Journal
NANO LETTERS
Volume 13, Issue 11, Pages 5541-5548Publisher
AMER CHEMICAL SOC
DOI: 10.1021/nl403144w
Keywords
Block copolymers; nanorods; adhesion; biomimetics; switching; humidity
Categories
Funding
- German Research Foundation (DFG) [C-10, SFB 677]
- Alexander-von-Humboldt Foundation
Ask authors/readers for more resources
We report reversible adhesion switching on porous fibrillar polystyrene-block-poly(2-vinyl pyridine) (PS-b-P2VP) adhesive pads by humidity changes. Adhesion at a relative humidity of 90% was more than nine times higher than at a relative humidity of 2%. On nonporous fibrillar adhesive pads of the same material, adhesion increased only by a factor of similar to 3.3. The switching performance remained unchanged in at least 10 successive high/low humidity cycles. Main origin of enhanced adhesion at high humidity is the humidity-induced decrease in the elastic Modulus of the polar component P2VP rather than capillary force. The presence of spongelike continuous internal pore systems with walls consisting of P2VP significantly leveraged this effect. Fibrillar adhesive pads on which adhesion is switchable by humidity changes may be used for preconcentration of airborne particulates, pollutants, and germs combined with triggered surface deaning.
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available