接触 20 纳米 DyF3 纳米粒子的氦-3 核磁弛豫机制研究

IF 2 3区化学 Q3 BIOCHEMICAL RESEARCH METHODS

Journal of magnetic resonance Pub Date : 2024-04-22 DOI:10.1016/j.jmr.2024.107672

Adeliya Garaeva, Ekaterina Boltenkova, Kajum Safiullin , Irina Romanova, Egor Alakshin

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引用次数: 0

摘要

在温度为 1.5-4.2 K、磁场高达 505 mT 的条件下，利用脉冲核磁共振（NMR）研究了吸附和液态 3He 与 20 纳米 LaF3（99.67%）和 DyF3（0.33%）粉末混合物接触时的自旋动力学。实验中观察到了双分量核磁弛豫现象，并提出了理论弛豫模型。该模型考虑了位于吸附层和液体主体中的氦-3 核的磁化交换，可以解释这种现象。提出的弛豫模型可应用于受吸附层影响较大的其他系统。

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A study of helium-3 nuclear magnetic relaxation mechanism in contact with 20 nm DyF3 nanoparticles

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A study of helium-3 nuclear magnetic relaxation mechanism in contact with 20 nm DyF3 nanoparticles

The spin kinetics of adsorbed and liquid ³He in contact with a mixture of LaF₃ (99.67 %) and DyF₃ (0.33 %) 20 nm powders at temperatures of 1.5–4.2 K in magnetic fields up to 505 mT was studied by pulsed nuclear magnetic resonance (NMR). Two-component of nuclear magnetic relaxation was observed in the experiment and theoretical relaxation model was proposed. The possible explanation of this phenomena can be carried out by a model that consider the exchange of magnetization of helium-3 nuclei located in the adsorbed layer and in the bulk of the liquid. The proposed relaxation model can be applied to other systems with the strong influence of adsorbed layer.

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来源期刊

Journal of magnetic resonance 物理-光谱学

CiteScore

3.80

自引率

13.60%

发文量

150

审稿时长

69 days

期刊介绍： The Journal of Magnetic Resonance presents original technical and scientific papers in all aspects of magnetic resonance, including nuclear magnetic resonance spectroscopy (NMR) of solids and liquids, electron spin/paramagnetic resonance (EPR), in vivo magnetic resonance imaging (MRI) and spectroscopy (MRS), nuclear quadrupole resonance (NQR) and magnetic resonance phenomena at nearly zero fields or in combination with optics. The Journal''s main aims include deepening the physical principles underlying all these spectroscopies, publishing significant theoretical and experimental results leading to spectral and spatial progress in these areas, and opening new MR-based applications in chemistry, biology and medicine. The Journal also seeks descriptions of novel apparatuses, new experimental protocols, and new procedures of data analysis and interpretation - including computational and quantum-mechanical methods - capable of advancing MR spectroscopy and imaging.