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Superhydrophobic Surfaces

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*5/15/2012

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Articles with Abstracts

Three-Level Biomimetic Rice-Leaf Surfaces with Controllable Anisotropic Sliding
(29272932)
Advanced Functional Materials 21  #15 (2011)

Wu et al of Jilin University and the Chinese Academy of Sciences, China, found, that the height of 200-μm-width groove arrays on rice leaves reaches up to 45 μm, far greater than the smaller microgrooves that are widely adopted for the study of anisotropic wetting.  A new model based on three-level microstructures (macro/micro/nano) is developed to interpret the anisotropic sliding behavior.  Moreover, artificial rice leaves with different macrogrooves are demonstrated by combining micro/nanostructures and macrogrooves, which are prepared by photolithography, PDMS imprinting, and micro/nanostructure coating.  Sliding-angle measurement further prove that the third-level macrogroove arrays are the determining factor for anisotropic sliding.  Finally, a new testing method, curvature-assisted droplet oscillation (CADO), is developed to quantitatively reveal the anisotropic dynamic behavior of biomimetic rice-leaf-like surfaces. (RDC  8/9/2011)

Fabrication and characterization of superhydrophobic high opacity paper with titanium dioxide nanoparticles
(2600-2605)
Journal of Materials Science 46 #8 (2011)|
Lianghui Huang et al, China and USA, prepared a new type of paper with superhydrophobic surface by adding modified nano-TiO2 to cellulose pulp.  Nano-TiO2 powder was first dispersed with a high-speed homogenizer, followed by surface modification with the coupling agent, 3-(trimethoxysilyl) propyl methacrylate (MPS). The superhydrophobic and opaque paper was obtained by adding the modified nano-TiO2 to plant fiber to change its characteristics from hydrophilic to hydrophobic.  The water contact angles for the modified paper ranged from 126.5 to 154.2, and the sliding angle was <3. Moreover, many well-dispersed nano-TiO2 protuberances were observed on the surface of the paper, which further confirmed that the obtained paper was superhydrophobic on account of its nanostructure.  (RDC 2/22/2011)

Motion of liquid droplets on a superhydrophobic oleophobic surface
(69-76)  Journal of Materials Science 46 #1 (2011)
Lee and Owens showed that developing a superhydrophobic oleophobic material is achieved by two criteria: low surface energy and properly designed surface morphology. The effect of the contact angle hysteresis on the roll-off angle is described to understand the motion of a droplet when the droplet begins to roll off.  (RDC 1/12/2011)

One-Step Modification of Superhydrophobic Surfaces by a Mussel-Inspired Polymer Coating
(pages 94019404)Angewandte Chemie International Edition 49 #49 (2010)
Kang et al converted superhydrophobic surfaces by soft-lithographic techniques, such as micromolding in capillaries.  The resulting patterned surface showed high water adhesion properties as well as superhydrophobic properties.  (RDC 12/14/2010)

Direct Three-Dimensional Imaging of the Buried Interfaces between Water and Superhydrophobic Surfaces
(pages 91459148)Angewandte Chemie International Edition 49 #48 (2010)
Luo et al used confocal laser scanning microscopy can be used to provide distinct 3D images of air at buried superhydrophobic interfaces (see picture, bright area).  Two hydrophobic states, Wenzel and Cassie states, were quantitatively visualized and identified.  The 10μm thick air cushion drastically decreases water adhesion, thus making water droplets roll off the surface and readily remove surface contaminants (self-cleaning).  (RDC 11/22/2010)

Structural properties and superhydrophobicity of electrospun polypropylene fibers from solution and melt  
( 6005-6012) Polymer 51 #25 (2010)

Cho et al from Cornell University have shown that electrospun PP fiber webs from solution and melt are superhydrophobic with a water contact angle about 151 compared to a commercial PP non-woven web and a compression molded PP film with contact angles of 104 and 112, respectively.  This enhanced hydrophobicity of electrospun PP fiber webs contribute to excellent barrier performance without losing permeability when they are applied to protective clothing.  (RDC 11/18/2010)

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Roger D. Corneliussen
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Copyright 2012 by Roger D. Corneliussen.
No part of this transmission is to be duplicated in any manner or forwarded by electronic mail without the express written permission of Roger D. Corneliussen
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* Date of latest addition; date of first entry is 5/15/2012.