NMR relaxation parameters from molecular simulations of hydrated inorganic nanopores

NMR relaxation parameters from molecular simulations of hydrated inorganic nanopores
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水合无机纳米孔分子模拟的 NMR 弛豫参数

DOI:
10.1002/qua.24708
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发表时间:
2014
影响因子:
2.2
通讯作者:
Bhatt J
Bhatt J
中科院分区:
化学3区
文献类型:
--
作者:
Bhatt J

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核磁共振弛豫测量是表征纳米孔到微孔介质中流体扩散运动的一种有效技术。分子模拟可以用偶极自旋-自旋相关函数来预测核磁共振弛豫参数。在本文中,水扩散的分子动力学模拟异常11 Å托贝莫来石,由三个狭缝孔和一个凝胶孔的宽度~ 1.0 nm,已经进行了。给出了水的二维和准二维平移和旋转对应的自旋-自旋相关函数分量。研究发现,裂隙孔隙中的运动是高度相关的,导致弛豫时间明显短于散装水。与凝胶孔或狭缝孔的相关性相比,狭缝孔与凝胶孔之间的相关性可以忽略不计。然而,这个相关函数可以用于定量水在狭缝孔隙内的扩散,这主要是通过随机位点跳变发生的。发现较强的表面相互作用导致较短的弛豫时间,而表面羟基有助于进一步降低水弛豫时间。©2014 Wiley期刊公司
Nuclear magnetic resonance (NMR) relaxometry is a powerful technique to characterize diffusive motion of fluids in nanoporous to microporous media. Molecular simulations can be used to predict NMR relaxation parameters using a dipolar spin–spin correlation function. In this article, molecular dynamics simulations of water diffusion in anomalous 11 Å tobermorite, consisting of three slit pores and one gel pore of width ∼1.0 nm, have been performed. The spin–spin correlation function components corresponding to both 2D and quasi‐2D translation and rotation of water are presented. It was found that motion in the slit pores is highly correlated, leading to a significantly shorter relaxation time compared to bulk water. The correlation between the slit pores and the gel pore was found to be negligible compared to that within either the gel pore or the slit pore exclusively. Nevertheless, this correlation function can be useful in quantifying water diffusion within the slit pores, which occurs primarily through stochastic site jumping. It was found that stronger surface interaction leads to lower relaxation times, while the hydroxyls on the surface help further lower the water relaxation times. © 2014 Wiley Periodicals, Inc.
DOI: 10.1088/0022-3719/14/4/018
发表时间: 1981-02
期刊: Journal of Physics C: Solid State Physics
影响因子: --
作者:
C. A. Sholl
通讯作者: C. A. Sholl
从头开始研究的正常 11 Å 雪硅石夹层结构
DOI: --
发表时间: 2009
期刊:
影响因子: --
作者:
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通讯作者: S. Churakov
通过固体中的平移扩散实现核自旋弛豫
DOI: --
发表时间: 1974
期刊:
影响因子: --
作者:
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通讯作者: C. A. Sholl
固体中平移扩散的核自旋弛豫:X.简单跳跃模型的蒙特卡罗计算
DOI: --
发表时间: 1986
期刊:
影响因子: --
作者:
D. Faux;D. Ross;C. A. Sholl
通讯作者: C. A. Sholl
水中的弛豫过程。质子自旋晶格弛豫时间的研究。
DOI: --
发表时间: 1973
期刊:
影响因子: --
作者:
J. Hindman;A. Svirmickas;M. Wood
通讯作者: M. Wood