Chemical and Physical Pathways for the Preparation of Superoleophobic Surfaces and Related Wetting Theories

Bellanger, Hervé; Darmanin, Thierry; Givenchy, Elisabeth Taffin de

doi:10.1021/cr400169m

Cited by 471 publications

(344 citation statements)

References 225 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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“…On the other hand, loading of EO 3 -C 60 in Tecoflex resulted in a significant decrease in water contact angle accompanied with a linear increase surface roughness to a greater degree than C 60 . Therefore, comparison of contact angle and surface roughness indicates that surface roughness plays an insignificant role in the water contact angle, despite previous evidence to the contrary [39]. Thus the affect that additive loading has on water contact angle must result from the additive's effect on the surface energy of Tecoflex, instead of imparted surface roughness.…”

Section: Additive-polymer Compatibilitymentioning

confidence: 78%

Self-Cleaning Photocatalytic Polyurethane Coatings Containing Modified C60 Fullerene Additives

et al. 2014

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Surfaces are often coated with paint for improved aesthetics and protection; however, additional functionalities that impart continuous self-decontaminating and self-cleaning properties would be extremely advantageous. In this report, photochemical additives based on C 60 fullerene were incorporated into polyurethane coatings to investigate their coating compatibility and ability to impart chemical decontaminating capability to the coating surface. C 60 exhibits unique photophysical properties, including the capability to generate singlet oxygen upon exposure to visible light; however, C 60 fullerene exhibits poor solubility in solvents commonly employed in coating applications. A modified C 60 containing a hydrophilic moiety was synthesized to improve polyurethane compatibility and facilitate segregation to the polymer-air interface. Bulk properties of the polyurethane films were analyzed to investigate additive-coating compatibility. Coatings containing photoactive additives were subjected to self-decontamination challenges against representative chemical contaminants and the effects of additive loading concentration, light exposure, and time on chemical decontamination are reported. Covalent attachment of an ethylene glycol tail to C 60 improved its solubility and dispersion in a hydrophobic polyurethane matrix. Decomposition products resulting from oxidation were observed in addition to a direct correlation between additive loading concentration and decomposition of surface-residing contaminants. The degradation pathways deduced from contaminant challenge byproduct analyses are detailed.

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“…19), which repel no only water but also organic oils, which is an important technological task [62][63][64][65].…”

Section: Wetting Of Hierarchical Reliefs: Approach Of Herminghausmentioning

confidence: 99%

Physics of solid–liquid interfaces: From the Young equation to the superhydrophobicity (Review Article)

Bormashenko

2016

Low Temperature Physics

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The state-of-art in the field of physics of phenomena occurring at solid/liquid interfaces is presented. The notions of modern physics of wetting are introduced and discussed including: the contact angle hysteresis, disjoining pressure and wetting transitions. The physics of low temperature wetting phenomena is treated. The general variational approach to interfacial problems, based on the application of the transversality conditions to variational problems with free endpoints is presented. It is demonstrated that main equations, predicting contact angles, namely the Young, Wenzel and Cassie-Baxter equations arise from imposing the transversality conditions on the appropriate variational problem of wetting. Recently discovered effects such as superhydrophobicity, the rose petal effect and the molecular dynamic of capillarity are reviewed.

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Chemical and Physical Pathways for the Preparation of Superoleophobic Surfaces and Related Wetting Theories

Cited by 471 publications

References 225 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

Self-Cleaning Photocatalytic Polyurethane Coatings Containing Modified C60 Fullerene Additives

Physics of solid–liquid interfaces: From the Young equation to the superhydrophobicity (Review Article)

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