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Appl. Sci. 2018, 8(7), 1059; https://doi.org/10.3390/app8071059

Magnetic Nanofluid Droplet Impact on an AAO Surface with a Magnetic Field

Department of Mechanical Engineering, Chung Yuan Christian University, Taoyuan 32023, Taiwan
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Received: 31 May 2018 / Revised: 23 June 2018 / Accepted: 27 June 2018 / Published: 29 June 2018
(This article belongs to the Special Issue Selected Papers from the 2017 International Conference on Inventions)
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Abstract

This paper presents an experimental study on the impact of magnetic nanofluid droplets on aluminum sheet surfaces subjected to a magnetic field. A magnetic nanofluid was prepared by synthesizing Fe3O4 nanoparticles and coating amounts of oleic acid surfactant in deionized water. The wettability of an alumina sheet was first changed by using a phosphoric acid (H3PO4) solution to perform the first anodic oxidation process. A contact angle meter and a high-speed camera were then, respectively, used to capture the static contact angle of magnetic nanofluid droplets and their dynamic characteristics during impact on the surface with/without anodic oxidation process. The results of the static contact angle showed that a more hydrophilic surface could be obtained after the sheet was processed. The dynamic images showed that the processed surface exhibited a slightly greater degree of adhesion between the liquid and solid without a magnetic field. The effect of AAO surface topography can be significant under the action of an external magnetic field. View Full-Text
Keywords: magnetic fluids; droplet impact dynamics; dynamic magnetowetting; anodic aluminum oxide surfaces magnetic fluids; droplet impact dynamics; dynamic magnetowetting; anodic aluminum oxide surfaces
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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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Chien, Y.-C.; Weng, H.C. Magnetic Nanofluid Droplet Impact on an AAO Surface with a Magnetic Field. Appl. Sci. 2018, 8, 1059.

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