Year: 2011
Type: article
Abstract: We develop a 2D model which predicts the contact angle hysteresis (CAH) introduced by smooth micropatterned defects. The defects are modeled by a smooth function, and the CAH is explained using a tangent line solution. When the liquid micro-meniscus touches both sides of the defect simultaneously, depinning of the contact line occurs and the droplet “pops-up.” The defects are fabricated using the photoresist SU-8. The experimental results, using common liquids (water, isopropyl alcohol, and ethylene glycol), agree well with the predictions of the model. The profile of the defect has a large influence on the CAH.
Source: Applied Physics Letters
DOI: 10.1063/1.3657140
Language: English
Subfield: Surfaces, Coatings and Films
Field: Materials Science
Domain: Physical Sciences
Open Access status: bronze
OpenAlex ID: W2007080418