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Transport of water-glycerol mixtures in porous materials studied with NMR imaging

机译：水-甘油混合物在多孔材料中的传输通过NMR成像研究

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The penetration of water-glycerol mixtures in a porous material is studied by using NMR (Nuclear Magnetic Resonance) measurements in view of understanding and improving water based inks performance on paper. AI2O3 samples are used as well-defined model systems to quantify the penetration of each mixture component. We investigated the dependence of glycerol concentration in water on the penetration speed, and quantify to what extend the mixture separates in the porous material. We visualized water and glycerol as a function of time and link the behavior of this mixture to the rheological properties. Finally, we investigated the effect of pore size on the imbibition behavior. We found that water-glycerol mixtures penetrate the porous material as a single liquid in both 200 nm and 1100 nm porous AI2O3. Furthermore we showed that the imbibition process can be described by a modified version of Washburn's equation and that the behavior can be scaled with liquid and media parameters to result in one generic curve. This implies that the complex mixture behaves as a homogeneous liquid and the sorption behavior is determined by the average viscosity and surface tension of the mixture.
机译：考虑到理解和改善纸上的水基油墨性能，通过使用NMR（核磁共振）测量研究了水-甘油混合物在多孔材料中的渗透性。 AI2O3样品用作定义明确的模型系统以量化每种混合物组分的渗透。我们研究了水中甘油浓度对渗透速度的依赖性，并量化了混合物在多孔材料中分离的程度。我们将水和甘油可视化为时间的函数，并将这种混合物的行为与流变特性联系起来。最后，我们研究了孔径对吸水行为的影响。我们发现，水-甘油混合物在200 nm和1100 nm多孔AI2O3中均作为单一液体渗透多孔材料。此外，我们表明，可以通过Washburn方程的修改版本来描述吸水过程，并且可以用液体和介质参数对行为进行缩放，以得出一条通用曲线。这意味着复杂的混合物表现为均匀的液体，而吸附行为则取决于混合物的平均粘度和表面张力。

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