Hierarchical Silicon Etched Structures for Controlled Hydrophobicity/Superhydrophobicity
- 11 October 2007
- journal article
- research article
- Published by American Chemical Society (ACS) in Nano Letters
- Vol. 7 (11), 3388-3393
- https://doi.org/10.1021/nl0717457
Abstract
Silicon surface hydrophobicity has been varied by using silane treatments on silicon pyramid surfaces generated by KOH anisotropic etching. Results demonstrated that by altering the surface hydrophobicity, the apparent contact angle changed in accord with the Wenzel equation for surface structures with inclined side walls. Hierarchical structures were also constructed from Si pyramids where nanostructures were added by Au-assisted electroless HF/H2O2 etching. Surface hydrophobicity and superhydrophobicity were achieved by surface modification with a variety of silanes. Stability of the Cassie state of superhydrophobicity is described with respect to the Laplace pressure as indicated by the water droplet meniscus in contact with the hierarchical structures. The contact angle hysteresis observed is also discussed with respect to water/substrate adhesion.Keywords
This publication has 15 references indexed in Scilit:
- Micro- and nanoscale characterization of hydrophobic and hydrophilic leaf surfacesNanotechnology, 2006
- Black nonreflecting silicon surfaces for solar cellsApplied Physics Letters, 2006
- One‐Step Solution‐Immersion Process for the Fabrication of Stable Bionic Superhydrophobic SurfacesAdvanced Materials, 2006
- Superhydrophobic statesNature Materials, 2003
- Low-friction flows of liquid at nanopatterned interfacesNature Materials, 2003
- In-plane control of morphology and tunable photoluminescence in porous silicon produced by metal-assisted electroless chemical etchingJournal of Applied Physics, 2002
- Movement and regeneration of epicuticular waxes through plant cuticlesPlanta, 2001
- Characterization and Distribution of Water-repellent, Self-cleaning Plant SurfacesAnnals of Botany, 1997
- Purity of the sacred lotus, or escape from contamination in biological surfacesPlanta, 1997
- Light trapping properties of pyramidally textured surfacesJournal of Applied Physics, 1987