Journal
LANGMUIR
Volume 30, Issue 23, Pages 6780-6790Publisher
AMER CHEMICAL SOC
DOI: 10.1021/la501360t
Keywords
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Funding
- The Office of Naval Research [N00014-11-1-0031]
- The Fletcher-Jones Foundation [9900600]
- Charyk Laboratory for Bioinspired Design at the California Institute of Technology
- Kavli Nanoscience Institute at the California Institute of Technology
- Molecular Materials Research Center of the Beckman Institute at the California Institute of Technology
- Analytical Facility Division of Geological and Planetary Sciences of the California Institute of Technology
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The physicochemical and droplet impact dynamics of superhydrophobic carbon nanotube arrays are investigated. These superhydrophobic arrays are fabricated simply by exposing the as-grown carbon nanotube arrays to a vacuum annealing treatment at a moderate temperature. This treatment, which allows a significant removal of oxygen adsorbates, leads to a dramatic change in wettability of the arrays, from mildly hydrophobic to superhydrophobic. Such change in wettability is also accompanied by a substantial change in surface charge and electrochemical properties. Here, the droplet impact dynamics are characterized in terms of critical Weber number, coefficient of restitution, spreading factor, and contact time. Based on these characteristics, it is found that superhydrophobic carbon nanotube arrays are among the best water-repellent surfaces ever reported. The results presented herein may pave a way for the utilization of superhydrophobic carbon nanotube arrays in numerous industrial and practical applications, including inkjet printing, direct injection engines, steam turbines, and microelectronic fabrication.
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