenauGermany
出 版 物：《Magnetic Resonance Letters》 (磁共振快报（英文）)
年 卷 期：2023年第3卷第2期
页 面：108-117,I0003页
核心收录：
学科分类：08[工学] 080502[工学-材料学] 0805[工学-材料科学与工程（可授工学、理学学位）]
主 题：NMR relaxation Fast field cycling Porous media Binary fluids Phase separation
摘 要：Relaxation and diffusion measurements were carried out on single and binary liquids filling the pore space of controlled porous glass Vycor with an average pore size of about 4 *** dispersion of the longitudinal relaxation time Tr is discussed as a means to identify liquid-surface interaction based on existing models developed for metal-free glass *** addition,the change of T1 and T2 with respect to their bulk values is discussed,in particular T2 serves as a probe for the strength of molecular *** the native glass surface is polar and contains a large amount of hydroxyl groups,a pronounced interaction of polar and protic adsorbate liquids is expected;however,the T dispersion,and the corresponding reduction of T2,are also observed for non-polar liquids such as alkanes and *** liquids are employed for simplifying data analysis in binary systems,but also for separating the respective contributions of intra-and intermolecular interactions to the overall relaxation *** the lack of paramagnetic impurities in the glass material,H and 2H relaxation dispersions of equivalent molecules are frequently found to differ from each other,suggesting intermolecular relaxation mechanisms for the H *** variation of the T dispersion when comparing single and binary systems gives clear evidence for the preferential adsorption of one of the two liquids,suggesting complete phase separation in several *** of the apparent tortuosity by self-diffusion experiments supports the concept of a local variation of sample composition within the porespace.
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