Superhydrophobic and Superoleophilic PVDF Membranes for Effective Separation of Water‐in‐Oil Emulsions with High Flux

Zhang, Wenbing; Shi, Zhun; Zhang, Feng; Liu, Xia; Jin, Jian; Jiang, Lei

doi:10.1002/adma.201204520

Cited by 1,027 publications

(590 citation statements)

References 38 publications

(12 reference statements)

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“…The non-covalent interactions between GO (C 47 H 38 O 22 ) and asphaltene molecules (modified Yen model [24]) were performed with the ORCA-3.0.3 program package using the dispersion corrected BLYP-D3 functional together with the double-f Def2-SVP basis set. The geometries of GO, asphaltenes and GO-asphaltene interaction pair were optimized in vacuum.…”

Section: Quantum Chemical Calculationsmentioning

confidence: 99%

“…For example, anchoring the MNPs (c-Fe 3 O 4 and c-Fe 2 O 3 ) on host materials would endow them with excellent magnetism for magnetic separation. This strategy has been successfully used to separate host materials from the complex mixtures, such as the biomaterials [20] including cell, bacteria, protein, DNA, wastewater [21] and emulsions [19,22].…”

Section: Introductionmentioning

confidence: 99%

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Recyclable magnetic graphene oxide for rapid and efficient demulsification of crude oil-in-water emulsion

Liu

Wang

et al. 2017

Fuel

127

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h i g h l i g h t sThe M-GO was a high efficiency demulsifier which could be reused for 6-7 times. The non-covalent interaction analysis proved that p-p and r-p interactions between GO materials and asphaltene molecules are the major driven forces for demulsification. Graphene oxide (GO) nanosheets have been experimentally proved to be a highly efficiency, rapid and universal demulsifier to break up the crude oil-in-water emulsion and/or the emulsified oily waste water in our previous study. To recycle the GO nanosheets and avoid the possible contamination of GO for crude oil, in this work, the magnetic graphene oxide (M-GO) was successfully synthesized and used for separating oil/water emulsions. Demulsification tests indicated that M-GO could separate the oil/water emulsions within a few minutes and recycle 6-7 times without losing its demulsification capability. The residual oil content in the separated water was as low as $10 mg/L, corresponding to a demulsification efficiency of 99.98% at an optimal dosage. Quantum chemical calculation results indicated that the p-p/r-p interactions between GO materials and asphaltene molecules are the major driven forces for the high demulsification performance of M-GO nanosheets. This work not only provides a promising demulsifies to demulsify the crude oil-in-water emulsion or the oily wastewater but also give a deep understanding on the intrinsic interaction between demulsifiers and asphaltenes.

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Section: Quantum Chemical Calculationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Recyclable magnetic graphene oxide for rapid and efficient demulsification of crude oil-in-water emulsion

Liu

Wang

et al. 2017

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127

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“…Superfícies hidrofóbicas tem despertado a atenção de muitas pesquisas acadêmicas e também tecnológicas devido a algumas propriedades que estes revestimentos apresentam, destacando-se a auto-limpeza, anti-gelo (do inglês "anti-icing"), anti-aderente e anti-corrosão [1][2][3][4][5]. O desenvolvimento destas superfícies baseiam-se em duas estratégias: uma delas, é criar uma superfície rugosa e modificá-la com materiais que possuem baixa energia superficial; a outra, é usando metodologias capazes de aumentar a rugosidade do substrato o qual já apresenta características hidrofóbicas (CA>90°) [6][7][8]. Atualmente, superfícies hidrofóbicas têm sido desenvolvidas utilizando materiais de baixa energia superficial com estruturas que apresentam micro ou nano-rugosidade.…”

Section: Introductionunclassified

Influência Da Modificação Superficial Sobre a Resistência À Corrosão Do Aço Inoxidável Aisi 204 Com Revestimento Hidrofóbico

Sacilotto¹,

Ferreira²

2016

TMM

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ResumoNeste trabalho foi avaliada a resistência à corrosão do aço inoxidável AISI 204 revestido com filme hidrofóbico de silano. Quatro sistemas foram analisados combinando o tempo de hidrólise do silano na solução sol-gel e a rugosidade do substrato. Estes parâmetros foram definidos como: 24 horas de hidrólise e substrato rugoso (24HJ), 2 horas de hidrólise e substrato rugoso (2HJ), 2 e 24 horas de hidrólise com o substrato liso (2HN e 24HN). As amostras foram caracterizadas por diferentes técnicas: (a) microscopia eletrônica de varredura (MEV) foi usada para verificar a morfologia dos substratos; (b) medidas de ângulo de contato para verificar a eficiência do filme hidrofóbico desenvolvido neste estudo; (c) ensaios de névoa salina e espectroscopia de impedância eletroquímica (EIE) foram realizados para avaliar a resistência à corrosão. A amostra 24HJ que apresentou o maior ângulo de contato (130°) mostrou maior resistência à corrosão em comparação com as outras amostras. A metodologia usada para a obtenção do filme hidrofóbico mostrou-se eficiente para a proteção do metal base contra a corrosão. Palavras-chave: Revestimento hidrofóbico; Ângulo de contato; Resistência à corrosão; Modificação superficial; Silano. INFLUENCE OF MORPHOLOGICAL ALTERATION ON CORROSION RESISTANCE OF STAINLESS STEEL AISI 204 WITH HYDROPHOBIC COATINGS AbstractThis work studied the corrosion resistance of stainless steel AISI 204 coated by hydrofobic silane film. Four systems were evaluated matching silane hydrolysis time in sol-gel solution and the roughness of the substrate. These parameters were defined as: 24 hours of hydrolysis time and roughness substrate (24HJ), 2 hours hydrolysis time and roughness substrate (2HJ), 2 and 24 hours hydrolysis time with smooth substrates (2HN and 24HN). The following characterizations was applied: (a) scanning electron microscope (SEM) was used to check the substrates morphology; (b) the contact angle measurements (CA) tested the efficiency of hydrophobic film developed in this study; (c) the salt spray tests and electrochemical impedance spectroscopy (EIS) were performed for evaluating the corrosion resistance. The 24HJ presented higher water contact angle (130°) and it demonstrated greater corrosion resistance in comparison with the other samples. The methodology used to obtain the hydrophobic film presented efficient for the base metal corrosion protection. Keywords: Hydrophobic coatings; Water contact angle; Corrosion resistance; Surface modification; Silane. INTRODUÇÃOUm revestimento hidrofóbico é caracterizado por repelir a água quando em interação com algum material sólido. Para um revestimento ser considerado hidrofóbico é necessário que o ângulo de contato formado entre a superfície revestida e uma gota de água seja maior ou igual a 90°, enquanto que uma superfície superhidrofóbica apresenta um ângulo de contato (CA) maior ou igual a 150°. Superfícies hidrofóbicas tem despertado a atenção de muitas pesquisas acadêmicas e também tecnológicas devido a algumas propriedades que estes revestimen...

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“…If one of the phases in oil-water mixture is dispersed in the other as small droplets (smaller than the pore size) the meshes become ineffective. Hydrophobic porous media has been developed for separation of oil-water emulsions with and without surfactants [41][42][43][44]. Table 1 summarizes the literature which discusses various types of oil-water filtering membranes.…”

Section: Liquid Penetration Through Pores In Vibrating or Patterned Mmentioning

confidence: 99%

Vibrations and Spatial Patterns Change Effective Wetting Properties of Superhydrophobic and Regular Membranes

Ramachandran

2016

Biomimetics

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Small-amplitude fast vibrations and small surface micropatterns affect properties of various systems involving wetting, such as superhydrophobic surfaces and membranes. We review a mathematical method of averaging the effect of small spatial and temporal patterns. For small fast vibrations, this method is known as the method of separation of motions. The vibrations are substituted by effective force or energy terms, leading to vibration-induced phase control. A similar averaging method can be applied to surface micropatterns leading surface texture-induced phase control. We argue that the method provides a framework that allows studying such effects typical to biomimetic surfaces, such as superhydrophobicity, membrane penetration and others. Patterns and vibration can effectively jam holes and pores in vessels with liquid, separate multi-phase flow, change membrane properties, result in propulsion, and lead to many other multiscale, non-linear effects. Here, we discuss the potential application of these effects to novel superhydrophobic membranes.

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Superhydrophobic and Superoleophilic PVDF Membranes for Effective Separation of Water‐in‐Oil Emulsions with High Flux

Cited by 1,027 publications

References 38 publications

Recyclable magnetic graphene oxide for rapid and efficient demulsification of crude oil-in-water emulsion

Recyclable magnetic graphene oxide for rapid and efficient demulsification of crude oil-in-water emulsion

Influência Da Modificação Superficial Sobre a Resistência À Corrosão Do Aço Inoxidável Aisi 204 Com Revestimento Hidrofóbico

Vibrations and Spatial Patterns Change Effective Wetting Properties of Superhydrophobic and Regular Membranes

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