Cargando…

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...

Descripción completa

Detalles Bibliográficos
Autores principales: Geyer, Florian, D’Acunzi, Maria, Sharifi-Aghili, Azadeh, Saal, Alexander, Gao, Nan, Kaltbeitzel, Anke, Sloot, Tim-Frederik, Berger, Rüdiger, Butt, Hans-Jürgen, Vollmer, Doris
Formato: Online Artículo Texto
Lenguaje:English
Publicado: American Association for the Advancement of Science 2020
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
_version_ 1783489237861007360
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
work_keys_str_mv AT geyerflorian whenandhowselfcleaningofsuperhydrophobicsurfacesworks
AT dacunzimaria whenandhowselfcleaningofsuperhydrophobicsurfacesworks
AT sharifiaghiliazadeh whenandhowselfcleaningofsuperhydrophobicsurfacesworks
AT saalalexander whenandhowselfcleaningofsuperhydrophobicsurfacesworks
AT gaonan whenandhowselfcleaningofsuperhydrophobicsurfacesworks
AT kaltbeitzelanke whenandhowselfcleaningofsuperhydrophobicsurfacesworks
AT sloottimfrederik whenandhowselfcleaningofsuperhydrophobicsurfacesworks
AT bergerrudiger whenandhowselfcleaningofsuperhydrophobicsurfacesworks
AT butthansjurgen whenandhowselfcleaningofsuperhydrophobicsurfacesworks
AT vollmerdoris whenandhowselfcleaningofsuperhydrophobicsurfacesworks