Ultra-robust Superhydrophobic/superoleophilic Stainless Mesh Coated by PTFE/SiO 2 for Oil/water Separation
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MRS Advances © 2018 Materials Research Society DOI: 10.1557/adv.2018.604
Ultra-robust Superhydrophobic/superoleophilic Stainless Mesh Coated by PTFE/SiO2 for Oil/water Separation Chaolang Chen, Ding Weng, Awais Mahmood, Jiadao Wang State Key Laboratory of Tribology, Tsinghua University, Beijing 100084, China
Abstract
In this study, a superhydrophobic and superoleophilic stainless mesh coated with polytetrafluoroethylene/silicon dioxide (PTFE/SiO2) was fabricated through electrostatic selfassembly method followed by sintering treatment. The PTFE was utilized to construct lowsurface-energy surface and the SiO2 nanoparticles were added to enhance its surface roughness. The as-prepared stainless mesh exhibited desirable superhydrophobicity and superoleophilicity with a water contact angle of 152° and oil contact angle of 0°. The coated stainless mesh could separate a variety of oil/water mixtures with high efficiency and it also exhibited good recyclability. Moreover, the corrosion-resistance of stainless mesh was greatly improved by coating it with PTFE. The thermogravimetric analysis (TGA) measurements showed that the coated mesh could withstand high temperature of up to 430°C indicating excellent thermal-resistance. It is believed that this ultra-robust stainless mesh would have significant potential applications in industry.
INTRODUCTION In the past decades, the separation of oil/water contamination has become one of most important and urgent global environmental problem [1-4]. The traditional methods including skimmers, air flotation and centrifugation are usually employed to separate oil and water. Nevertheless, those techniques are low-efficient, expensive and complicated, which greatly limit their development and usage in industry [5-7]. Currently, superhydrophobic/superoleophilic materials have attracted increasing attention because of their advantages of high separation capacity, high selectivity, simplicity and cost-efficiency [8-10]. For example, fluorinated alkyl silane/TiO2 modified fabric [11], PDMS-SiO2 coated PET membrane [12], SiO2-TMS modified PVDF membrane [13] and so on, have been developed and successfully applied
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for oil/water separation. However, most of the aforementioned superhydrophobic and superoleophilic surfaces would deteriorate their superhydrophobic performance when used in harsh environment such as strong corrosive and high temperature, thus limiting their applications in real oil/water separation. Therefore, it is of significance to develop superhydrophobic materials with excellent robustness which can be produced by a simple and cost-efficient method. PTFE is considered to be a desirable candidate to construct robust superhydrophobic surface due to its intrinsic hydrophobicity, chemical and thermal stability [14-16]. In our previous papers
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