Spin Diffusion and Spin–Lattice Relaxation in the Zeeman and Dipolar Systems

Furman, G. B.; Goren, S. D.; Meerovich, V.

doi:10.1007/s00723-021-01349-8

Cited by 6 publications

(3 citation statements)

References 30 publications

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“…This exchange was modelled with two coupled reservoirs representing the core and bulk spins, respectively, where the diffusion barrier limits the exchange of Zeeman energy between these reservoirs. 29 The energy flow across the barrier is frequently attributed to dipolar interactions, [30][31][32][33] and it is conceivable that the coupling of the two reservoirs is field-dependent, since more Zeeman energy has to be transferred across the barrier at higher fields. However, for 13 C no experimental studies of this coupling have have been presented to date.…”

Section: Discussionmentioning

confidence: 99%

Radical-induced hetero-nuclear mixing and low-field ¹³C relaxation in solid pyruvic acid

Kouřilová

Jurkutat

Peat

et al. 2022

Phys. Chem. Chem. Phys.

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Section: Discussionmentioning

confidence: 99%

Radical-induced hetero-nuclear mixing and low-field ¹³C relaxation in solid pyruvic acid

Kouřilová

Jurkutat

Peat

et al. 2022

Phys. Chem. Chem. Phys.

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“…The energy flow across the barrier is frequently attributed to dipolar interactions 34 , and it is conceivable that the coupling of the two reservoirs is field-dependent, since more Zeeman energy has to be transferred across the barrier at higher fields. As detailed in the Supplementary Material, the relaxation model ( 3)-( 5) may be extended with a second carbon reservoir and a fielddependent carbon core-bulk time constant of 33 s/T.…”

Section: Relaxation Model and Datamentioning

confidence: 99%

Radical-induced Hetero-Nuclear Mixing and Low-field $^{13}$C Relaxation in Solid Pyruvic Acid

Kouřilová¹,

Jurkutat²,

Peat³

et al. 2022

Preprint

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In dynamic nuclear polarization, polarization is transferred from electron to nuclear spins at low temperatures. So far, it is not possible to predict the relaxation of hyperpolarized solids, and applications are developed largely by trial and error. Here, we study the low-field nuclear spin relaxation in pyruvic acid, doped with trityl. We find that, at low fields, the relaxation time constants for both 13 C and 1 H scale linearly with the applied field. We model the data using a thermodynamic approach, in which heat is transferred via triple-spin-flips involving two electron spins and one nuclear spin. The triple-spin-flip rate is calculated from first principles using a formalism developed by Wenckebach. The heat capacity of the Non-Zeeman reservoir is determined from the 1 H relaxation data at intermediate fields, which leads to a parameter-free, yet nearly quantitative description of the observed 1 H relaxation rates from 5 mT to 2 T. The observed 13 C relaxation is consistent with the formalism, provided that the direct energy exchange between the 1 H and 13 C reservoirs, and the diffusion barrier are accounted for at low and high fields, respectively. The formalism also describes the observed electron-mediated 1 H-13 C thermal mixing.

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“…Finally, there have been substantial efforts to perform MRI with hyperpolarized 29 Si nuclei in bulk Si NPs, [46] PSiNPs, [47] and Si microparticles [48] . Hyperpolarization is the process of increasing the polarization of nuclei beyond thermal equilibrium [49] . Thus, each SiNP has large magnetization that can be detected without the need for a high magnetic field, and the imaging can, in principle, be performed at a low field.…”

Section: Imaging Modelsmentioning

confidence: 99%

Recent Developments in Porous Silicon Nanovectors with Various Imaging Modalities in the Framework of Theranostics

et al. 2022

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The number of in vitro, ex vivo, and in vivo studies on porous silicon (PSi) nanoparticles for biomedical applications has increased extensively over the last decade. The focus of the reports has been on the carrier properties of PSi concerning the therapeutic aspect due to several beneficial nanovector characteristics including high payload capacity, biocompatibility, and versatile surface chemistry. Recently, increasing attention has been paid to the diagnostic aspects of PSi, which is typically attributed to the biotraceability of the nanovector. Also, PSi has been studied as a contrast agent. When both these aspects, therapy and diagnosis, are integrated into one nanovector, we can discuss a real nanotheranostics approach. Herein, we review the recent progress developing PSi for various imaging modalities, specifically focusing on optical imaging, magnetic resonance imaging, and nuclear medicine imaging. Furthermore, we summarized the knowledge gaps that must be covered before applying PSi in clinical imaging, highlighting future research trends.

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Spin Diffusion and Spin–Lattice Relaxation in the Zeeman and Dipolar Systems

Cited by 6 publications

References 30 publications

Radical-induced hetero-nuclear mixing and low-field ¹³C relaxation in solid pyruvic acid

Radical-induced hetero-nuclear mixing and low-field ¹³C relaxation in solid pyruvic acid

Radical-induced Hetero-Nuclear Mixing and Low-field $^{13}$C Relaxation in Solid Pyruvic Acid

Recent Developments in Porous Silicon Nanovectors with Various Imaging Modalities in the Framework of Theranostics

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Spin Diffusion and Spin–Lattice Relaxation in the Zeeman and Dipolar Systems

Cited by 6 publications

References 30 publications

Radical-induced hetero-nuclear mixing and low-field 13C relaxation in solid pyruvic acid

Radical-induced hetero-nuclear mixing and low-field 13C relaxation in solid pyruvic acid

Radical-induced Hetero-Nuclear Mixing and Low-field $^{13}$C Relaxation in Solid Pyruvic Acid

Recent Developments in Porous Silicon Nanovectors with Various Imaging Modalities in the Framework of Theranostics

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Product

Resources

About

Radical-induced hetero-nuclear mixing and low-field ¹³C relaxation in solid pyruvic acid

Radical-induced hetero-nuclear mixing and low-field ¹³C relaxation in solid pyruvic acid