Relaxometry refers to the study and/or measurement of relaxation variables in Nuclear Magnetic Resonance and Magnetic Resonance Imaging. Often referred to as Time-Domain NMR. In NMR, nuclear magnetic moments are used to measure specific physical and chemical properties of materials.

Relaxation of the nuclear spin system is crucial for all NMR applications. The relaxation rate depends strongly on the mobility (fluctuations, diffusion) of the microscopic environment and the strength of the applied magnetic field. As a rule of thumb, strong magnetic fields lead to increased sensitivity on fast dynamics while low fields lead to increased sensitivity on slow dynamics. Thus, the relaxation rate as a function of the magnetic field strength is a fingerprint of the microscopic dynamics. Key Materials science properties are often described in different fields using the terms mobility / dynamics / stiffness / viscosity / rigidity of the sample. These properties are usually dependent on atomic and molecular motion in the sample, which may be measured using time-domain NMR and fast field cycling relaxometry. [1] [2]

Equipment

Apparatus and technological support of the method is constantly developed. An NMR relaxometer is a device for relaxation time measuring. Laboratory NMR relaxometers for NMR signal registration are available in small sizes.[3] In NMR relaxometry (NMRR) only one specific NMRR parameter is measured, not the whole spectrum (which is not always needed). This helps to save time and resources and makes it possible to use an NMR relaxometer as a portable express analyzer in different branches of industry, science and technology, environmental protection, etc.[4] [5]

References

  1. ↑ Webber, J. Beau W. (2021). "A review of the use of simple time-domain NMR/MRI for material-science". SN Applied Sciences. 3 (10). doi:10.1007/s42452-021-04791-2. S2CID 244256779.
  2. ↑ "Fast Field Cycling Relaxometry". spinscope.com. 2012-04-22. Retrieved 2012-04-22.
  3. ↑ Davydov V.V.; Velichko E.N.; Karseev A.Yu. (2015). "Nuclear-magnetic mini-relaxometer for liquid and viscous media control". Scientific and Technical Journal of Information Technologies, Mechanics and Optics. 15 (1): 115–121. doi:10.17586/2226-1494-2015-15-1-115-121.
  4. ↑ Кашаев Р.С. (2011). "РАЗВИТИЕ НАУКИ И ОБРАЗОВАНИЯ НА ОСНОВЕ МЕЖДИСЦИПЛИНАРНОГО ПОДХОДА К ПРИМЕНЕНИЮ МЕТОДА ЯДЕРНОГО МАГНИТНОГО РЕЗОНАНСА (ЯМР)". Успехи современного естествознания (2): 82–87.
  5. ↑ Webber, John Beausire Wyatt; Demin, Pavel (2023). "Digitally Based Precision Time-Domain Spectrometer for NMR Relaxation and NMR Cryoporometry". Micro. 3 (2): 404–433. doi:10.3390/micro3020028.


This article is issued from Wikipedia. The text is licensed under Creative Commons - Attribution - Sharealike. Additional terms may apply for the media files.