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When and how self-cleaning of superhydrophobic surfaces works
Despite the enormous interest in superhydrophobicity for self-cleaning, a clear picture of contaminant removal is missing, in particular, on a single-particle level. Here, we monitor the removal of individual contaminant particles on the micrometer scale by confocal microscopy. We correlate this spa...
Autores principales: | , , , , , , , , , |
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Formato: | Online Artículo Texto |
Lenguaje: | English |
Publicado: |
American Association for the Advancement of Science
2020
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Materias: | |
Acceso en línea: | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6968945/ https://www.ncbi.nlm.nih.gov/pubmed/32010764 http://dx.doi.org/10.1126/sciadv.aaw9727 |
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author | Geyer, Florian D’Acunzi, Maria Sharifi-Aghili, Azadeh Saal, Alexander Gao, Nan Kaltbeitzel, Anke Sloot, Tim-Frederik Berger, Rüdiger Butt, Hans-Jürgen Vollmer, Doris |
author_facet | Geyer, Florian D’Acunzi, Maria Sharifi-Aghili, Azadeh Saal, Alexander Gao, Nan Kaltbeitzel, Anke Sloot, Tim-Frederik Berger, Rüdiger Butt, Hans-Jürgen Vollmer, Doris |
author_sort | Geyer, Florian |
collection | PubMed |
description | Despite the enormous interest in superhydrophobicity for self-cleaning, a clear picture of contaminant removal is missing, in particular, on a single-particle level. Here, we monitor the removal of individual contaminant particles on the micrometer scale by confocal microscopy. We correlate this space- and time-resolved information with measurements of the friction force. The balance of capillary and adhesion force between the drop and the contamination on the substrate determines the friction force of drops during self-cleaning. These friction forces are in the range of micro-Newtons. We show that hydrophilic and hydrophobic particles hardly influence superhydrophobicity provided that the particle size exceeds the pore size or the thickness of the contamination falls below the height of the protrusions. These detailed insights into self-cleaning allow the rational design of superhydrophobic surfaces that resist contamination as demonstrated by outdoor environmental (>200 days) and industrial standardized contamination experiments. |
format | Online Article Text |
id | pubmed-6968945 |
institution | National Center for Biotechnology Information |
language | English |
publishDate | 2020 |
publisher | American Association for the Advancement of Science |
record_format | MEDLINE/PubMed |
spelling | pubmed-69689452020-01-31 When and how self-cleaning of superhydrophobic surfaces works Geyer, Florian D’Acunzi, Maria Sharifi-Aghili, Azadeh Saal, Alexander Gao, Nan Kaltbeitzel, Anke Sloot, Tim-Frederik Berger, Rüdiger Butt, Hans-Jürgen Vollmer, Doris Sci Adv Research Articles Despite the enormous interest in superhydrophobicity for self-cleaning, a clear picture of contaminant removal is missing, in particular, on a single-particle level. Here, we monitor the removal of individual contaminant particles on the micrometer scale by confocal microscopy. We correlate this space- and time-resolved information with measurements of the friction force. The balance of capillary and adhesion force between the drop and the contamination on the substrate determines the friction force of drops during self-cleaning. These friction forces are in the range of micro-Newtons. We show that hydrophilic and hydrophobic particles hardly influence superhydrophobicity provided that the particle size exceeds the pore size or the thickness of the contamination falls below the height of the protrusions. These detailed insights into self-cleaning allow the rational design of superhydrophobic surfaces that resist contamination as demonstrated by outdoor environmental (>200 days) and industrial standardized contamination experiments. American Association for the Advancement of Science 2020-01-17 /pmc/articles/PMC6968945/ /pubmed/32010764 http://dx.doi.org/10.1126/sciadv.aaw9727 Text en Copyright © 2020 The Authors, some rights reserved; exclusive licensee American Association for the Advancement of Science. No claim to original U.S. Government Works. Distributed under a Creative Commons Attribution NonCommercial License 4.0 (CC BY-NC). http://creativecommons.org/licenses/by-nc/4.0/ This is an open-access article distributed under the terms of the Creative Commons Attribution-NonCommercial license (http://creativecommons.org/licenses/by-nc/4.0/) , which permits use, distribution, and reproduction in any medium, so long as the resultant use is not for commercial advantage and provided the original work is properly cited. |
spellingShingle | Research Articles Geyer, Florian D’Acunzi, Maria Sharifi-Aghili, Azadeh Saal, Alexander Gao, Nan Kaltbeitzel, Anke Sloot, Tim-Frederik Berger, Rüdiger Butt, Hans-Jürgen Vollmer, Doris When and how self-cleaning of superhydrophobic surfaces works |
title | When and how self-cleaning of superhydrophobic surfaces works |
title_full | When and how self-cleaning of superhydrophobic surfaces works |
title_fullStr | When and how self-cleaning of superhydrophobic surfaces works |
title_full_unstemmed | When and how self-cleaning of superhydrophobic surfaces works |
title_short | When and how self-cleaning of superhydrophobic surfaces works |
title_sort | when and how self-cleaning of superhydrophobic surfaces works |
topic | Research Articles |
url | https://www.ncbi.nlm.nih.gov/pmc/articles/PMC6968945/ https://www.ncbi.nlm.nih.gov/pubmed/32010764 http://dx.doi.org/10.1126/sciadv.aaw9727 |
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