Nano Science and Technology Institute
Nanotech 2011 Vol. 1
Nanotech 2011 Vol. 1
Nanotechnology 2011: Advanced Materials, CNTs, Particles, Films and Composites
Chapter 2: Carbon Nano Structures & Devices

Carbon Nanotube Arrays with Tunable Wettability and Their Applications

Authors:A. Indrat Aria
Affilation:California Institute of Technology, US
Pages:149 - 152
Keywords:carbon nanotube, superhydrophobic, superhydrophilic, drag reduction, double layer capacitor
Abstract:A combination of UV/ozone treatment and vacuum-pyrolysis process that can be used for fine tuning the wetting properties of the CNTs is introduced. In contrast to the widely known wet-chemical methods the UV/ozone treatment is efficient, fast and does not use corrosive and dangerous chemicals, making the process more convenient and can be easily scaled up to industrial level. These superhydrophilic CNTs have a very high affinity to water such that they can be dispersed easily in aqueous solution and can be utilized as high performance electrochemical double layer capacitors. The vacuum-pyrolysis process, which typically performed at a moderate vacuum and temperature, can also be easily scaled up to industrial level since it does not involve complicated multi-step lithography and plasma treatment processes. All superhydrophobic CNTs exhibit extreme water repellent capability such that they have an extremely high static contact angle of 170° and a very low roll-off angle of 3°, which can be used for reducing hydrodynamic skin friction drag in water.
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