Theory and Simulation Framework for the Relaxation of Nuclear Spin Order in Porous Media.

Theory and Simulation Framework for the Relaxation of Nuclear Spin Order in Porous Media.
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DOI:
10.1021/acs.jpcb.2c03575
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发表时间:
2022-09-01
影响因子:
3.3
通讯作者:
Pileio, Giuseppe
Pileio, Giuseppe
中科院分区:
化学3区
文献类型:
--
作者:
Cartlidge, Topaz A. A.;Robertson, Thomas B. R.;Utz, Marcel;Pileio, Giuseppe

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本文研究了液体渗透不规则固体结构中的核自旋弛豫理论。探讨了限制扩散和系统中磁化率不均匀分布所产生的退磁场的影响。提出了一个由布朗动力学、平均哈密顿理论和刘维尔空间自旋动力学组成的框架,用于模拟从实际样品的CT扫描获得的随机结构的3D模型中的核自旋弛豫。模拟结果与实验数据进行了比较。一个有效的近似内的解析解也报告。
The theory of nuclear spin relaxation in a liquid permeating a solid structure of irregular geometry is examined. The effects of restricted diffusion and the demagnetizing field generated by an inhomogeneous distribution of magnetic susceptibility in the system are explored. A framework comprising Brownian Dynamics, average Hamiltonian theory, and Liouville-space spin dynamics is proposed for simulating nuclear spin relaxation in 3D models of random structures obtained from CT scans of actual samples. Simulations results are compared with experimental data. An analytical solution valid within approximation is also reported.
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