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NMR relaxometry for molecular structure analysis of stimuli-responsive lyogels in varied solvent polarities
Publikationstyp
Conference Poster
Date Issued
2025-03
Sprache
English
Author(s)
Citation
Quantitative NMR Methods for Reaction and Process Monitoring, NMRPM 2025
Contribution to Conference
Stimuli-responsive lyogels undergo significant macroscopic changes under external stimuli, making them ideal for applications like flow control valves or catalyst carriers in SMART reactors [1]. However, effective integration requires understanding their pore structure and diffusion behavior under various conditions, as this influences functionality. While several methods assess macroscopic swelling/shrinking, few provide microstructural insights into their swelling and shrinking state.
Nuclear Magnetic Resonance (NMR) is a suitable tool for the study of solvent dynamics inside macro, meso, and nanopores, through changes in their relaxation times and self-diffusion coefficients. Although 1H NMR relaxometry has been widely used to investigate the in-situ swelling behavior of hydrogels, microgels, and different polymer matrices [2, 3], there is still limited research on the dynamic swelling/shrinking behavior of lyogels in pure and/or mixtures of solvents of varying polarity.
In this work, we use 1H NMR relaxometry measurements (Spinsolve 60, Magritek) to investigate the microstructural changes of lyogels under different stimuli. By analyzing relaxation dynamics, we examine how molecular interactions and structural modifications respond to solvents of different polarity. These insights enhance our understanding of the physicochemical behavior of organic systems and their interactions with diverse environments.
References:
[1] K. M. Eckert, et al., Fluid Phase Equilibria 586 (2024) 114182.
[2] J. M. Giussi, et al., Soft Matter 11.45 (2015) 8879-8886.
[3] D. M. Gruber, M. S. Ferris, G. Zabow, Polymer 281 (2023) 126108.
Nuclear Magnetic Resonance (NMR) is a suitable tool for the study of solvent dynamics inside macro, meso, and nanopores, through changes in their relaxation times and self-diffusion coefficients. Although 1H NMR relaxometry has been widely used to investigate the in-situ swelling behavior of hydrogels, microgels, and different polymer matrices [2, 3], there is still limited research on the dynamic swelling/shrinking behavior of lyogels in pure and/or mixtures of solvents of varying polarity.
In this work, we use 1H NMR relaxometry measurements (Spinsolve 60, Magritek) to investigate the microstructural changes of lyogels under different stimuli. By analyzing relaxation dynamics, we examine how molecular interactions and structural modifications respond to solvents of different polarity. These insights enhance our understanding of the physicochemical behavior of organic systems and their interactions with diverse environments.
References:
[1] K. M. Eckert, et al., Fluid Phase Equilibria 586 (2024) 114182.
[2] J. M. Giussi, et al., Soft Matter 11.45 (2015) 8879-8886.
[3] D. M. Gruber, M. S. Ferris, G. Zabow, Polymer 281 (2023) 126108.
DDC Class
620: Engineering