Ultimate Water Slide
March, 2010
Eric Loth
University of Virginia,
Department of Mechanical & Aerospace Engineering
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Hydrophobic Surfaces in Nature
Lotus Leaf
Micro-scale Rendering
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Nano-Textures for Fluid Repellency
Lotus-Leaf
Effect
Lotus-Leaf
Surface
50 nm
300 nm
2 μm
(J. Kim et al, 2002)
Nano-turf using
silicon etching
20 μm
100 nm
(P. Joseph et al, 2006)
Carbon nanotube forest
(A. Balasubramanian
et al, 2003)
(A. Cannon et al, 2006)
x
Chemically
treated copper
Micro-molding
50 μm
(T. Lin et al, 2009)
Electrospinning
Our surfaces are:
far more robust, easier to fabricate, not substrate limited, hierarchical, uniform,
don’t require functionalization, and can be oleophobic and even super-oleophobic
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Bio-mimicry of Hierarchal Surfaces
Lotus Leaf
Hostas Leaf
Lotus ESM Surface
Hostas ESM Surface
Nano-particle ESM
Carbon Nano-Tube ESM
4
Hierarchal Coatings
Nano-roughness on micron-sized surface features
5
Super-hydrophobic &
Super-oleophobic
Nano-Composites
θ
YouTube video:
“nanotexture”
(PMC:perfluoroalkyl methacrylic copolymer)
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Self-Cleaning (Low hysteresis) Coatings
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Wood Surfaces and Hydraulic Lines
For more videos/information visit: nanotexture.tumblr.com/
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Application to Hydraulic Lines
For more videos/information visit: nanotexture.tumblr.com/
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Application to Hydraulic Lines
For more videos/information visit: nanotexture.tumblr.com/
10
Beauty and Toughness
• Award Winner for MRS
“Science as Art” Contest
• Subject of upcoming segment
on American Institute of
Physics “Discoveries &
Breakthroughs Inside Science“
• My 2009 Holiday Card ☺
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Sandable Ph-resistant Performance
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Some recent Publications
•
A. Steele, I. Bayer & Loth, E. "Inherently Superoleophobic
Nanocomposite Coatings by Spray Atomization," Nano Letters Vol. 9,
pp.501-505 (2009).
•
I. Bayer, A. Steele*, P. Martorana, Loth, E. & Miller, L.
"Superhydrophobic cellulose-based bio-nanocomposite films from
Pickering emulsions," Applied Physics Letters Vol. 94, April 2009.
•
I. Bayer, A. Steele, P. Martorana, Loth, E. & S. Robinson & D.
Stevenson. "Biolubricant induced phase inversion and
superhydrophobicity in rubber-toughened biopolymer/ organoclay
nanocomposites," Applied Physics Letters Vol. 95, 2009.
•
I. Bayer, A. Steele, A. Brown, & Loth, E. “Transforming anaerobic
adhesives into highly durable and abrasion resistant superhydrophobic
organoclay nanocomposite films: A new hybrid spray adhesive for tough
superhydrophobicity ," Applied Physics Express December 2009
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