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97.2 MB
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Oct. 4, 2025, 9:42 a.m.
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(Last updated: Oct. 4, 2025, 9:43 a.m.)
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| Davoodi H. NMR micro-detectors tailored for multinuclear...electrochemistry 2021.pdf | 97.2 MB |
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| Uploaded by andryold1 | Size 97.2 MB | Health [ 19 /10 ] | Added 2025-10-04 |
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SOURCE: Davoodi H. NMR micro-detectors tailored for multinuclear...electrochemistry 2021
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MEDIAINFO
Textbook in PDF format Each individual isotope has a certain precessing frequency when exposed to an external static magnetic field. Nevertheless, the actual magnetic field, which each nucleus experiences, depends on its chemical and physical environment. Thus, under different environmental conditions, the precessing frequency of the nucleus is slightly different and it can be used to "spy" on the chemical and physical properties of the medium. Nuclear magnetic resonance (NMR) relies on the same principle to detect the precessing frequency, using a radiofrequency (RF) magnetic field interface. Since NMR technique suffers from low sensitivity, a good communication between the sensor (also known as the coil) and the nuclei, as well as efficient signal transfer between the sensor and the rest of signal processing systems, is of great importance. This thesis introduces and studies three novel solutions to improve NMR performance for different applications. One of NMR bottlenecks is the incompatibility of the technique with conductive elements inside the NMR detection region. Because of their shielding properties, conductive elements have a considerable impact on the magnetic field link between the NMR sensor and the sample. This issue influences a wide range of potentially interesting NMR applications, e.g., electrochemistry reactions, electrophoresis, and dielectrophoresis. As the first sub-topic of this thesis, different potential electrode designs are suggested in order to overcome this challenge. The theoretical and experimental evaluation of these potential solutions for an already-available Helmholtz coil offers two compatible electrode geometries, namely ultra-thin planar disk and side-wall electrodes. As the second focus point, this thesis tackles multinuclear detection challenges. In a standard NMR system, the detection bandwidth is traded in the favour of power transfer between the sensor and other hardware. However, this thesis considers the other way around. The penalty is evaluated and the sensor geometry is optimised to reduce the cost. It is shown that not only can the broadband detectors push the limits of the total number of detected nuclei but also these detectors exhibit an acceptable sensitivity. In parallel, a low-cost, broadband solution is introduced to enhance the sensitivity of standard NMR saddle coils when a small sample volume is available. This solution is based on a passive element which focuses the coil field of view at the sample volume. Additionally, this add-on flips the magnetic field so that it penetrates through the sample volume from a different direction. This achievement allows an efficient NMR experiment on the samples with hard geometries, e.g., thin films, thin slices, etc., or with conductive elements. In summary, this thesis offers three solutions tailored to their specific applications in order to enhance NMR performance. Furthermore, it has been shown how different figures of merit (excitation efficiency, RF field homogeneity, signal-to-noise ratio, and spectral resolution) can benefit from optimising the geometry of the system based on the requirements
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