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A free-standing superhydrophobic film for highly efficient removal of water from turbine oil

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Frontiers of Chemical Science and Engineering 2019年第2期13卷 393-399页

作者： Fan Shu Meng Wang Jinbo Pang Ping Yu College of Chemistry and Molecular Sciences Wuhan UniversityWuhan 430072China Institute for Advanced Interdisciplinary Research (iAIR) University of JinanJinan 250022China

A free-standing superhydrophobic film is prepared by sequentially dip-coating a commercially available filter paper with nano SiO2 suspension, epoxy emulsion, and octyltrimethoxysilane solution. A surface with micro- or nano-roughness is formed because SiO2 nanoparticles are uniformly and firmly adhered on the backbone of the filter paper by the cured epoxy resin. Furthermore, the surface energy is significantly reduced because of introducing octytrimethoxysilane. Such a surface structure makes the prepared film a superhydrophobic material. Due to its free-standing nature, this superhydrophobic film can be used to remove water from turbine oil by filtration. The efficiency of water removal is high (up to 94.1%), and the filtration process is driven solely by gravity without extra energy consumption. Because of the facile fabrication process and the high efficiency of water removal, this free-standing superhydrophobic film may find application in power industry.

关键词： superhydrophobicity nanoparticles dip coating epoxy emulsion turbine oil

Study of the impact of the compaction and curing temperature on the behavior of cold bituminous recycled materials

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Journal of Traffic and Transportation Engineering(English Edition) 2019年第4期6卷 349-358页

作者： Apparao Gandi Alberto Cardenas Djibril Sow Alan Carter Daniel Perraton Department of Construction Engineering Ecole de Technologie SuperieureMontrealQC H3C 1K3Canada Department of Construction Engineering University of ThiesThiesSenegal

In most countries, there is a low temperature limit to lay down hot asphalt mixes because if it is too cold, it becomes impossible to get proper compaction. For cold recycled bituminous mixture(CRM), there is little information on the effect of the low temperature on their behavior. The goal of this study is to evaluate, in laboratory, the impact of the compaction and curing temperature on the behavior of CRM. To do so, CRM containing 50%reclaimed asphalt pavement(RAP) and 50% natural aggregates treated with foamed asphalt or bituminous emulsion were mixed and cured at different temperature between 0 and23℃ for up to 10 days before being tested in indirect tension. The results show that for all mixes, a cure at lower temperature means lower tensile strength, but the decrease is more noticeable for emulsion treated materials than for foamed treated mixes. The trend is not as obvious for Marshall stability results. A second cure at ambient temperature was also done, and the analysis of the results showed that the decrease in mechanical performance remains important even after a second cure at higher temperature for all mixes treated with bituminous emulsion, but there is some mechanical gain for mixes treated with foamed asphalt.

关键词： Cold recycled materials Bituminous emulsion Foamed asphalt Curing Marshall stability Indirect tensile strength

Highly efficient [C8mim][Cl] ionic liquid accompanied with magnetite nanoparticles and different salts for interfacial tension reduction

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Chinese Journal of Chemical Engineering 2020年第1期28卷 46-53页

作者： Sajjad Hashemi Javad Saien Department of Applied Chemistry Bu-Ali Sina UniversityHamedanIran

The 1-octyl-3-methylimidazolium chloride, [C8 mim][Cl] ionic liquid(IL) was used as a novel surfactant in n-heptane/water system. The interfacial tensions(IFT) were measured and corresponding variations were investigated. An IFT reduction of 80.8% was appropriate under the IL CMC of about 0.1 mol·L^-1 and stronger effects were achieved when magnetite nanoparticles and salts were present profoundly under alkaline p Hs.The equilibrium IFT data were accurately simulated with the Frumkin adsorption model. Hereafter, the saturated surface concentration, equilibrium constant and interaction parameter were obtained and their variations were demonstrated. Further, emulsion stability and contact angle of oil/water interface over quartz surface were studied. The oil/water emulsion stability was hardly changed with nanoparticles;however, the stability of oil/water + IL emulsions was significantly improved. It was also revealed that the presence of sodium and calcium chloride electrolytes fortifies the IL impact, whereas sodium sulfate weakens. From dynamic IFT data and fitting with kinetic models, it was found that the IL migration toward interface follows the mixed diffusion–kinetic control model. Consequently, the IL diffusion coefficient and the appropriate activation energy were determined.

关键词： Imidazolium ionic liquids Interfacial tension Magnetite nanoparticle emulsion stability Frumkin adsorption model Adsorption kinetic model

Improvement to anti-rust property of hot rolled rebar by compact oxide scale

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Journal of Central South University 2017年第12期24卷 2813-2818页

作者：陈庆安刘立忠刘鑫刘相华 State Key Laboratory of Rolling and Automation Northeastern University Shenyang 110819 China College of Mechanical and Equipment Engineering Hebei University of Engineering Handan 056038 China School of Material and Metallurgy Northeastern University Shenyang 110819 China Research Academy Northeastern University Shenyang 110819 China

A method was proposed to improve the anti-rust property of hot rolled rebar, which uses oil–water emulsion cooling instead of water cooling after hot rolling. The experiments were carried out by two cooling methods, one cooled by water, the other cooled by oil–water emulsion. The results of wet/dry cyclic accelerated corrosion test showed that the anti-rust property of rebar cooled by oil–water emulsion was better than that by water obviously. The results of OM, SEM and EPMA analysis indicated that these two scales contained three layers: an outer Fe_3O_4 layer, an intermediate Fe O layer with island-shaped pro-eutectoid Fe_3O_4, an inner eutectoid Fe_3O_4 layer. For the water cooled rebar, all three layers of oxide scale were relatively thin. Moreover, the scale had plenty of defects such as porosity, and crack. However, for the oil–water emulsion cooled rebar, all three layers of oxide scale were relatively thick and compact, which played an important role in protecting the rebar from atmospheric rust.

关键词： hot rolled rebar anti-rust property compact oxide scale oil–water emulsion cooling

Determination of Pyrethroids in Human Urine by Gas Chromatography

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Biomedical and Environmental Sciences 1994年第3期7卷 216-221页

作者： WUYI－QUN GAOXIAO－YEN 等 InstituteofOccupationalMedicine ChineseAcademyofPreventiveMedicine29NanWeiRoadBeijing100050China I

A gas chromatographic method for the determination of deltamethrin and fenvalerate in human urine is described. Both deltamethrin and fenvalerate have been analysed by gas chromatography with a electron capture detector. The least detectable concentration of both pyrethroids in urine is 0.2 g per litre. The precision and accuracy of the method were within acceptable limits. The method has been used to determine the pyrethroids in urine samples obtained from packers, spraymen and acute pyrethroids poisoning patients

关键词： Chromatography Walden TABLE Clean Canada Rec emulsion

A THEORETICAL RESEARCH TO EFFECTIVE VISCOSITY OF COLLOIDAL DISPERSIONS

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Applied Mathematics and Mechanics(English Edition) 2000年第3期21卷 275-282页

作者：顾国庆余建华 School of Computer Engineering University of Shanghai for Science and Technology Shanghai P R China Physics Department The Chinese University of Hong Kong Shatin New Territories Hong Kong P R China

Colloidal dispersions are common in nature with wide industrial applications. One of the central theoretical problems in the field is to determine the rheological properties of the colloidal dispersion from the microstructures of the systems. Because of the difficulties associated with the boundary-value problems of the many-particle system, existing theories for colloidal suspensions are limited to low particle concentrations. In this work, a method of transformation field is developed by which one can calculate the effective viscosity of an incompressible viscous fluid containing colloidal particles ( either solid particles or liquid drops). The predictions of the theory are in goad agreement with the Einstein's formula for suspensions and the Taylor's formula for emulsions at low particle concentrations. At higher particle concentrations, the results of Nunan and Keller are produced. The method is also applicable to the viscosity of colloidal systems with non-spherical particles.

关键词： multiphase flow colloidal dispersion suspension emulsion

Role of the porphyrins and demulsifiers in the aggregation process of asphaltenes at water/oil interfaces under desalting conditions:a molecular dynamics study

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Petroleum Science 2020年第3期17卷 797-810页

作者： H.Santos Silva A.Alfarra G.Vallverdu D.Bégué B.Bouyssiere I.Baraille Institut des Science Analytiques et Physico-Chimie pour l’Environnement et les Materiaux UMR 5254CNRS/Univ Pau&Pays Adour64000 PauFrance Total Research and Technology GonfrevilleBP 2776700 HarfleurFrance Joint Laboratory C2MC:Complex Matrices Molecular Characterization Total Research and TechnologyGonfrevilleBP 2776700 HarfleurFrance

Breaking water-in-oil emulsions during the refining of crude oils is an important step before any upgrading process is started.Asphaltene molecules are incriminated as playing an important role in this phenomenon.Unraveling the mechanisms behind the affinity between them and water is a key step to understand how to break these emulsions more easily and require lower amounts of demulsifiers.Choosing which demulsifier molecule(s)to use is also primordial,but to do so rationally,one needs to know which are the molecular interactions in place between asphaltenes,porphyrins and water so that demulsifiers are chosen to destabilize a specific physical–chemical interaction.In this paper,we study the interactions arising between asphaltenes and porphyrins and six different molecules potentially displaying a demulsification action in the presence of water/oil interfaces.We demonstrate that the ionic demulsifier molecules present an interesting potential to either interact strongly with water,replacing asphaltenes in this interaction,or to interact with the active sites of asphaltenes,deactivating them and avoiding any asphaltenic interfacial activity.Finally,we also found that although asphaltenes do not migrate spontaneously toward the water/oil interfaces,porphyrins do so rather easily.This indicates that porphyrins do have an important activity at the water/oil interface.

关键词： Asphaltenes aggregation Petroporphyrins Molecular dynamics emulsion Water-oil interface Demulsifiers

A novel oil-in-water drilling mud formulated with extracts from Indian mango seed oil

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Petroleum Science 2020年第1期17卷 196-210页

作者： Saket Kumar Aarti Thakur Nitesh Kumar Maen M.Husein Department of Chemical and Petroleum Engineering The University of CalgaryCalgaryAB T2N 1N4Canada Emerson Innovation Center PuneMaharashtraIndia MDNK Oil and Gas Consultants MumbaiMaharashtraIndia

Drilling muds with less environmental impact are highly desired over conventional diesel-based mud systems,especially in light of the emerging strict environmental laws.In this article,a novel oil-in-water(O/W)emulsion drilling fluid formulated with a methyl ester extracted from Indian mango seed oil was evaluated.The effect of the weight percent of different constituents of the emulsion/suspension including the oil phase,bentonite,and polyanionic cellulose polymer on the rheology and the fluid loss was examined.The methyl ester oil phase/mud system displayed superior physical,chemical,rheological and filtration properties relative to the diesel and the mango seed oil.Eco-toxicity of the methyl ester and diesel(O/W)emulsion mud systems was assessed using the acute lethal concentration test.The Indian mango methyl ester(O/W)emulsion mud displayed much less impact on fish population.Flow characteristics collected from the flow model at 85°C suggested excellent shear thinning behavior of the Indian mango methyl ester(IMME)(O/W)emulsion mud.Moreover,the IMME(O/W)emulsion displayed strong pseudoplastic behavior,an attractive feature in a drilling mud,with increasing clay content and polymer concentration.The methyl ester mud was thermally stable over a wide range of the constituent concentrations.Furthermore,a particle size analysis revealed that engineered drilling muds targeting suspension of particles with certain size range can be formulated by changing the volume fraction of the methyl ester in the mud system.

关键词： Indian mango seed oil Fluid loss emulsion drilling mud Shear thinning Pseudoplastic fluid

A Green Approach to Producing Polymer Microparticles for Local Sustained Release of Flavopiridol

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Chemical Research in Chinese Universities 2021年第5期37卷 1116-1124页

作者： Matthew J.OWEN Jasper H.N.YIK Congwang YE Brianca NETTO Dominik R.HAUDENSCHILD Gang-yu LIU Department of Chemistry University of CaliforniaOne Shields AvenueDavisCalifornia95616USA Department of Orthopedic Surgery University of California-Davis School of Medicine4635 Second Ave.SacramentoCalifornia95817USA Materials Engineering Division Lawrence Livermore National LaboratoryLivermoreCalifornia94550USA

Poly(lactic-co-glycolic acid)(PLGA)microparticles represent an important class of materials used for drug delivery.Current synthesis frequently uses conventional emulsion,where dichloromethane(DCM)is used as the organic phase solvent.Due to the health and environmental toxicity of DCM and its slow degradation,this work replaces DCM with a greener solvent,dimethyl carbonate(DMC).

关键词： Release replace emulsion