Wang, Z and Koratkar, N and Ci, Lijie and Ajayan, Pulickel M. (2007) Combined micro-/nanoscale surface roughness for enhanced hydrophobic stability in carbon nanotube arrays. APPLIED PHYSICS LETTERS, 90 (14).
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Extreme water repellency is greatly desired for anticontamination and self-cleaning applications. Aligned multiwalled carbon nanotube arrays exhibit superhydrophobic behavior but suffer from poor hydrophobic stability and contact angle hysteresis. In this work the authors selectively grow multiwalled nanotubes onto a patterned substrate and engineer a novel high aspect ratio architecture which combines a micro- and a nano-scale roughness structure. While there is no significant difference in the static contact angle of the patterned and uniform nanotube arrays, dynamic measurements indicate a dramatic increase in hydrophobic stability for the patterned array caused by entrapped air pockets which prevent Cassie to Wenzel state transition. (c) 2007 American Institute of Physics.
|Uncontrolled Keywords:||carbon nanotubes; surface roughness; nanotechnology; contact angle|
|Subjects:||Material Science > Functional and hybrid materials|
Material Science > Nanofabrication processes and tools
|Deposited By:||Lesley Tobin|
|Deposited On:||28 Nov 2008 16:18|
|Last Modified:||19 Feb 2009 10:46|
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