Preparation of Superoleophobic and Superhydrophobic Titanium Surfaces via an Environmentally Friendly Electrochemical Etching Method

Lu, Yao; Song, Jinlong; Liu, Xin; Xu, Wenji; Xing, Yingjie; Wei, Zefei

doi:10.1021/sc3000527

Cited by 112 publications

(74 citation statements)

References 28 publications

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“…21,22 Although significant progress has been achieved for membrane-based oil/water separation in the last few years, development of separation membranes for organic liquids is still highly limited because organic liquids usually possess a relatively lower surface tension than water. The difficulty in separation of organic liquid mixtures has increased because it is more difficult to build a superoleophobic [23][24][25][26][27][28][29] material than a superhydrophobic material. We recently proposed an oleophobicity-tunable TiO 2 nanofibrous membrane prepared by electrospinning, calcination and a subsequent chemical modification method that achieved immiscible organic liquids separation.…”

Section: Introductionmentioning

confidence: 99%

Separation of organic liquid mixture by flexible nanofibrous membranes with precisely tunable wettability

Hou

Wang

et al. 2016

NPG Asia Mater

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Separation of liquid mixtures, especially organic liquid mixtures, is widely used in industrial processes but still faces challenges with respect to separation in a high-efficiency, low-energy mode. In this work, we report a flexible wettability-tunable nanofibrous membrane composed of a high-performance fluoro-polymer as the matrix and fluorosilane as a surface energy regulator that can be successfully applied in immiscible organic liquid mixture separation. The separation is achieved by tuning the surface energy of a membrane to a value between the surface tensions of two organic liquids. Moreover, for use in different mixed liquid systems, we programmatically designed nanofibrous membranes with the proper surface energy that could intercept the relatively high surface tension liquid and allow the low surface tension liquid to pass through. These membranes are expected to become a competitive candidate for complex organic chemical product separation, resource recycling, and environmental protection. INTRODUCTIONLiquid mixtures of solvents or reactants are ubiquitously applied in processes in the petrochemical, textile printing, food and medical industries. These complex liquid mixtures often must be separated after reaction for the purpose of product purification, resource recycling or harmless discharge. 1 Traditional liquid separation methods such as distillation and separation have exposed many drawbacks, including high-energy consumption, low flux and low efficiency, that dramatically increase the separation time and cost. 2 Therefore, challenges remain for the development of separation processes of organic liquid mixtures that are efficient, allow high throughput and conserve energy. Among various separation approaches, the membrane separation technique has been extensively proven as a high throughput and energy-efficient choice. [3][4][5] Over the past decade, various membranes with special wettability properties have been successfully prepared and have exhibited excellent performance in oil/water separation. The mechanisms of membrane separation are based on exact opposite wettabilities toward oil and water, including superhydrophobic/superoleophilic membranes 3,5-8 or superhydrophilic/superoleophobic membranes. 9-15 For example, superhydrophobic/oleophilic membranes have been prepared from various materials, including metals, polymers or even clothes and filter papers, that could intercept water and allow oil to pass through. [16][17][18][19][20] In addition, researchers have gained inspiration from oil-contaminantfree fish skin to fabricate oil-repellent hydrogel membranes that could separate oil from water. 21,22 Although significant progress has been achieved for membrane-based oil/water separation in the last few years, development of separation membranes for organic liquids is still highly limited because organic liquids usually possess a relatively lower surface tension than water. The difficulty in separation of organic liquid mixtures has increased because it is more difficult to build a super...

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Section: Introductionmentioning

confidence: 99%

Separation of organic liquid mixture by flexible nanofibrous membranes with precisely tunable wettability

Hou

Wang

et al. 2016

NPG Asia Mater

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“…Low dimensional materials, such as TiO 2 nanowire, TiO 2 , graphene oxide, and Pb nanoparticle have been coating on the surface for creating superhydrophobicity using drop‐coating process, electrospinning, and immersion method . Recently many literatures reported surface treatments for modifying titanium surface to attain water contact angle greater than 160°, as listed in Table . Comparatively, in this study, the hierarchical structure has nanoscale strips with 200 nm wide, which only provides water contact angle slightly above 150°.…”

Section: Resultsmentioning

confidence: 86%

Fabrication of superhydrophobic titanium surfaces by anodization and surface mechanical attrition treatment

Tsai

Chen²,

Ou³

et al. 2018

Int J Applied Ceramic Tech

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A superhydrophobic surface of titanium was fabricated by anodization in sodium chloride solution followed by immersion in perfluorodecyltriethoxysilane. The surface characteristics of the anodic film (morphology, composition, microstructure, and adhesion) were investigated by scanning electron microscopy, transmission electron microscopy, X‐ray photoelectron spectroscopy, and scratch testing. The anodic film was comprised of TiO2 and TiCl3 with a thickness of 50 nm. The anodized titanium surface exhibited a hierarchical structure, which consisted of a microscale horn structure with a nanoscale strip‐overlay. This structure provided superhydrophobicity (water contact angle: 151.9° and sliding angle: 3°) following the immersion process. Furthermore, coverage of the hierarchical structure on the anodized titanium surface was improved by performing surface mechanical attrition treatment (SMAT) to grain‐refine titanium surface which was then anodized and it enhanced a slightly increased water contact angle. The thickness (200 nm) of the anodic film on the SMAT‐pretreated titanium surface was much higher than that on the titanium surface (50 nm). This resulted from a large number of grain boundaries on the surface serving as a fast diffusion path during anodization. However, the adhesion of the SMAT‐and‐anodized film was worse than that formed by anodization only. This is due to a large number of pores within the SMAT‐and‐anodized film.

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“…Contact angles of both water and oil above 150° are known as superamphiphobic surfaces, which are more likely to be used for water/oil proofing in an oily environment in comparison to superhydrophobic surfaces . Superamphiphobic surfaces have attracted increasingly interest owing to their wide range of applications.…”

Section: Introductionmentioning

confidence: 99%

A Cycle‐Etching Approach Toward the Fabrication of Superamphiphobic Stainless Steel Surfaces With Excellent Anticorrosion Properties

et al. 2017

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In this paper, a facile approach is developed for preparing superamphiphobic surfaces with excellent anticorrosion properties on 304 stainless steel (SS) substrates. This proposed methodology involves fabrication of micro/nano-scale binary structures on SS substrates by a cycle-etching approach (cycles of hydrofluoric acid etching and ultrasonic cleaning), and final fluoroalkylsilane modification. Wettability measurements reveal that the fabricated SS surfaces become super-repellent toward water and peanut oil. By varying the times of cycle-etching, the authors compare the relationship between morphological change and wettability. The potentiodynamic polarization curves and electrochemical impedance spectroscopy suggest that the fabricated SS surfaces have superior corrosion resistance.

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Preparation of Superoleophobic and Superhydrophobic Titanium Surfaces via an Environmentally Friendly Electrochemical Etching Method

Cited by 112 publications

References 28 publications

Separation of organic liquid mixture by flexible nanofibrous membranes with precisely tunable wettability

Separation of organic liquid mixture by flexible nanofibrous membranes with precisely tunable wettability

Fabrication of superhydrophobic titanium surfaces by anodization and surface mechanical attrition treatment

A Cycle‐Etching Approach Toward the Fabrication of Superamphiphobic Stainless Steel Surfaces With Excellent Anticorrosion Properties

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