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The apparent surface free energy of rare earth oxides is governed by hydrocarbon adsorption
The surface free energy of rare earth oxides (REOs) has been debated during the last decade, with some reporting REOs to be intrinsically hydrophilic and others reporting hydrophobic. Here, we investigate the wettability and surface chemistry of pristine and smooth REO surfaces, conclusively showing...
Autores principales: | , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
Elsevier
2021
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8752908/ https://www.ncbi.nlm.nih.gov/pubmed/35036875 http://dx.doi.org/10.1016/j.isci.2021.103691 |
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author | Oh, Junho Orejon, Daniel Park, Wooyoung Cha, Hyeongyun Sett, Soumyadip Yokoyama, Yukihiro Thoreton, Vincent Takata, Yasuyuki Miljkovic, Nenad |
author_facet | Oh, Junho Orejon, Daniel Park, Wooyoung Cha, Hyeongyun Sett, Soumyadip Yokoyama, Yukihiro Thoreton, Vincent Takata, Yasuyuki Miljkovic, Nenad |
author_sort | Oh, Junho |
collection | PubMed |
description | The surface free energy of rare earth oxides (REOs) has been debated during the last decade, with some reporting REOs to be intrinsically hydrophilic and others reporting hydrophobic. Here, we investigate the wettability and surface chemistry of pristine and smooth REO surfaces, conclusively showing that hydrophobicity stems from wettability transition due to volatile organic compound adsorption. We show that, for indoor ambient atmospheres and well-controlled saturated hydrocarbon atmospheres, the apparent advancing and receding contact angles of water increase with exposure time. We examined the surfaces comprehensively with multiple surface analysis techniques to confirm hydrocarbon adsorption and correlate it to wettability transition mechanisms. We demonstrate that both physisorption and chemisorption occur on the surface, with chemisorbed hydrocarbons promoting further physisorption due to their high affinity with similar hydrocarbon molecules. This study offers a better understanding of the intrinsic wettability of REOs and provides design guidelines for REO-based durable hydrophobic coatings. |
format | Online Article Text |
id | pubmed-8752908 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2021 |
publisher | Elsevier |
record_format | MEDLINE/PubMed |
spelling | pubmed-87529082022-01-14 The apparent surface free energy of rare earth oxides is governed by hydrocarbon adsorption Oh, Junho Orejon, Daniel Park, Wooyoung Cha, Hyeongyun Sett, Soumyadip Yokoyama, Yukihiro Thoreton, Vincent Takata, Yasuyuki Miljkovic, Nenad iScience Article The surface free energy of rare earth oxides (REOs) has been debated during the last decade, with some reporting REOs to be intrinsically hydrophilic and others reporting hydrophobic. Here, we investigate the wettability and surface chemistry of pristine and smooth REO surfaces, conclusively showing that hydrophobicity stems from wettability transition due to volatile organic compound adsorption. We show that, for indoor ambient atmospheres and well-controlled saturated hydrocarbon atmospheres, the apparent advancing and receding contact angles of water increase with exposure time. We examined the surfaces comprehensively with multiple surface analysis techniques to confirm hydrocarbon adsorption and correlate it to wettability transition mechanisms. We demonstrate that both physisorption and chemisorption occur on the surface, with chemisorbed hydrocarbons promoting further physisorption due to their high affinity with similar hydrocarbon molecules. This study offers a better understanding of the intrinsic wettability of REOs and provides design guidelines for REO-based durable hydrophobic coatings. Elsevier 2021-12-25 /pmc/articles/PMC8752908/ /pubmed/35036875 http://dx.doi.org/10.1016/j.isci.2021.103691 Text en © 2021 The Author(s) https://creativecommons.org/licenses/by/4.0/This is an open access article under the CC BY license (http://creativecommons.org/licenses/by/4.0/). |
spellingShingle | Article Oh, Junho Orejon, Daniel Park, Wooyoung Cha, Hyeongyun Sett, Soumyadip Yokoyama, Yukihiro Thoreton, Vincent Takata, Yasuyuki Miljkovic, Nenad The apparent surface free energy of rare earth oxides is governed by hydrocarbon adsorption |
title | The apparent surface free energy of rare earth oxides is governed by hydrocarbon adsorption |
title_full | The apparent surface free energy of rare earth oxides is governed by hydrocarbon adsorption |
title_fullStr | The apparent surface free energy of rare earth oxides is governed by hydrocarbon adsorption |
title_full_unstemmed | The apparent surface free energy of rare earth oxides is governed by hydrocarbon adsorption |
title_short | The apparent surface free energy of rare earth oxides is governed by hydrocarbon adsorption |
title_sort | apparent surface free energy of rare earth oxides is governed by hydrocarbon adsorption |
topic | Article |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC8752908/ https://www.ncbi.nlm.nih.gov/pubmed/35036875 http://dx.doi.org/10.1016/j.isci.2021.103691 |
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