Theses and Dissertations at Montana State University (MSU)
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Item Nuclear magnetic resonance studies to characterize phase transitions in porous systems(Montana State University - Bozeman, College of Engineering, 2018) Thrane, Linn Winsnes; Chairperson, Graduate Committee: Sarah L. Codd; Emily A. Berglund, James N. Wilking, David Vodak and Joseph D. Seymour were co-authors of the article, 'NMR relaxometry to characterize drug structural phase in a porous construct' in the journal 'Molecular pharmaceutics' which is contained within this thesis.; Sarah L. Codd and Joseph D. Seymour were co-authors of the article, 'Probing molecular dynamics during hydrate formation by high field NMR relaxometry and diffusometry' submitted to the journal 'Journal of magnetic resonance' which is contained within this thesis.; Ryanne L. Daily, Abby Thane, Catherine M. Kirkland, Evan R. McCarney, Robin Dykstra, Sarah L. Codd and Adrienne J. Phillips were co-authors of the article, 'Detecting microbially induced calcite precipitation in porous systems using low-field nuclear magnetic resonance relaxometry' submitted to the journal 'Environmental science & technology' which is contained within this thesis.Nuclear magnetic resonance (NMR) allows for in-situ non-invasive studies of a wide range of systems at microscopic time and length scales. NMR relaxometry and diffusometry techniques along with magnetic resonance imaging (MRI) are applied to explore and characterize various phase transitions in complex systems. NMR techniques are highly sensitive to the thermodynamic phase of the system as well as restrictions on molecular motion, and the ability to detect and monitor phase transitions non-invasively is of great interest for various industrial applications NMR frequency spectra and 1D T 2 relaxation measurements are used to characterize the presence of an amorphous drug and its liquid-solid phase transition. T 1- T 2 magnetic relaxation correlation experiments monitor the impact of long-time storage at high relative humidity on the drug in a porous silica tablet. The results indicate the ability of non-solid-state NMR to characterize crystalline and amorphous solid structural phases, and the potential for drug quality control by NMR methods. High resolution MRI along with T 1-T 2 magnetic relaxation correlation experiments and pulsed gradient stimulated echo (PGStE) NMR methods are demonstrated to characterize hydrate formation. MRI monitors the spatial heterogeneity of the system as well as local hydrate growth rates. Using T 1-T 2 correlation NMR and spectrally resolved diffusometry, the transition from mobile to restricted dynamics is observed simultaneously for both water and cyclopentane throughout the hydrate formation process. The combination of these MR techniques allows for exploration of the complex molecular dynamics involved in hydrate formation processes. Using a low-field NMR system, microbially induced calcite precipitation (MICP) processes in granular media are explored by means of 1D T 2 relaxation measurements. The 1D T 2 distributions allowed for in-situ monitoring of the mineral precipitation progress and indicates decrease in total pore volume and a significant change in the surface mineralogy of the granular media. The results confirm the potential for detailed characterization of MICP progression in engineering applications. Ultimately, NMR is demonstrated as an effective method for detecting, characterizing, and monitoring several distinct phase transitions at various time- and length-scales.Item Numerical analysis of bubble nucleation processes for first-order phase transitions within quantum fields(Montana State University - Bozeman, College of Letters & Science, 1991) Samuel, David AdrianItem Magnetic susceptibility measurements on the mixed system cobalt nickel trimethylammonium chloride : evidence for a spin reorientation transition(Montana State University - Bozeman, College of Letters & Science, 1998) Teske, Daniel RayItem Magnetic properties, phase transitions and critical behavior of quasi-two dimensional systems : studies on several layered copper compounds(Montana State University - Bozeman, College of Letters & Science, 1991) Zhou, PingItem Magnetic phase diagram and spin glass behavior of (CH₃₃H(Co�xNix)Cl₃2H₂O(Montana State University - Bozeman, College of Letters & Science, 1985) Raffaelle, David PaulItem Boson stars efficiently nucleate vacuum phase transitions(Montana State University - Bozeman, College of Letters & Science, 1997) Brueckner, Thomas JohnItem Phase transition studies of vinylidene fluoride copolymers with trifluororethylene and tetrafluoroethylene using brillouin scattering(Montana State University - Bozeman, College of Letters & Science, 1990) Liu, Chih-minItem Tricritical point in KH₂O₄(Montana State University - Bozeman, College of Letters & Science, 1977) Bacon, Charles RobertItem Pressure induced tricritical point in the ferroelectric phase transition of potassium dihydrogen phosphate(Montana State University - Bozeman, College of Letters & Science, 1976) Western, Arthur B.