Nano Archive

Combined micro-/nanoscale surface roughness for enhanced hydrophobic stability in carbon nanotube arrays

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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Abstract

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.

Item Type:Article
Uncontrolled Keywords:carbon nanotubes; surface roughness; nanotechnology; contact angle
Subjects:Material Science > Functional and hybrid materials
Material Science > Nanofabrication processes and tools
ID Code:283
Deposited By:Lesley Tobin
Deposited On:28 Nov 2008 16:18
Last Modified:19 Feb 2009 10:46

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