Journal
SURFACE & COATINGS TECHNOLOGY
Volume 258, Issue -, Pages 142-145Publisher
ELSEVIER SCIENCE SA
DOI: 10.1016/j.surfcoat.2014.09.040
Keywords
Superhydrophobic; Carbon nanotube; Switching water adhesion; Water transportation on-off
Funding
- National Nature Science Foundation of China [21301141]
- program for Changjiang Scholars and Innovative Research Team in University, China [IRT1177]
- Nature Science Foundation of Gansu Province, China [145RJYA241]
- Scientific and Technical Innovation Project of Northwest Normal University [NWNU-LKQN-12-6]
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We used a simple spray-coating process to prepare superhydrophobic carbon nanotube (CNT) surfaces with a water contact angle (CA) of 160 degrees and a sliding angle (SA) of 3 degrees on desired substrates without any chemical modification. After being irradiated by UV light through a photomask, the as-prepared low adhesive superhydrophobic CNT surface changes to high water adhesion. However, further heating the irradiated CNT surface, the irradiated CNT surface becomes its original low water adhesion again. Reversibly switchable transition between the low water adhesion and high water adhesion can be realized simply by UV/mask illumination and heat treatment alternately. Simultaneously, the adhesive force of the superhydrophobic CNT surfaces changes from low (similar to 8.9 mu N) to very high (similar to 133.6 mu N). Based on the reversible water adhesion transition on the superhydrophobic CNT surfaces through UV illumination and heat treatment alternately, switching on-off water transportation was achieved. This switchable water adhesion on the superhydrophobic CNT surfaces could have potential applications in areas requiring multifunctional CNT-based surfaces. (C) 2014 Elsevier B.V. All rights reserved.
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