MRI of mass transport in porous media: Drying and sorption processes

Koptyug, Igor V.

doi:10.1016/j.pnmrs.2011.12.001

Cited by 65 publications

(20 citation statements)

References 591 publications

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“…To a lesser extent, Nuclear Magnetic Resonance (NMR) and Magnetic resonance Imaging (MRI) have been also employed to examine the drying phenomena. [15][16][17] These are mainly focused on inorganic rigid matrices such as sand or concrete. 11,[18][19][20] Surprisingly, there are no reports to our knowledge on the drying of stable porous polymeric materials, although they have found a wide spectrum of applications such as support for catalysts, 21 immobilization of enzymes, 22 HPLC columns, adsorbent devices and release of active substances, 23 among others.…”

Section: Introductionmentioning

confidence: 99%

Spatially Resolved Monitoring of Drying of Hierarchical Porous Organic Networks

et al. 2016

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Evaporation kinetics of water confined in hierarchal polymeric porous media is studied by low field nuclear magnetic resonance (NMR). Systems synthesized with various degrees of cross-linker density render networks with similar pore sizes but different response when soaked with water. Polymeric networks with low percentage of cross-linker can undergo swelling, which affects the porosity as well as the drying kinetics. The drying process is monitored macroscopically by single-sided NMR, with spatial resolution of 100 μm, while microscopic information is obtained by measurements of spin-spin relaxation times (T2). Transition from a funicular to a pendular regime, where hydraulic connectivity is lost and the capillary flow cannot compensate for the surface evaporation, can be observed from inspection of the water content in different sample layers. Relaxation measurements indicate that even when the larger pore structures are depleted of water, capillary flow occurs through smaller voids.

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Section: Introductionmentioning

confidence: 99%

Spatially Resolved Monitoring of Drying of Hierarchical Porous Organic Networks

et al. 2016

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“…Noninvasive means of diagnostics can facilitate understanding of battery failure modes (1)(2)(3)(4). MRI is a powerful tool for studying chemical, biological, and solid-state phenomena (5)(6)(7)(8). Recently, in situ MRI of model electrochemical devices shed light on underlying physical and mechanistic processes (9)(10)(11)(12)(13)(14)(15)(16).…”

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confidence: 99%

Distortion-free inside-out imaging for rapid diagnostics of rechargeable Li-ion cells

Romanenko

Jerschow

2019

Proc. Natl. Acad. Sci. U.S.A.

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Safety risks associated with modern high energy-dense rechargeable cells highlight the need for advanced battery screening technologies. A common rechargeable cell exposed to a uniform magnetic field creates a characteristic field perturbation due to the inherent magnetism of electrochemical materials. The perturbation pattern depends on the design, state of charge, accumulated mechanical defects, and manufacturing flaws of the device. The quantification of the induced magnetic field with MRI provides a basis for noninvasive battery diagnostics. MRI distortions and rapid signal decay are the main challenges associated with strongly magnetic components present in most commercial cells. These can be avoided by using Single-Point Ramped Imaging with T1 enhancement (SPRITE). The method is immune to image artifacts arising from strong background gradients and eddy currents. Due to its superior image quality, SPRITE is highly sensitive to defects and the state of charge distribution in commercial Li-ion cells.

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“…[15][16][17] The effect yields a decrease of the standard deviation of brightness in the sample image. It is generally accepted [1,2,[20][21][22] and was previously proven [14,[16][17][18] with neutron radiography that during the CRP the saturation with water is uniform across the sample. With decreasing water content, the scattered neutron component becomes less important and in effect, at the end of the first drying period, stronger diversification in the gray level distribution is produced, yielding an initial increase observed in the standard deviation versus time plot.…”

Section: Image Analysismentioning

confidence: 99%

“…In recent years, at least three imaging techniques have been employed in studies of drying processes. The overwhelming contribution has been provided by magnetic resonance imaging [1][2][3][4] and X-ray computed tomography. [1,[5][6][7][8] The wide application of both techniques stems from the rapid development and availability of medical scanners.…”

Section: Introductionmentioning

confidence: 99%

Neutron Radiography Applications in Studies of Drying of Capillary-Porous Systems

Fijał-Kirejczyk¹,

Milczarek²,

Radebe³

et al. 2013

Drying Technology

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The application of modern digital neutron radiography in the study of the drying process in porous media is demonstrated with two simple examples of cylindrical and rectangular samples made of different materials. The statistical method of image analysis is presented and the standard deviation of grey scale values (referred to brightness) is shown to be a useful measure of receding drying front emergence. The motion of the drying front was analyzed and found neither linear nor proportional to the square root of time and was delineated with nonlinear functions different for each sample shape.

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MRI of mass transport in porous media: Drying and sorption processes

Cited by 65 publications

References 591 publications

Spatially Resolved Monitoring of Drying of Hierarchical Porous Organic Networks

Spatially Resolved Monitoring of Drying of Hierarchical Porous Organic Networks

Distortion-free inside-out imaging for rapid diagnostics of rechargeable Li-ion cells

Neutron Radiography Applications in Studies of Drying of Capillary-Porous Systems

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