异质材料中的磁共振弛豫类似于一阶化学反应

IF 2.7 3区 工程技术 Q3 ENGINEERING, CHEMICAL Transport in Porous Media Pub Date : 2024-04-16 DOI:10.1007/s11242-024-02075-y
Armin Afrough
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引用次数: 0

摘要

生物组织、药片、木材、多孔岩石、催化反应器、混凝土和泡沫都是异质系统的例子,它们可能包含一个或多个流体相。此类系统中的流体携带化学物质,这些化学物质可能在流体的主体(即均相反应)或流体/流体或流体/固体界面(即异相反应)参与化学反应。磁共振弛豫测量的是这些流体中化学物质的 1H 核磁化在静态磁场中恢复到平衡状态的过程。尽管反应扩散与弛豫扩散在异质系统中存在明显差异,但两者之间的相似性却非常显著。这项研究将磁共振弛豫扩散与稀溶液中基本单元反应({\text{A}}\to {\text{B}}\)的化学反应扩散紧密地联系在一起--两者都发生在异质系统中。在表征其相关行为的无量纲数之间存在着惊人的相似性:反应的第二类达姆克勒数({{text{Da}}}^{text{II}}})和弛豫的布朗斯泰因-塔尔数({{text{BT}}}_{i}})。异质系统中反应和磁共振弛豫扩散之间的类比这一新观点鼓励人们利用反应和弛豫过程之间的相似性,对化学物种和反应的动态进行非侵入式研究。其中一个在化学工程中非常重要的例子是填料床中的固液反应。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

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Magnetic Resonance Relaxation in Heterogeneous Materials is Analogous to First-Order Chemical Reaction

Biological tissue, pharmaceutical tablets, wood, porous rocks, catalytic reactors, concrete, and foams are examples of heterogeneous systems that may contain one or several fluid phases. Fluids in such systems carry chemical species that may participate in chemical reactions in the bulk of a fluid, as homogeneous reactions, or at the fluid/fluid or fluid/solid interfaces, as heterogeneous reactions. Magnetic resonance relaxation measures the return of 1H nuclear magnetization in chemical species of these fluids to an equilibrium state in a static magnetic field. Despite the perceived difference between reaction–diffusion and relaxation–diffusion in heterogeneous systems, similarities between the two are remarkable. This work draws a close parallel between magnetic resonance relaxation–diffusion and chemical reaction–diffusion for elementary unitary reaction \({\text{A}}\to {\text{B}}\) in a dilute solution—both in heterogeneous systems. A striking similarity between the dimensionless numbers that characterize their relevant behavior is observed: the Damköhler number of the second kind \({{\text{Da}}}^{{\text{II}}}\) for reaction and the Brownstein–Tarr number \({{\text{BT}}}_{i}\) for relaxation. The new vision of analogy between reaction- and magnetic resonance relaxation–diffusion in heterogeneous systems encourages the exploitation of similarities between reaction and relaxation processes to noninvasively investigate the dynamics of chemical species and reactions. One such example of importance in chemical engineering is provided for solid–fluid reaction in packed beds.

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来源期刊
Transport in Porous Media
Transport in Porous Media 工程技术-工程:化工
CiteScore
5.30
自引率
7.40%
发文量
155
审稿时长
4.2 months
期刊介绍: -Publishes original research on physical, chemical, and biological aspects of transport in porous media- Papers on porous media research may originate in various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering)- Emphasizes theory, (numerical) modelling, laboratory work, and non-routine applications- Publishes work of a fundamental nature, of interest to a wide readership, that provides novel insight into porous media processes- Expanded in 2007 from 12 to 15 issues per year. Transport in Porous Media publishes original research on physical and chemical aspects of transport phenomena in rigid and deformable porous media. These phenomena, occurring in single and multiphase flow in porous domains, can be governed by extensive quantities such as mass of a fluid phase, mass of component of a phase, momentum, or energy. Moreover, porous medium deformations can be induced by the transport phenomena, by chemical and electro-chemical activities such as swelling, or by external loading through forces and displacements. These porous media phenomena may be studied by researchers from various areas of physics, chemistry, biology, natural or materials science, and engineering (chemical, civil, agricultural, petroleum, environmental, electrical, and mechanical engineering).
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