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Unidirectional drying of a suspension of diffusiophoretic colloids under gravity
Recent experiments (K. Inoue and S. Inasawa, RSC Adv., 2020, 10, 15763–15768) and simulations (J.-B. Salmon and F. Doumenc, Phys. Rev. Fluids, 2020, 5, 024201) demonstrated the significant impact of gravity on unidirectional drying of a colloidal suspension. However, under gravity, the role of collo...
Autores principales: | , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
The Royal Society of Chemistry
2023
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10026375/ https://www.ncbi.nlm.nih.gov/pubmed/36950706 http://dx.doi.org/10.1039/d3ra00115f |
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author | Xu, Jinjie Wang, Zhikui Chu, Henry C. W. |
author_facet | Xu, Jinjie Wang, Zhikui Chu, Henry C. W. |
author_sort | Xu, Jinjie |
collection | PubMed |
description | Recent experiments (K. Inoue and S. Inasawa, RSC Adv., 2020, 10, 15763–15768) and simulations (J.-B. Salmon and F. Doumenc, Phys. Rev. Fluids, 2020, 5, 024201) demonstrated the significant impact of gravity on unidirectional drying of a colloidal suspension. However, under gravity, the role of colloid transport induced by an electrolyte concentration gradient, a mechanism known as diffusiophoresis, is unexplored to date. In this work, we employ direct numerical simulations and develop a macrotransport theory to analyze the advective–diffusive transport of an electrolyte-colloid suspension in a unidirectional drying cell under the influence of gravity and diffusiophoresis. We report three key findings. First, drying a suspension of solute-attracted diffusiophoretic colloids causes the strongest phase separation and generates the thinnest colloidal layer compared to non-diffusiophoretic or solute-repelled colloids. Second, when colloids are strongly solute-repelled, diffusiophoresis prevents the formation of colloid concentration gradient and hence gravity has a negligible effect on colloidal layer formation. Third, our macrotransport theory predicts new scalings for the growth of the colloidal layer. The scalings match with direct numerical simulations and indicate that the colloidal layer produced by solute-repelled diffusiophoretic colloids could be an order of magnitude thicker compared to non-diffusiophoretic or solute-attracted colloids. Our results enable tailoring the separation of colloid-electrolyte suspensions by tuning the interactions between the solvent, electrolyte, and colloids under Earth's or microgravity, which is central to ground-based and in-space applications. |
format | Online Article Text |
id | pubmed-10026375 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2023 |
publisher | The Royal Society of Chemistry |
record_format | MEDLINE/PubMed |
spelling | pubmed-100263752023-03-21 Unidirectional drying of a suspension of diffusiophoretic colloids under gravity Xu, Jinjie Wang, Zhikui Chu, Henry C. W. RSC Adv Chemistry Recent experiments (K. Inoue and S. Inasawa, RSC Adv., 2020, 10, 15763–15768) and simulations (J.-B. Salmon and F. Doumenc, Phys. Rev. Fluids, 2020, 5, 024201) demonstrated the significant impact of gravity on unidirectional drying of a colloidal suspension. However, under gravity, the role of colloid transport induced by an electrolyte concentration gradient, a mechanism known as diffusiophoresis, is unexplored to date. In this work, we employ direct numerical simulations and develop a macrotransport theory to analyze the advective–diffusive transport of an electrolyte-colloid suspension in a unidirectional drying cell under the influence of gravity and diffusiophoresis. We report three key findings. First, drying a suspension of solute-attracted diffusiophoretic colloids causes the strongest phase separation and generates the thinnest colloidal layer compared to non-diffusiophoretic or solute-repelled colloids. Second, when colloids are strongly solute-repelled, diffusiophoresis prevents the formation of colloid concentration gradient and hence gravity has a negligible effect on colloidal layer formation. Third, our macrotransport theory predicts new scalings for the growth of the colloidal layer. The scalings match with direct numerical simulations and indicate that the colloidal layer produced by solute-repelled diffusiophoretic colloids could be an order of magnitude thicker compared to non-diffusiophoretic or solute-attracted colloids. Our results enable tailoring the separation of colloid-electrolyte suspensions by tuning the interactions between the solvent, electrolyte, and colloids under Earth's or microgravity, which is central to ground-based and in-space applications. The Royal Society of Chemistry 2023-03-20 /pmc/articles/PMC10026375/ /pubmed/36950706 http://dx.doi.org/10.1039/d3ra00115f Text en This journal is © The Royal Society of Chemistry https://creativecommons.org/licenses/by/3.0/ |
spellingShingle | Chemistry Xu, Jinjie Wang, Zhikui Chu, Henry C. W. Unidirectional drying of a suspension of diffusiophoretic colloids under gravity |
title | Unidirectional drying of a suspension of diffusiophoretic colloids under gravity |
title_full | Unidirectional drying of a suspension of diffusiophoretic colloids under gravity |
title_fullStr | Unidirectional drying of a suspension of diffusiophoretic colloids under gravity |
title_full_unstemmed | Unidirectional drying of a suspension of diffusiophoretic colloids under gravity |
title_short | Unidirectional drying of a suspension of diffusiophoretic colloids under gravity |
title_sort | unidirectional drying of a suspension of diffusiophoretic colloids under gravity |
topic | Chemistry |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC10026375/ https://www.ncbi.nlm.nih.gov/pubmed/36950706 http://dx.doi.org/10.1039/d3ra00115f |
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