Abstract
Superhydrophobic surfaces exhibit extreme water-repellent properties. These surfaces with high contact angle and low contact angle hysteresis also exhibit a self-cleaning effect and low drag for fluid flow. These surfaces are of interest in various applications, including self-cleaning windows, exterior paints for buildings, navigation ships, textiles, solar panels, and applications requiring antifouling and a reduction in fluid flow, e.g., in micro/nanochannels. Superhydrophobic surfaces can also be used for energy conservation and energy conversion, such as in the development of a microscale capillary engine. Superhydrophobic surfaces prevent the formation of menisci at a contacting interface and can be used to minimize adhesion and stiction. Certain plant leaves, notably lotus leaves, are known to be superhydrophobic and self-cleaning due to hierarchical roughness and the presence of wax tubules on the leaf surface. This phenomenon is known as the lotus effect. Superhydrophobic and self-cleaning surfaces can be produced by using roughness combined with hydrophobic coatings. In this chapter, the theory of roughness-induced superhydrophobicity and self-cleaning is presented, followed by the characterization data of natural leaf surfaces. Micro-, nano-, and hierarchical patterned structures have been fabricated, and the wetting properties and adhesion have been characterized to validate models and provide design guidelines for superhydrophobic and self-cleaning surfaces. In addition, a model of contact angle for oleophilic/phobic surfaces is presented. The wetting behavior of fabricated surfaces is investigated. Fundamental physical mechanisms of wetting responsible for the transition between various wetting regimes, contact angle, and contact angle hysteresis are also discussed.
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Abbreviations
- AFM:
-
atomic force microscope
- AFM:
-
atomic force microscopy
- AKD:
-
alkylketene dimer
- BCH:
-
brucite-type cobalt hydroxide
- CAH:
-
contact angle hysteresis
- CBD:
-
chemical bath deposition
- CCD:
-
charge-coupled device
- CNT:
-
carbon nanotube
- CVD:
-
chemical vapor deposition
- DI:
-
deionized
- DI:
-
digital instrument
- ESEM:
-
environmental scanning electron microscope
- FAA:
-
formaldehyde–acetic acid–ethanol
- GSED:
-
gaseous secondary-electron detector
- HAR:
-
high aspect ratio
- ITO:
-
indium tin oxide
- LA:
-
lauric acid
- LAR:
-
low aspect ratio
- LBL:
-
layer-by-layer
- MEMS:
-
microelectromechanical system
- MWCNT:
-
multiwall carbon nanotube
- NADIS:
-
nanoscale dispensing
- NEMS:
-
nanoelectromechanical system
- OTS:
-
octadecyltrichlorosilane
- P–V:
-
peak-to-valley
- PAA:
-
poly(acrylic acid)
- PAA:
-
porous anodic alumina
- PAH:
-
poly(allylamine hydrochloride)
- PC:
-
polycarbonate
- PDMS:
-
polydimethylsiloxane
- PECVD:
-
plasma-enhanced chemical vapor deposition
- PFDTES:
-
perfluorodecyltriethoxysilane
- PFOS:
-
perfluorooctanesulfonate
- PMMA:
-
poly(methyl methacrylate)
- PPy:
-
polypyrrole
- PS-PDMS:
-
poly(styrene-b-dimethylsiloxane)
- PS:
-
polystyrene
- PTFE:
-
polytetrafluoroethylene
- PUA:
-
polyurethane acrylate
- PVD:
-
physical vapor deposition
- RH:
-
relative humidity
- RMS:
-
root mean square
- SAM:
-
scanning acoustic microscopy
- SAM:
-
self-assembled monolayer
- SEM:
-
scanning electron microscope
- SEM:
-
scanning electron microscopy
- TMS:
-
tetramethylsilane
- TMS:
-
trimethylsilyl
- UV:
-
ultraviolet
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Bhushan, B., Jung, Y.C., Nosonovsky, M. (2010). Lotus Effect: Surfaces with Roughness-Induced Superhydrophobicity, Self-Cleaning, and Low Adhesion. In: Bhushan, B. (eds) Springer Handbook of Nanotechnology. Springer Handbooks. Springer, Berlin, Heidelberg. https://doi.org/10.1007/978-3-642-02525-9_42
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