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Micromachines 2016, 7(11), 203;

UV Light–Induced Aggregation of Titania Submicron Particles

Department of Mechanical & Aerospace Engineering, Old Dominion University, Norfolk, VA 23529, USA
Author to whom correspondence should be addressed.
Academic Editors: Xiangchun Xuan and Shizhi Qian
Received: 30 September 2016 / Revised: 28 October 2016 / Accepted: 2 November 2016 / Published: 8 November 2016
(This article belongs to the Special Issue Micro/Nano-Chip Electrokinetics)
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In this study, aggregation of TiO2 (rutile and anatase) submicron particles in deionized (DI) water under ultra-violet (UV) light irradiation was investigated. While no aggregation was observed in the dark, rutile and anatase submicron particles started aggregating upon application of UV light and ceased aggregation in about 2 and 8.4 h, respectively. It has been demonstrated that UV light directly mitigated the particle mobility of TiO2, resulting in a neutralization effect of the Zeta potential. It was also observed that rutile particles aggregated much faster than anatase particles under UV radiation, indicating that the Zeta potential of as-prepared rutile is less than that of anatase in deionized (DI) water. In addition, the interaction energy of rutile and anatase particles was simulated using the Derjaguin–Landau–Verwey–Overbeek (DLVO) model. The results showed a significant reduction of barrier energy from 118.2 kBT to 33.6 kBT for rutile and from 333.5 kBT to 46.1 kBT for anatase, respectively, which further validated the remarkable influence of UV irradiation on the aggregation kinetics of rutile and anatase submicron particles. This work presents a further understanding of the aggregation mechanism of light-controlled submicron particles and has a promising potential application in environmental remediation. View Full-Text
Keywords: Derjaguin–Landau–Verwey–Overbeek (DLVO); Zeta potential; rutile; anatase; electrokinetics; mobility Derjaguin–Landau–Verwey–Overbeek (DLVO); Zeta potential; rutile; anatase; electrokinetics; mobility

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This is an open access article distributed under the Creative Commons Attribution License which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited. (CC BY 4.0).

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Zhou, C.; Bashirzadeh, Y.; Bernadowski, T.A.; Zhang, X. UV Light–Induced Aggregation of Titania Submicron Particles. Micromachines 2016, 7, 203.

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