Large-Scale, Uniform, and Superhydrophobic Titania Nanotubes at the Inner Surface of 1000 mm Long Titanium Tubes

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State Key Laboratory of Mechanical Transmission, School of Materials Science and Engineering, Chongqing University, Chongqing 400044, PR China
School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798, Singapore
*E-mail: [email protected] (L. Sun).
*E-mail: [email protected] (S. Zhang).
Cite this: J. Phys. Chem. C 2017, 121, 28, 15448–15455
Publication Date (Web):June 22, 2017
Copyright © 2017 American Chemical Society
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Large-scale and mass production of uniform nanostructured materials has been a growing challenge. Anodic titania nanotubes have been widely employed in various applications, which are usually demonstrated with limited size and planar geometry. In this study, a coaxial electrochemical anodization approach is explored and reported. With this method, uniform titania nanotube arrays are produced at the inner surface of titanium tubular electrodes of 1000 mm in length and 10 mm in diameter, in good contrast to the nonuniform nanotubes attained with a conventional anodizing scheme. Such an approach is cost-effective and energy-efficient. It is also capable of processing other valve metals possible for anodization and even longer tubular substrates. The wetting property of the resulting nanotube arrays is further tailored, with a maximum contact angle of 166° for water and 163° for glycerol, exhibiting a superhydrophobic feature. An equation is derived to compute the intrinsic contact angle of a spherical droplet on an asymmetric tubular substrate, based on measurable apparent contact angle, droplet radius, and tube radius. Such a superhydrophobic tube with a sliding angle of <3° is promising to be applied in drag reduction, condensation heat transfer, microfluidics, etc.

Supporting Information

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The Supporting Information is available free of charge on the ACS Publications website at DOI: 10.1021/acs.jpcc.7b03124.

  • Figure S1, cross-sectional FESEM images; Figure S2, FESEM images of the microstructure (PDF)

  • Tailoring the wetting behaviors of the inner tube surface with different patterns (MPG)

  • Roll-off behavior of a water droplet at the untreated inner surface cut from a tubular substrate (MPG)

  • Roll-off behavior of a water droplet at the inner superhydrophobic surface cut from a tubular substrate (MPG)

  • Roll-off behavior of a glycerol droplet at the inner superhydrophobic surface cut from a tubular substrate (MPG)

  • Water droplet rolling back and forth at the inner superhydrophobic surface cut from a tubular substrate (MPG)

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