An alternative fabrication of underoil superhydrophobic or underwater superoleophobic stainless steel meshes for oil-water separation: Originating from one-step vapor deposition of polydimethylsiloxane

et al. 2020

Ind. Eng. Chem. Res.

A series of oil/water separation membranes with tunable surface wettability based on poly(ionic liquid)s (PILs) were prepared via a facile one-step photopolymerization of N-vinylimidazolium ionic liquids and divinylbenzene on meshes. The wettability of PIL-based membranes (PILMs) was adjusted by the structures of PILs, specifically the alkyl chain length of imidazolium (butyl and octyl) and anion species (acrylic anion, Br–, and PF6 –). Tunability of wettability resulted in the hydrophilic or hydrophobic property of PILMs. The hydrophilic poly(1-vinyl-3-butylimidazolium acrylate)-based membrane (PILM-1) transported water and intercepted oil, while the hydrophobic poly(1-vinyl-3-octylimidazolium hexafluorophosphate)-based membrane (PILM-5) removed oil and rejected water. The two membranes with opposite wettability showed excellent oil/water separation efficiency (above 99%) in batch processes. Continuous oil/water separation was also achieved by assembling PILM-1 and PILM-5 on the fabricated devices. A T-type device could separate various oil/water mixtures continuously, and a tank-type device could separate dispersed oil/water mixtures, with a handling capacity of 46 L within 12 h.

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Poly(ionic liquid)-Coated Meshes with Opposite Wettability for Continuous Oil/Water Separation

Deng

et al. 2020

Ind. Eng. Chem. Res.

“…Fig. 12 showed the separation efficiencies of superhydrophobic stainless steel surfaces obtained from different methods [48] , [52] , [53] , [54] . It was indicated that the separation efficiency of the as-prepared samples ranked among the highest values reported before.…”

Section: Resultsmentioning

confidence: 99%

Ultrasonic assisted rapid preparation of superhydrophobic stainless steel surface and its application in oil/water separation

Ultrasonics Sonochemistry

Wang

et al. 2021

“…Inspired by the ability of kingfishers to fly in heavy rain without wetting their feathers, Zheng et al [ 76 ] prepared superhydrophobic surfaces with a contact angle of 155° and a roll angle of 3° on a copper base by wire electrical discharge machining and chemical vapor deposition. Wen et al [ 77 ] used liquid state polydimethylsiloxane (PDMS) one-step vapor deposition method to uniformly cover the circular oligomer agglomerated by irregular nanoparticles on the surface of stainless steel and prepared a superhydrophobic surface with a static contact angle of 154° and a rolling angle of 0°. Wang et al [ 78 ] prepared a hydrophobic template by laser etching on the surface of a 6061 aluminum alloy tube.…”

Section: Fabrication Of Superhydrophobic Surfacesmentioning

confidence: 99%

A Review of Recent Advances in Superhydrophobic Surfaces and Their Applications in Drag Reduction and Heat Transfer

Yang

et al. 2021

Nanomaterials

Inspired by the superhydrophobic properties of some plants and animals with special structures, such as self-cleaning, water repellent, and drag reduction, the research on the basic theory and practical applications of superhydrophobic surfaces is increasing. In this paper, the characteristics of superhydrophobic surfaces and the preparation methods of superhydrophobic surfaces are briefly reviewed. The mechanisms of drag reduction on superhydrophobic surfaces and the effects of parameters such as flow rate, fluid viscosity, wettability, and surface morphology on drag reduction are discussed, as well as the applications of superhydrophobic surfaces in boiling heat transfer and condensation heat transfer. Finally, the limitations of adapting superhydrophobic surfaces to industrial applications are discussed. The possibility of applying superhydrophobic surfaces to highly viscous fluids for heat transfer to reduce flow resistance and improve heat transfer efficiency is introduced as a topic for further research in the future.