Durable, scalable, and tunable omniphobicity on stainless steel mesh for separation of low surface tension liquid mixtures

Kim, Aeree; Lee, Chan; Kim, Joon Won

doi:10.1016/j.surfcoat.2018.03.053

Cited by 9 publications

(2 citation statements)

References 29 publications

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“…Recent developments in omniphobic surfaces have demonstrated wetting resistance against both water and low surface tension liquids. − This presents a promising approach for expanding the range of ethanol concentrations that can be effectively separated by MD. The two most critical factors influencing surface omniphobicity are surface energy and roughness. ,,− Surface energy can be reduced through surface fluorination via silanization and the coating of fluoroalkyl molecules.…”

Section: Introductionmentioning

confidence: 99%

Omniphobic, Bilayer Carbon Nanotube-Immobilized Fluorinated (FAS) Membranes for Bioethanol Recovery at High Concentrations via Membrane Distillation

Paul,

Roy,

Mitra

2024

Energy Fuels

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Thermal distillation is the traditional method of choice for recovering ethanol from the diluted fermentation broth. However, this conventional approach incurs significant energy and capital expenses. While membrane distillation (MD) has shown promise in reducing costs, traditional MD membranes can only handle relatively low feed ethanol concentrations, which limits the range of ethanol purification. In this paper, we present the development of novel omniphobic membranes with antiwetting properties for separating relatively high concentrations of bioethanol via MD, which has not been achievable using conventional membranes. The bilayer membrane structure consists of a coating of carbon nanotubes (CNTs) with poly(vinylidene fluoride)-cohexafluoropropylene (PVDF-HFP) and a second layer comprising a fluorinated alkyl silane (FAS), namely, 1H,1H,2H,2H--Perfluorooctyltriethoxysilane. The FAS-coated carbon nanotube-immobilized membranes (FAS-CNIM) exhibited excellent omniphobic characteristics, with contact angles of 155°for water and 125°for 50% aqueous ethanol, which were 29 and 92.3% higher than those of a conventional poly(tetrafluoroethylene) (PTFE) membrane, respectively. The study evaluated ethanol vapor flux, separation factor, mass transfer coefficient, and permeate separation index, all of which were superior for FAS-CNIM. Ethanol flux reached as high as 5.53 kg/m 2 •h, and the separation factor reached 10.78. The FAS-CNIM successfully prevented membrane wetting up to 40% ethanol concentration with activated diffusion on the CNT surface playing a key role. The results show a remarkable 173.37% increase in ethanol enrichment and a 70% improvement in the separation factor compared to that of the control FAS membrane without the CNT coating.

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Section: Introductionmentioning

confidence: 99%

Omniphobic, Bilayer Carbon Nanotube-Immobilized Fluorinated (FAS) Membranes for Bioethanol Recovery at High Concentrations via Membrane Distillation

Paul,

Roy,

Mitra

2024

Energy Fuels

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“…Fibrous networks constitute a core class of porous media and include materials such as non-woven fabrics, electrospun mats, and papers. Their highly desired mechanical strength, flexibility, permeable structure, and scalable manufacturing have led to applications in batteries, apparel, functional fabrics, liquid–liquid separations, and fluid barriers. − Understanding the wetting behavior of these materials, especially their wetting barrier properties, is key to successfully applying design principles and has been a key thrust of research. − …”

Section: Introductionmentioning

confidence: 99%

Liquid Repellence of Phobic Fiber Networks

2022

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The wetting behavior of fiber networks, which are central to many research and industrial applications, can be difficult to predict accurately owing to their complex, heterogeneous structure. The cylindrical pore model, widely used to interpret and predict the forced wetting of hydrophobic porous materials, often does not yield correct results when working with fibrous networks like paper substrates and non-woven fabrics. This is because these materials exhibit variation in pore size, fiber length, and fiber diameter, as well as a reentrant pore geometry. Quantitative prediction of the critical wetting resistance of hydrophobized papers to arbitrary entrant liquids requires a more sophisticated analytical approach that considers this unique fibrous structure and the effect of stochastic variations within the pore matrix. In this work, we directly measure the critical breakthrough pressure for different porous substrates across various wetting entrant liquids. To isolate the effects of the structure and stochastics on critical wetting behavior of fibrous networks, we analyze additional materials strategically chosen for their subsets of structural features. Ultimately, we formulate a method that demonstrates physical reasonableness, numerical accuracy, and the ability to elucidate the effects of pore size, pore size distribution, fiber diameter, fiber diameter distribution, surface wettability, and liquid surface tension on critical breakthrough pressure of liquids through hydrophobic fibrous networks.

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Superhydrophobic Coatings Applications

Parsimehr

Ershad‐Langroudi

2020

Polymer Coatings

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Durable, scalable, and tunable omniphobicity on stainless steel mesh for separation of low surface tension liquid mixtures

Cited by 9 publications

References 29 publications

Omniphobic, Bilayer Carbon Nanotube-Immobilized Fluorinated (FAS) Membranes for Bioethanol Recovery at High Concentrations via Membrane Distillation

Omniphobic, Bilayer Carbon Nanotube-Immobilized Fluorinated (FAS) Membranes for Bioethanol Recovery at High Concentrations via Membrane Distillation

Liquid Repellence of Phobic Fiber Networks

Superhydrophobic Coatings Applications

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