The DOI matches its Crossref record; 20 of the 20 references it cites were found in a registry or an index.
Lotus Effect Amplifies Light-Induced Contact Angle Switching
Abstract
A rough surface morphology is shown to significantly amplify the light-induced change in water contact angle of a photoresponsive surface. Smooth Si surfaces and fractally rough Si nanowire surfaces grown on a Si substrate were studied, both coated with a hydrophobic monolayer containing photochromic spiropyran molecules. Under visible irradiation the spiropyran is in a closed, hydrophobic form, whereas UV irradiation converts the spiropyran to a polar, hydrophilic form, reducing the contact angle. The superhydrophobic nanowire surface both amplifies the light-induced contact angle change by a factor of 2 relative to a smooth surface and reduces the contact angle hysteresis. As a result the UV-induced advancing contact angle is lower than the receding contact angle under visible irradiation, allowing water drops to be moved solely under the influence of a UV−visible light gradient. The amplification of the reversible light-induced wetting angle change was predicted using the Wenzel model for fractally rough surfaces. The model and amplification effects are expected to apply to other types of stimuli-induced contact angle changes such as that by heat or electrical potentials.
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Citations
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Cited by
Bioinspired Surfaces with Superwettability: New Insight on Theory, Design, and Applications
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Dual‐Responsive Surfaces That Switch between Superhydrophilicity and Superhydrophobicity
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Metadata
- Authors
- Rosario, R., Gust, D., Garcia, A. A., Hayes, M., Taraci, J. L., Clement, T., Dailey, J. W., & Picraux, S. T.
- Venue
- The Journal of Physical Chemistry B
- Publisher
- American Chemical Society (ACS)
- Published
- 2004-07-29
- Volume
- 108
- Issue
- 34
- Pages
- 12640-12642
- ISSN
- 1520-5207 (ISSN-L)
- 1520-6106
- OpenAlex
- W1977243930
- Cited by
- 260
- References
- 20
- FWCI
- 9.79
- Type
- journal article
- Language
- en
- Open access
- closed
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Contains information from the Semantic Scholar Academic Graph Datasets, made available under the ODC Attribution License (ODC-BY 1.0).
Semantic Scholar’s data is described in: Kinney, R., et al. (2023). The Semantic Scholar Open Data Platform. arXiv:2301.10140.
