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Electrophoretic Deposition of Titania Nanoparticles in Different Alcohols: Kinetics of Deposition

Authors

  • Morteza Farrokhi-Rad,

    1. Materials Science and Engineering Department, Sharif University of Technology, Tehran, PO Box 11356–8639, Iran
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  • Mohammad Ghorbani

    Corresponding author
    1. Materials Science and Engineering Department, Sharif University of Technology, Tehran, PO Box 11356–8639, Iran
    2. Institute For Nanoscience and Nanotechnology, Sharif University of Technology, Tehran, Iran
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  • R. Moreno—contributing editor

  • Based in part on the thesis submitted by M. Farrokhi-rad for the M.Sc. degree in materials engineering, Sharif University of Technology, Tehran, Iran, 2009.

†Author to whom correspondence should be addressed. e-mail: ghorbani@sharif.edu

Abstract

The suspension of titania nanoparticles in different alcohols (methanol, ethanol, and butanol) was prepared and triethanolamine (TEA) was used as a dispersant. The suspensions were characterized by different tests such as sedimentation, zeta potential, and Fourier transform infrared spectroscopy. The electrophoretic deposition (EPD) was performed at various voltages and times. EPD from butanolic suspension (0.8 g/L TEA) showed the slowest kinetics, because of the low electrophoretic mobility of titania nanoparticles in it (2.40 × 10−5 cm2·(V·s)−1). Also, it was observed that at low voltages (5, 10, and 20 V), the EPD kinetics from methanolic suspension (0 g/L TEA) was the fastest; however, with deposition voltage, the weights of deposits formed from methanolic (0 g/L TEA) and ethanolic (2.4 g/L TEA) suspensions approached each other so that at (30 V, t≥240 s), (40 V, t≥120 s), and (60 V, t≥80 s) the weight of deposits formed from the ethanolic suspension was higher. These interesting observations were interpreted by the values of the electrophoretic mobility of titania nanoparticles in methanolic (−7.78 × 10−5 cm2·(V·s)−1) and ethanolic (4 × 10−5 cm2·(V·s)−1) suspensions as well as the rate of increase in the electrical resistance of the deposits formed from these suspensions.

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