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Effect of nanoparticle size on the near-surface pH-distribution in aqueous and carbonate buffered solutions
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Stepan, Thomas, Tété, Lisa, Laundry-Mottiar, Lila, Romanovskaia, Elena, Hedberg, Yolanda S., Danninger, Herbert and Auinger, Michael (2022) Effect of nanoparticle size on the near-surface pH-distribution in aqueous and carbonate buffered solutions. Electrochimica Acta, 409 . 139923. doi:10.1016/j.electacta.2022.139923 ISSN 0013-4686.
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WRAP-effect-nanoparticle-size-near-surface-pH-distribution-in aqueous-carbonate-buffered-solutions-2022.pdf - Published Version - Requires a PDF viewer. Available under License Creative Commons Attribution 4.0. Download (2562Kb) | Preview |
Official URL: http://dx.doi.org/10.1016/j.electacta.2022.139923
Abstract
An analytical solution for the effect of particle size on the current density and near-surface ion distribution around spherical nanoparticles is presented in this work. With the long-term aim to support predictions on corrosion reactions in the human body, the spherical diffusion equation was solved for a set of differential equations and algebraic relations for pure unbuffered and carbonate buffered solutions. It was shown that current densities increase significantly with a decrease in particle size, suggesting this will lead to an increased dissolution rate. Near-surface ion distributions show the formation of a steep pH-gradient near the nanoparticle surface (<6 m) which is further enhanced in the presence of a carbonate buffer (<2 m). Results suggest that nanoparticles in pure electrolytes not only dissolve faster than bigger particles but that local pH-gradients may influence interactions with the biological environment, which should be considered in future studies.
| Item Type: | Journal Article | ||||||||||||||||||
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| Subjects: | Q Science > QD Chemistry T Technology > TP Chemical technology |
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| Divisions: | Faculty of Science, Engineering and Medicine > Engineering > WMG (Formerly the Warwick Manufacturing Group) | ||||||||||||||||||
| Library of Congress Subject Headings (LCSH): | Nanoparticles, Hydrogen-ion concentration, Thermodynamics, Electrochemistry | ||||||||||||||||||
| Journal or Publication Title: | Electrochimica Acta | ||||||||||||||||||
| Publisher: | Pergamon | ||||||||||||||||||
| ISSN: | 0013-4686 | ||||||||||||||||||
| Official Date: | 20 March 2022 | ||||||||||||||||||
| Dates: |
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| Volume: | 409 | ||||||||||||||||||
| Article Number: | 139923 | ||||||||||||||||||
| DOI: | 10.1016/j.electacta.2022.139923 | ||||||||||||||||||
| Status: | Peer Reviewed | ||||||||||||||||||
| Publication Status: | Published | ||||||||||||||||||
| Access rights to Published version: | Open Access (Creative Commons) | ||||||||||||||||||
| Date of first compliant deposit: | 22 February 2022 | ||||||||||||||||||
| Date of first compliant Open Access: | 23 February 2022 | ||||||||||||||||||
| RIOXX Funder/Project Grant: |
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