Nano Replication for Hybrid Elastomer/Metal-Oxide Surfaces
Elojuhla presentation31st August
[email protected] of Materials Science and
Engineering & Micronova Centre for Nanofabrication, School of
Chemical TechnologyExoskeleton for Robust
Superhydrophobicity8/23/20161
Superhydrophobicity in Nature
8/21/20162
8/23/20163
Some applications
8/24/20164How does it work?
12Surface structuresSurface Chemistry
Air layer
8/23/20165Which one is more important?
Surface structures vs Surface Chemistry
ACS Appl. Mater. Interfaces,2015,7(1), pp 941949
ACS Appl. Mater. Interfaces,2015,7(28), pp 1559315599
Socrative Question8/21/20166Which structure works better to
repel liquids?
ABC
B is correct6
Are they robust enough?
12438/21/20167
5
6
8/21/20168Exoskeleton argument
8/23/20169Hybrid of PDMS/titania
ALD titania Aluminum template/titania
Replica PDMS/titania
Soft Matter, 2016,12, 6526-6535, DOI:10.1039/C6SM01095DAluminum
template/titania
Curing PDMS
8/24/201610PDMS/Titania Superhydrophobicity
wine coffee waterPDMS/titania
advancingrecedingRolling angle 5
PDMS/titaniabloodThanks to Esko Kankuri
PDMS/titaniasalivaThanks to myself
10
8/21/201611Robust superhydrophobicity due to exoskeleton
titaniaTry me
Knife scratches
8/21/201612Non-planar superhydrophobic surfacesFuture plans
Curing PDMS ALD titania on etched aluminumMicroscopic view
inside of tubesPDMS/titania
Curing PDMS between two tubes, inner tube is etched with HCl and
coated with ALD titaniaSacrificial etching of aluminum tubes
a)b)
AluminumAluminum etching
Blood in PDMS vs PDMS/titania tubes8/22/201613
Reference PDMS tubeSuperhydrophobic PDMS/titania tube
8/22/201614
Keep calm&mimic NATURE
