How surface and substrate chemistry affect slide electrification
The result's identifiers
Result code in IS VaVaI
<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F61389013%3A_____%2F24%3A00585189" target="_blank" >RIV/61389013:_____/24:00585189 - isvavai.cz</a>
Result on the web
<a href="https://pubs.acs.org/doi/10.1021/jacs.4c01015" target="_blank" >https://pubs.acs.org/doi/10.1021/jacs.4c01015</a>
DOI - Digital Object Identifier
<a href="http://dx.doi.org/10.1021/jacs.4c01015" target="_blank" >10.1021/jacs.4c01015</a>
Alternative languages
Result language
angličtina
Original language name
How surface and substrate chemistry affect slide electrification
Original language description
When water droplets move over a hydrophobic surface, they and the surface become oppositely charged by what is known as slide electrification. This effect can be used to generate electricity, but the physical and especially the chemical processes that cause droplet charging are still poorly understood. The most likely process is that at the base of the droplet, an electric double layer forms, and the interfacial charge remains on the surface behind the three-phase contact line. Here, we investigate the influence of the chemistry of surface (coating) and bulk (substrate) on the slide electrification. We measured the charge of a series of droplets sliding over hydrophobically coated (1–5 nm thickness) glass substrates. Within a series, the charge of the droplet decreases with the increasing droplet number and reaches a constant value after about 50 droplets (saturated state). We show that the charge of the first droplet depends on both coating and substrate chemistry. For a fully fluorinated or fully hydrogenated monolayer on glass, the influence of the substrate on the charge of the first droplet is negligible. In the saturated state, the chemistry of the substrate dominates. Charge separation can be considered as an acid base reaction between the ions of water and the surface. By exploiting the acidity (Pearson hardness) of elements such as aluminum, magnesium, or sodium, a positive saturated charge can be obtained by the counter charge remaining on the surface. With this knowledge, the droplet charge can be manipulated by the chemistry of the substrate.
Czech name
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Czech description
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Classification
Type
J<sub>imp</sub> - Article in a specialist periodical, which is included in the Web of Science database
CEP classification
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OECD FORD branch
10403 - Physical chemistry
Result continuities
Project
<a href="/en/project/GA22-02836S" target="_blank" >GA22-02836S: Water-soluble fluorinated polymers for the next-generation antifouling coatings and multimodal in vivo tracing</a><br>
Continuities
I - Institucionalni podpora na dlouhodoby koncepcni rozvoj vyzkumne organizace
Others
Publication year
2024
Confidentiality
S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů
Data specific for result type
Name of the periodical
Journal of the American Chemical Society
ISSN
0002-7863
e-ISSN
1520-5126
Volume of the periodical
146
Issue of the periodical within the volume
14
Country of publishing house
US - UNITED STATES
Number of pages
11
Pages from-to
10073-10083
UT code for WoS article
001195938200001
EID of the result in the Scopus database
2-s2.0-85189528156