Wetting Behaviors of an Underwater Oil Droplet on Structured Surfaces
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Wetting Behaviors of an Underwater Oil Droplet on Structured Surfaces Shuai Chen, Jiadao Wang and Darong Chen MRS Advances / Volume 1 / Issue 10 / January 2016, pp 667 - 673 DOI: 10.1557/adv.2016.168, Published online: 01 March 2016
Link to this article: http://journals.cambridge.org/abstract_S2059852116001687 How to cite this article: Shuai Chen, Jiadao Wang and Darong Chen (2016). Wetting Behaviors of an Underwater Oil Droplet on Structured Surfaces. MRS Advances, 1, pp 667-673 doi:10.1557/adv.2016.168 Request Permissions : Click here
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MRS Advances © 2016 Materials Research Society DOI: 10.1557/adv.2016.168
Wetting Behaviors of an Underwater Oil Droplet on Structured Surfaces Shuai Chen, Jiadao Wang and Darong Chen State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China ABSTRACT In this study, the wetting behaviors of an underwater oil droplet on structured surfaces were investigated using molecular dynamics simulations and experiments. The wetting states and contact angles of the underwater oil droplet on different hydrophobic surfaces were simulated. The simulation results showed that there were three kinds of equilibrium states on the pillar surfaces: the Wenzel, cross, and Cassie states. Moreover, the equilibrium state of the underwater oil droplet transformed from a Wenzel to Cassie state when the water contact angle decreased. The contact angle of the underwater oil droplet increased as the water contact angle decreased. Furthermore, the wetting behaviors of the underwater oil droplet on rough polytetrafluoroethylene and silicon surfaces were studied in experiments. The experimental results also indicated that the contact angle of the underwater oil droplet increased as the water contact angle decreased, which corresponded well with the simulation results. INTRODUCTION Wastewater containing an emulsified oil/water mixtures has become one of the most urgent global environmental problems in many industrial processes such as petrochemical, textile, food, steel, and metal finishing1-4. The direct discharge of wastewater harms the environment and people’s health5. The separation of emulsified oil/water mixtures is always difficult and poses a worldwide challenge6. Currently, hydrophobic/oleophilic absorbent materials and filtration membranes are frequently used in practical applications because of their environmental advantages, simplicity, and highly inefficient properties7-10. However, they suffer from problems that include pore clogging and surface fouling by oil. Therefore, the development of an advanced material that can selectively absorb water and completely repel oil is highly desirable. The underwater superoleophobic phenomenon provides an opportunity to design a surface with high water affinity and low oil adhesion11. Studying the wetting mechanism of an underwater o
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