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Nano-level Material Processing by Multifunction Cavitation

[ Vol. 8 , Issue. 1 ]

Author(s):

Toshihiko Yoshimura*, Kumiko Tanaka and Naoto Yoshinaga   Pages 41 - 54 ( 14 )

Abstract:


Introduction: The fundamental characteristics of multifunction cavitation were investigated, and the photocatalytic performance of titanium oxide particles was found to be remarkably enhanced following treatment with this technique.

Method: In this work, ultrasonic irradiation of a waterjet during floating cavitation was used to generate microjets with hot spots. Hot working can be performed at the nanoscale on a material surface using this multifunction cavitation process, resulting in morphological changes and variations in the surface electrochemical characteristics. The relative extents of hot treatment by hot spots in the microjet and high pressure working of the material can be tuned by varying both the waterjet and ultrasonication power.

Result and Conclusion: The quantities of hydrogen and oxygen generated from titanium dioxide particles treated by multifunction cavitation in response to UV and visible light irradiation were remarkably increased compared to the amounts produced by particles treated by conventional water jet processing.

Keywords:

Multifunction cavitation, water jet cavitation, ultrasonic cavitation, mechanicalelectrochemical cavitation, photocatalyst, titanium oxide.

Affiliation:

Department of Mechanical Engineering, Tokyo University of Science, Yamaguchi, 1-1-1 Daigakudori, Sanyo-Onoda, Yamaguchi 756-0884, Department of Mechanical Engineering, Tokyo University of Science, Yamaguchi, 1-1-1 Daigakudori, Sanyo-Onoda, Yamaguchi 756-0884, Department of Mechanical Engineering, Tokyo University of Science, Yamaguchi, 1-1-1 Daigakudori, Sanyo-Onoda, Yamaguchi 756-0884

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