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    Several surfaces with special wettability: Influence on spreading and motion of W/O emulsion droplets

    Year: 2018

    Journal: J. Dispersion Sci. Technol., Volume 39, page 241–249

    Authors: Han, Yunrui; He, Limin; Luo, Xiaoming; Huang, Xin; Shi, Kaiyue

    Organizations: National Natural Science Foundation of China [51574273]; Fundamental Research Funds for the Central Universities [16CX06001A]; Graduate Innovation Funds Project in China University of Petroleum-East China [YCXJ2016069]; Shandong Provincial Key Laboratory of Oil & Gas Storage and Transportation Safety; Qingdao Key Laboratory of Circle Sea Oil & Gas Storage and Transportation Technology

    Keywords: Droplets motion; droplets spreading; micro analysis; special wettability; surface modification

    Physical and chemical modifications were made on the surface of the aluminum sheet to change the surface properties and superhydrophobic-hydrophilic wettability gradient surface was made on the perspex surface by using microstructure-pattering technique and self-assembled-monolayer method. By using high-speed video camera system and optical tensiometer, this paper discusses the influence of special surfaces with different wettability on spreading and motion of water, oil, and W/O emulsion droplets both experimentally and theoretically. In addition, the paper also discusses the influence of the superhydrophobic-hydrophilic wettability gradient on fluidity of W/O emulsion droplets and the coalescence process of droplets. The results showed that the contact angle of W/O emulsion droplets on the modified surfaces was related to the water and oil distribution at the three-phase line. On the wettability gradient surface, the droplet moved spontaneously when the droplet was located at the junction of the gradient. A quasi-steady theoretical model was used to analyze the driving and resistant forces acting on a droplet to improve the understanding of the self-transport behavior of the droplets. [GRAPHICS] .
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