Bulletin of the American Physical Society
2007 APS March Meeting
Volume 52, Number 1
Monday–Friday, March 5–9, 2007; Denver, Colorado
Session Y19: Surfaces, Interfaces, and Colloids III
11:15 AM–1:51 PM,
Friday, March 9, 2007
Colorado Convention Center Room: 104
Sponsoring Unit: DCP
Chair: Nancy Levinger, Colorado State University
Abstract ID: BAPS.2007.MAR.Y19.5
Abstract: Y19.00005 : Drops Bouncing on a Superhydrophobic Surface*
12:03 PM–12:15 PM
Preview Abstract Abstract
Frank van Swol
(Sandia National Laboratories)
Low solid interfacial energy and fractally rough surface topography confer to Lotus plants superhydrophobic (SH) properties like high contact angles, rolling and bouncing of liquid droplets, and self-cleaning of particle contaminants. By exploiting the porous fractal structure of a novel, synthetic SH surface it is possible to produce a synthetic lotus effect. This is relevant to realizing self-cleaning properties for particle concentration, and the slippery nature of the coating can be used to enhance the performance of fluidic devices. Here we report on molecular dynamics (MD) and some classical density functional theory calculations that provide valuable insight into the conditions needed to cause liquid droplets to form and bounce on a surface. The MD results report on the details of the droplets impacting surfaces of varying wettability, ranging from complete wetting to complete drying. For the SH surfaces we present results for the contact time, between droplet and surface, as a function of impact velocity, droplet size and surface friction.
*Supported by Basic Energy Sciences, and the DOE Office of Science's ASCR program. Sandia is a multi-program laboratory operated by Sandia Corporation, a Lockheed-Martin Company, for the US DOE under Contract No. DE-AC04-94AL85000.
To cite this abstract, use the following reference: http://meetings.aps.org/link/BAPS.2007.MAR.Y19.5
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