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首页> 外文期刊>Physica, B. Condensed Matter >Water dynamics in ionic magnetic colloids studied by H-1 nuclear magnetic resonance
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Water dynamics in ionic magnetic colloids studied by H-1 nuclear magnetic resonance

机译：H-1核磁共振研究离子磁性胶体中的水动力学

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In a previous nuclear magnetic resonance (NMR) study we observed that the NMR spectra of water in both surfacted and ionic ferrofluids are asymmetric and several orders of magnitude wider than the one of pure water. It has been proposed that this effect is produced by extremely strong magnetic field gradients in the intergrain volume and/or by surface interactions between the carrier liquid molecules and the grains surface. In the case of aqueous ionic ferrofluids the latter possibility should be interpreted as electric interactions between water (polar) molecules and the charges in the grain surface. In this work we study a series of ionic and surfacted ferrofluids prepared at different magnetic grain concentrations and sizes, and with different surface charge densities. Our experiments clearly show that the sign and the density of the electric charge on the magnetic grains have no influence on NMR spectra. On the other hand, spectral widths increase with the magnetic grain concentration. (C) 2002 Elsevier Science B.V. All rights reserved. [References: 11]
机译：在先前的核磁共振（NMR）研究中，我们观察到表面和离子铁磁流体中水的NMR谱都是不对称的，并且比纯净水的NMR谱宽几个数量级。已经提出，这种效果是通过晶粒间体积中的极强磁场梯度和/或通过载液分子与晶粒表面之间的表面相互作用而产生的。在水性离子铁磁流体的情况下，后一种可能性应解释为水（极性）分子与晶粒表面电荷之间的电相互作用。在这项工作中，我们研究了在不同的磁性颗粒浓度和尺寸以及不同的表面电荷密度下制备的一系列离子和表面铁磁流体。我们的实验清楚地表明，磁性颗粒上电荷的符号和密度对NMR光谱没有影响。另一方面，光谱宽度随磁性颗粒浓度而增加。 （C）2002 Elsevier Science B.V.保留所有权利。 [参考：11]

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