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The “Lotus Effect” Explained: Two Reasons Why Two Length Scales of Topography Are Important
Open accessAbstract
Surfaces containing 4 x 8 x 40 microm staggered rhombus posts were hydrophobized using two methods. One, using a dimethyldichlorosilane reaction in the vapor phase, introduces a smooth modified layer, and the other, a solution reaction using methyltrichlorosilane, imparts a second (nanoscopic) length scale of topography. The smooth modified surface exhibits contact angles of thetaA/thetaR = 176 degrees /156 degrees . Arguments are made that the pinning of the receding contact line by the post tops (with thetaA/thetaR = 104 degrees /103 degrees ) is responsible for the hysteresis. The second level of topography raises the contact angles of the post tops and the macroscopic sample to theta(A)/theta(R) = >176 degrees />176 degrees and eliminates hysteresis. The increase in Laplace pressure due to the increase in the advancing contact angle of the post tops is a second reason that two length scales of topography are important.
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Citations
Cited by
Banerjee, I., Pangule, R. C., & Kane, R. S. (2011) · Advanced Materials · doi:10.1002/adma.201001215 · Cited by 2,749
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Wang, S., Liu, K., Yao, X., & Jiang, L. (2015) · Chemical Reviews · doi:10.1021/cr400083y · Cited by 1,646
Definition of Superhydrophobic States
Wang, S., & Jiang, L. (2007) · Advanced Materials · doi:10.1002/adma.200700934 · Cited by 969
Yetisen, A. K., Qu, H., Manbachi, A., Butt, H., Dokmeci, M. R., Hinestroza, J. P., Skorobogatiy, M., Khademhosseini, A., & Yun, S. H. (2016) · ACS Nano · doi:10.1021/acsnano.5b08176 · Cited by 752
Xu, Q. F., Liu, Y., Lin, F.-J., Mondal, B., & Lyons, A. M. (2013) · ACS Applied Materials & Interfaces · doi:10.1021/am401668y · Cited by 225
Metadata
- Authors
- Gao, L., & McCarthy, T. J.
- Venue
- Langmuir
- Publisher
- American Chemical Society (ACS)
- Published
- 2006-03-01
- Volume
- 22
- Issue
- 7
- Pages
- 2966-2967
- ISSN
- 0743-7463 (ISSN-L)
- 1520-5827
- OpenAlex
- W2026401636
- Cited by
- 682
- References
- 0
- FWCI
- 24.39
- Type
- journal article
- Language
- en
- Open access
- green
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