Flow-enhanced molecular reorientations and interfacial slip probed by field-cycling NMR relaxometry in microscopic pores

被引：6
|
作者：
Mattea, C [1 ]
Kimmich, R [1 ]
机构：
[1] Univ Ulm, Sekt Kernresonanzspektroskopie, D-89069 Ulm, Germany
来源：
PHYSICAL REVIEW LETTERS | 2005年 / 94卷 / 02期
关键词：
D O I：
10.1103/PhysRevLett.94.024502
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
It is shown that hydrodynamic flow has an effect on spin-lattice relaxation in water filled into a porous monolithic silica material. This is a rotational analogue of translational hydrodynamic (or Taylor-Aris) dispersion arising from incoherent Brownian motion in combination with coherent flow. The effect is demonstrated with the aid of field-cycling NMR relaxometry and confirmed by theoretical considerations. The results directly verify bulk mediated surface diffusion and reveal interfacial slip at fluid-solid interfaces.
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页数：4
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