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Article

Solvent Relaxation NMR as a Tool to Study Particle Dispersions in Non-Aqueous Systems

by
Zahra Alaei
1,
Beatrice Cattoz
2,
Peter John Dowding
2 and
Peter Charles Griffiths
1,*
1
School of Science, Faculty of Engineering and Science, University of Greenwich, Chatham Maritime, Kent ME4 4TB, UK
2
Infineum International Ltd., Milton Hill Business and Technology Centre, Abingdon OX13 6BB, UK
*
Author to whom correspondence should be addressed.
Physchem 2022, 2(3), 224-234; https://doi.org/10.3390/physchem2030016
Submission received: 21 March 2022 / Revised: 18 May 2022 / Accepted: 12 July 2022 / Published: 15 July 2022
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Abstract

The determination of the NMR spin–spin relaxation rate of water in (purely) aqueous particulate dispersions has been shown to be a convenient and facile experimental approach to probing the composition of near particle surface structures. Here, a systematic study has been undertaken of both non-aqueous and mixed aqueous–non-aqueous solvent particulate dispersions to explore the universality of the solvent relaxation technique. As in the aqueous case, a linear relationship between the surface area present and the solvent relaxation rate is observed, confirming the rapid exchange of the solvent molecules between the surface and the bulk and thereby illustrating the viability of the experimental methodology to study such systems. Crucially, the surface enhancement effect was considerably weaker in non-aqueous systems compared with aqueous dispersions and reflects a potential limitation of the wider deployment of this experimental methodology.
Keywords: NMR spin–spin relaxation time; specific relaxation rate; average relaxation rate; solvent composition; solvent polarity NMR spin–spin relaxation time; specific relaxation rate; average relaxation rate; solvent composition; solvent polarity

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MDPI and ACS Style

Alaei, Z.; Cattoz, B.; Dowding, P.J.; Griffiths, P.C. Solvent Relaxation NMR as a Tool to Study Particle Dispersions in Non-Aqueous Systems. Physchem 2022, 2, 224-234. https://doi.org/10.3390/physchem2030016

AMA Style

Alaei Z, Cattoz B, Dowding PJ, Griffiths PC. Solvent Relaxation NMR as a Tool to Study Particle Dispersions in Non-Aqueous Systems. Physchem. 2022; 2(3):224-234. https://doi.org/10.3390/physchem2030016

Chicago/Turabian Style

Alaei, Zahra, Beatrice Cattoz, Peter John Dowding, and Peter Charles Griffiths. 2022. "Solvent Relaxation NMR as a Tool to Study Particle Dispersions in Non-Aqueous Systems" Physchem 2, no. 3: 224-234. https://doi.org/10.3390/physchem2030016

APA Style

Alaei, Z., Cattoz, B., Dowding, P. J., & Griffiths, P. C. (2022). Solvent Relaxation NMR as a Tool to Study Particle Dispersions in Non-Aqueous Systems. Physchem, 2(3), 224-234. https://doi.org/10.3390/physchem2030016

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