biostudies-literatureSuekuni MTAmerican Chemical Society Petroleum Research Fund2826-2834https://www.ebi.ac.uk/biostudies/studies/S-EPMC10598564biostudies-literatureUnknown3(10)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 <i>n</i>-decane. Trends in solvent transverse relaxation rates demonstrated that surface polar functional groups induce stronger interactions with water with the opposite effect for <i>n</i>-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 <i>n</i>-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.JACS AuCorrelating Surface Chemistry to Surface Relaxivity via TD-NMR Studies of Polymer Particle Suspensions.PMC1059856461103-ND10Suekuni MTAllgeier AMfalseCorrelating Surface Chemistry to Surface Relaxivity via TD-NMR Studies of Polymer Particle Suspensions.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 <i>n</i>-decane. Trends in solvent transverse relaxation rates demonstrated that surface polar functional groups induce stronger interactions with water with the opposite effect for <i>n</i>-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 <i>n</i>-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.2023-01-01T00:00:00Z2023 Oct2026-06-02T05:10:39.88Z2026-04-14T03:13:19.072ZS-EPMC105985643788558810.1021/jacsau.3c00384