NMR Study of the Water Dynamics in Aqueous Colloidal Magnetic Fluids at Different pH's and Grains Concentrations

C. E. Gonzalez; D. J. Pusiol; A. M. Figueiredo Neto; M. Ramia; A. Bourdon; A. Bee

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NMR Study of the Water Dynamics in Aqueous Colloidal Magnetic Fluids at Different pH's and Grains Concentrations

机译：不同pH和颗粒浓度下胶态磁流体水动力学的NMR研究

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In a previous NMR study [Gonzalez, C.E.; et al. J. Chem. Phys. 1998, 109, 4670] we observed that the ~1H and ~2H spectra of both surfacted and ionic ferrofluids are broad and asymmetric. In ionic ferrofluids, this effect could be due to (i) electric interactions between the electrically charged magnetic grains and the electric dipole moments of water molecules and/or (ii) the interaction between water molecules and the distribution of magnetic field gradients in the intergrain volume. In this work we study a series of ionic ferrofluids prepared at different magnetic grains concentrations and with different surface charge densities. Our experiments clearly show that the sign and the density of the electric charge of the magnetic grains have no influence on the NMR spectra. On the other hand, spectral widths in crease with the magnetic grains concentration, all the samples being far from the motional narrowing regime.

机译：在先前的NMR研究中[Gonzalez，C.E .;等。 J.化学物理1998，109，4670]，我们观察到表面和离子铁磁流体的〜1H和〜2H谱都是宽且不对称的。在离子铁磁流体中，这种影响可能是由于（i）带电的磁性粒子与水分子的电偶极矩之间的电相互作用和/或（ii）水分子之间的相互作用以及晶间磁场梯度分布卷。在这项工作中，我们研究了一系列在不同磁性颗粒浓度和不同表面电荷密度下制备的离子铁磁流体。我们的实验清楚地表明，磁性颗粒的符号和电荷密度对NMR光谱没有影响。另一方面，光谱宽度随着磁性颗粒浓度的增加而增加，所有样本都远离运动变窄区域。

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《The journal of physical chemistry, B. Condensed matter, materials, surfaces, interfaces & biophysical》 |2003年第2期|共5页
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C. E. Gonzalez; D. J. Pusiol; A. M. Figueiredo Neto; M. Ramia; A. Bourdon; A. Bee;
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中图分类物理化学（理论化学）、化学物理学;
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NMR Study of the Water Dynamics in Aqueous Colloidal Magnetic Fluids at Different pH's and Grains Concentrations

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