Growth Dynamics of Water Drops on a Square-Pattern Rough Hydrophobic Surface

Autor:	R. D. Narhe, Daniel Beysens
Rok vydání:	2007
Předmět:	Chemistry Pillar Water Mineralogy Surfaces and Interfaces Penetration (firestop) Models Theoretical Condensed Matter Physics Chemical physics Rough surface Electrochemistry General Materials Science sense organs Wetting Hydrophobic and Hydrophilic Interactions Spectroscopy
Zdroj:	Langmuir. 23:6486-6489
ISSN:	1520-5827 0743-7463
DOI:	10.1021/la062021y
Popis:	Condensation on rough or superhydrophobic substrates can induce wetting behavior that is quite different from that of deposited or impinging drops. We investigate the growth dynamics of water drops in a well-controlled condensation chamber on a model rough hydrophobic surface made of square pillars. After having followed growth laws similar to those observed on flat surfaces, a transition to an air-pocket-like state occurred because of the bridging of the drops between the pillars. Another transition to the more stable Wenzel state is later ensured by a noticeable pillar self-drying process. Condensation ends up in a few large drops in a mixed Wenzel penetration regime. The drops are fed by neighboring channels and the adjacent pillars stay almost dry, a remarkable and seemingly general property of rough hydrophobic substrates.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_dedup___::d08f4922c223aa5c557cf886a78c31f2 https://doi.org/10.1021/la062021y Zobrazit plný text záznamu