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Jun 22, 2017 - With this method, uniform titania nanotube arrays are produced at the inner surface of titanium tubular electrodes of 1000 mm in length...
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Large-Scale, Uniform and Superhydrophobic Titania Nanotubes at the Inner Surface of 1000-mm-Long Titanium Tubes Chengjie Xiang, Lidong Sun, Ye Wang, Guangchen Wang, Xiaoli Zhao, and Sam Zhang J. Phys. Chem. C, Just Accepted Manuscript • Publication Date (Web): 22 Jun 2017 Downloaded from http://pubs.acs.org on June 23, 2017

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The Journal of Physical Chemistry

Large-Scale, Uniform and Superhydrophobic Titania Nanotubes at the Inner Surface of 1000-mm-Long Titanium Tubes Chengjie Xiang,1 Lidong Sun,1,∗ Ye Wang,1 Guangchen Wang,1 Xiaoli Zhao,1 Sam Zhang2,∗

1

State Key Laboratory of Mechanical Transmission, School of Materials Science and

Engineering, Chongqing University, Chongqing 400044, PR China 2

School of Mechanical and Aerospace Engineering, Nanyang Technological University, 50

Nanyang Avenue, Singapore 639798, Singapore

ACS Paragon Plus Environment

1

The Journal of Physical Chemistry

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ABSTRACT

Large scale and mass production of uniform nanostructured materials have been a focusing 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 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 are 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