Correlating Surface Chemistry to Surface Relaxivity Via TD-NMR Studies of Polymer Particle Suspensions

Overview

Journal JACS Au

Publisher American Chemical Society

Specialty Chemistry

Date 2023 Oct 27

PMID 37885588

Authors

Murilo T Suekuni

Alan M Allgeier

Affiliations

Soon will be listed here.

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 -decane. Trends in solvent transverse relaxation rates demonstrated that surface polar functional groups induce stronger interactions with water with the opposite effect for -decane. NMR surface relaxivities (ρ) calculated for the solid-fluid pairs ranged from 0.4 to 8.0 μm s and 0.3 to 5.4 μm s for water and -decane, respectively. The values of ρ 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.

Citing Articles

Time-Domain NMR: Generating Unique Insights into the Characterization of Heterogeneous Catalysis in Liquid Phase.

Suekuni M, DAgostino C, Allgeier A ACS Catal. 2025; 15(3):2063-2081.

PMID: 39944760 PMC: 11811928. DOI: 10.1021/acscatal.4c04789.

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