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Correlating Surface Chemistry to Surface Relaxivity via TD-NMR Studies of Polymer Particle Suspensions
Suekuni, Murilo T. Allgeier, Alan M.
Suekuni, Murilo T.
Allgeier, Alan M.
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Abstract
This study elucidates the impact of surface chemistry on solvent spin relaxation rates via time-domain nuclear magnetic resonance (TD-NMR). Suspensions of polymer particles of known surface chemistry were prepared in water and n-decane. Trends in solvent transverse relaxation rates demonstrated that surface polar functional groups induce stronger interactions with water with the opposite effect for n-decane. NMR surface relaxivities (ρ2) calculated for the solid–fluid pairs ranged from 0.4 to 8.0 μm s–1 and 0.3 to 5.4 μm s–1 for water and n-decane, respectively. The values of ρ2 for water displayed an inverse relationship to contact angle measurements on surfaces of similar composition, supporting the correlation of the TD-NMR output with polymer wettability. Surface composition, i.e., H/C ratios and heteroatom content, mainly contributed to the observed surface relaxivities compared to polymer % crystallinity and mean particle sizes via multiple linear regression. Ultimately, these findings emphasize the significance of surface chemistry in TD-NMR measurements and provide a quantitative foundation for future research involving TD-NMR investigations of wetted surface area and fluid-surface interactions. A comprehensive understanding of the factors influencing solvent relaxation in porous media can aid the optimization of industrial processes and the design of materials with enhanced performance.
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Date
2023-10-09
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ACS Publications
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au3c00384.pdf
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Keywords
TD-NMR, Polymer science, Surface–solvent interactions, Adsorption energy, Particle suspensions, Surface relaxivity, Solvent relaxation
Citation
Suekuni MT, Allgeier AM. Correlating Surface Chemistry to Surface Relaxivity via TD-NMR Studies of Polymer Particle Suspensions. JACS Au. 2023 Oct 9;3(10):2826-2834. doi: 10.1021/jacsau.3c00384. PMID: 37885588; PMCID: PMC10598564