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Article: Droplet detachment behavior from a rough hydrophilic surface

TitleDroplet detachment behavior from a rough hydrophilic surface
Authors
KeywordsWork of adhesion
Microdroplet
Surface roughness
Detachment behavior
Liquid film
Issue Date2020
PublisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jaerosci
Citation
Journal of Aerosol Science, 2020, v. 139, p. article no. 105469 How to Cite?
AbstractUnderstanding of the droplet detachment behavior from rough hydrophilic surfaces is important in many biological and industrial applications such as biomedicine, surface coating, and pathogen-laden aerosol resuspension. Due to the partial detachment of the droplet on hydrophilic surfaces, leaving behind some droplet residues, the adhesion behavior is extremely complicated. Here we reveal a new adhesion mechanism between a droplet and a rough hydrophilic surface. The adhesion behavior is controlled by a liquid film stuck in the surface microstructure. We establish a model to describe the contributions of liquid film and naked solid peaks, to the work of adhesion and verify the model experimentally. We also find that the normal adhesion force is about 3.35 ± 0.25 times of the lateral adhesion force for different surface roughness, meaning that the separation direction is an important factor affecting adhesion due to the different separation mechanisms. The results of this work shed new insights on the understanding of droplet detachment and adhesion to a rough surface.
Persistent Identifierhttp://hdl.handle.net/10722/286226
ISSN
2019 Impact Factor: 2.649
2015 SCImago Journal Rankings: 1.702

 

DC FieldValueLanguage
dc.contributor.authorWang, CT-
dc.contributor.authorLeung, WT-
dc.contributor.authorXu, JC-
dc.contributor.authorFu, SC-
dc.contributor.authorChao, CYH-
dc.date.accessioned2020-08-31T07:00:56Z-
dc.date.available2020-08-31T07:00:56Z-
dc.date.issued2020-
dc.identifier.citationJournal of Aerosol Science, 2020, v. 139, p. article no. 105469-
dc.identifier.issn0021-8502-
dc.identifier.urihttp://hdl.handle.net/10722/286226-
dc.description.abstractUnderstanding of the droplet detachment behavior from rough hydrophilic surfaces is important in many biological and industrial applications such as biomedicine, surface coating, and pathogen-laden aerosol resuspension. Due to the partial detachment of the droplet on hydrophilic surfaces, leaving behind some droplet residues, the adhesion behavior is extremely complicated. Here we reveal a new adhesion mechanism between a droplet and a rough hydrophilic surface. The adhesion behavior is controlled by a liquid film stuck in the surface microstructure. We establish a model to describe the contributions of liquid film and naked solid peaks, to the work of adhesion and verify the model experimentally. We also find that the normal adhesion force is about 3.35 ± 0.25 times of the lateral adhesion force for different surface roughness, meaning that the separation direction is an important factor affecting adhesion due to the different separation mechanisms. The results of this work shed new insights on the understanding of droplet detachment and adhesion to a rough surface.-
dc.languageeng-
dc.publisherPergamon. The Journal's web site is located at http://www.elsevier.com/locate/jaerosci-
dc.relation.ispartofJournal of Aerosol Science-
dc.subjectWork of adhesion-
dc.subjectMicrodroplet-
dc.subjectSurface roughness-
dc.subjectDetachment behavior-
dc.subjectLiquid film-
dc.titleDroplet detachment behavior from a rough hydrophilic surface-
dc.typeArticle-
dc.identifier.emailFu, SC: scfu@hku.hk-
dc.identifier.emailChao, CYH: cyhchao@hku.hk-
dc.identifier.authorityFu, SC=rp02549-
dc.identifier.authorityChao, CYH=rp02396-
dc.description.naturelink_to_subscribed_fulltext-
dc.identifier.doi10.1016/j.jaerosci.2019.105469-
dc.identifier.scopuseid_2-s2.0-85073602488-
dc.identifier.hkuros313328-
dc.identifier.volume139-
dc.identifier.spagearticle no. 105469-
dc.identifier.epagearticle no. 105469-
dc.publisher.placeUnited Kingdom-

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