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Destructing surfactant network in nanoemulsions by positively charged magnetic nanorods to enhance oil-water separation

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Journal of Environmental Sciences 2022年第8期34卷 112-121页

作者： Yongjiao Xiong Xiangfeng Huang Lexue Li Wanqi Liu Jialu Zhang Mengfan He Jia Liu Lijun Lu Kaiming Peng College of Environmental Science and Engineering State Key Laboratory of Pollution Control and Resource ReuseMinistry of Education Key Laboratory of Yangtze River Water EnvironmentTongji UniversityShanghai 200092China

The separation of ultrafine oil droplets from wasted nanoemulsions stabilized with high concentration of surfactants is precondition for oil reuse and the safe discharge of ***, the double barriers of the interfacial film and network structures formed by surfactants in nanoemulsions significantly impede the oil-water separation. To destroy these surfactant protective layers, we proposed a newly-developed polyethyleneimine micelle template approach to achieve simultaneous surface charge manipulation and morphology transformation of magnetic nanospheres to magnetic nanorods. The results revealed that positively charged magnetic nanospheres exhibited limited separation performance of nanoemulsions, with a maximum chemical oxygen demand(COD) removal of 50%, whereas magnetic nanorods achieved more than 95% COD removal in less than 30 s. The magnetic nanorods were also applicable to wasted nanoemulsions from different sources and exhibited excellent resistance to wide pH changes. Owing to their unique one-dimensional structure, the interfacial dispersion of magnetic nanorods was significantly promoted, leading to the efficient capture of surfactants and widespread destruction of both the interfacial film and network structure, which facilitated droplet merging into the oil phase. The easy-toprepare and easy-to-tune strategy in this study paves a feasible avenue to simultaneously tailor surface charge and morphology of magnetic nanoparticles, and reveals the huge potential of morphology manipulation for producing high-performance nanomaterials to be applied in complex interfacial interaction process. We believe that the newly-developed magnetic-nanorods significantly contribute to hazardous oily waste remediation and advances technology evolution toward problematic oil-pollution control.

关键词： Nanoemulsions Surface charge Magnetic nanorods Surfactant interfacial film Oil-water separation

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Spatially resolved micron-scale wrinkle structures at asphaltene films induced by mild thermal treatment and its impact on emulsion stability

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Petroleum Science 2022年第6期19卷 3107-3115页

作者： Qiang Chen Hui-Jie Yang He Liu Yi Liu Dong-Feng Zhao State Key Laboratory of Heavy Oil Processing College of Chemical EngineeringChina University of Petroleum(East China)QingdaoShandong 266580China Department of Energy Conservation and Cleaner Production Qingdao OASIS Environmental&Safety Technology Co.LtdQingdaoShandong 266555China

Mild thermal treatment is an important partial upgrading technique to enable bitumen pipeline transportation,but no attention has been paid to the impact of mild thermal treatment on the emulsification behavior of emerging partially upgraded *** compounds are active emulsion stabilizers in bitumen *** emulsion stabilizing capacity of bitumen asphaltenes was investigated,before and after a mild thermal treatment at 400℃.The structural morphology and mechanical property of the asphaltene interfacial films were analyzed by using a combination of cryo-SEM,Langmuir trough,and Brewster angle *** thermal treatment significantly enhanced the emulsion stabilizing capacity of bitumen asphaltenes;the interfacial films formed by the thermally treated asphaltene samples appeared to be rougher and thicker with more abundant micron-scale wrinkle *** interfacial corrugation may intensify the mechanical stability/flexibility of the asphaltene films and consequently strengthen the stability of emulsion droplet.

关键词： Asphaltenes interfacial film Emulsion stabilizing capacity Mild thermal treatment

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Effect of modification degrees on the interfacial properties and EOR efficiency of amphiphilic Janus graphene oxide

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Petroleum Science 2023年第2期20卷 1217-1224页

作者： Han Jia Xin Wei Qiu-Xia Wang Yuan-Bo Wang Shi-Jie Wen Fang-Ning Fan Qiang Wang Zhe Wang De-Xin Liu Pan Huang Key Laboratory of Unconventional Oil&Gas Development(China University of Petroleum(East China)) Ministry of EducationQingdaoShandong 266580China Shandong Key Laboratory of Oilfield Chemistry School of Petroleum EngineeringChina University of Petroleum(East China)QingdaoShandong 266580China Bohai Oilfield Research Institute Tianjin BranchCNOOC China LimitedTianjin 300459China Department of Chemical and Materials Engineering University of AlbertaEdmonton AB T6G 1H9Canada

Asymmetrically modified Janus graphene oxide(JGO)has attracted great attention due to its unique physical chemistry properties and wide *** modification degree of Janus nanosheets inevitably affects their interfacial activity,which is essential for their performances in enhanced oil recovery(EOR).In this study,the interfacial properties of Janus graphene oxide(JGO)with various modification degrees at liquid-liquid and liquid-solid interfaces were systematically evaluated via the measurements of interfacial tension(IFT),dilatational modulus,contact angle,and EOR efficiency was further assessed by core flooding *** is found that JGO-5 with higher modification degree exhibits the greater ability to reduce IFT(15.16 mN/m)and dilatational modulus(26 mN/m).Furthermore,JGO can construct interfacial and climbing film with the assistance of hydrodynamic power to effectively detach the oil from the rock surface and greatly enhance oil *** modified JGO-2 can highly improve recovery of residual crude oil(11.53%),which is regarded as the promising EOR agent in practical *** present study firstly focuses on the effects of modification degrees on the JGO interfacial properties and proposes diverse EOR mechanisms for JGO with different modification degrees.

关键词： Graphene oxide Modification degrees Janus nanosheets interfacial film EOR

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Studies on Middle-Phase Microemulsions of Green Surfactant n-Dodecyl Polyglucoside C_(12)G_(1.46)

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Chinese Journal of Chemistry 2003年第1期21卷 25-29页

作者：柴金岭吴长举李干佐张高勇 Chemistry Department Shandong Normal University Key Laboratory for Colloid and Interface Chemistry of State Education Ministry Shandong University

The three-phase behavior in the quaternary system of n-dodecyl polyglucosideC_(12)G_(1.46)/1-butanol/cyclohexane/water has been studied at 40℃ in terms of the variables γ andδ. Increasing δ at constant γ causes a phase inversion from an oil-in-water microemulsion incontact with excess oil (winsor Ⅰ or 2) to a water-in-oil microemulsion in contact with excesswater (winsor Ⅱ or 2) via a middle-phase microemulsion in contact with excess oil and water (winsorⅢ or 3). By taking into account the different solubilities of alkyl pdyglucoside and 1-butanol inthe oil phase, the composition of the hydrophile-lipophile balanced interfacial film in the middleof the three-phase body can be calculated. The effects of different oils and aqueous media on thephase behavior and on the composition of the interfacial film and the efficiency for alkyipolyglucoside to make equal weights of water and oil to a single phase were investigated. It wasfound that the oil molecules with small molecular volumes can improve the solubilizing efficiency ofthe surfactant to form single-phase microemulsion. In inorganic salt (NaCl) and acid (HCl)solutions, less 1-butanol is needed than that in alkali (NaOH) solution to form middle-phasemicroemulsion.

关键词： alkyi polyglucoside microemulsion phase diagram interfacial film

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沥青质和胶质的乳状液稳定性及其界面膜性质研究

沥青质和胶质的乳状液稳定性及其界面膜性质研究

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第九届全国化学工艺学术年会

作者：徐明进李明远吴肇亮林梅钦石油大学化学与工程学院石油大学化学与工程学院石油大学化学与工程学院石油大学化学与工程学院

研究了不同原油中沥青质和胶质乳状液稳定性和其形成的界面膜的界面膜性质。实验结果表明,含沥青质的乳状液稳定性高,其形成的界面膜剪切黏度数值大,沥青质分子和沥青质颗粒形成的界面膜性质不同。

关键词： emulsion asphaltene interfacial film

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