Probing Selective Adsorption in Cationic-Polymer Induced Aggregation of Binary Anionic Particulate Dispersions Using Solvent Relaxation NMR

NMR solvent relaxation has been used to characterize the surfaces present in binary anionic particle dispersions, before and after exposure to a cationic polymer. In the polymer-free case, it is shown that the measured specific relaxation rate of the solvent is a population-weighted average of all s...

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Bibliographic Details
Published in:Polymers 2022-05, Vol.14 (9), p.1875
Main Authors: Abdullahi, Wasiu, Crossman, Martin, Griffiths, Peter Charles
Format: Article
Language:English
Subjects:
Addition polymerization
Adsorbents
Adsorption
Cationic polymerization
Dispersions
Hydroxyethyl celluloses
Latex
NMR
Nuclear magnetic resonance
Phase separation
Polymers
Selective adsorption
Solvents
Surface chemistry
Surfactants
Titanium dioxide
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Summary:NMR solvent relaxation has been used to characterize the surfaces present in binary anionic particle dispersions, before and after exposure to a cationic polymer. In the polymer-free case, it is shown that the measured specific relaxation rate of the solvent is a population-weighted average of all surfaces present, enabling preferential adsorption to be explored. The addition of the oppositely charged polymer led to phase separation, which was accelerated by gentle centrifugation. The measured relaxation rates and the equilibrium particle concentrations indicate that the cationic hydroxyethylcellulose polymer (HEC LR) exhibited no significant preference for either latex or laponite in binary blends with silica, but a strong preference for TiO . This study illustrates the versatility of solvent relaxation to probe surface area, surface type and dispersion composition in complex formulations.
ISSN:2073-4360
2073-4360
DOI:10.3390/polym14091875