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Effect of diluent on interfacial emulsion in copper solvent extraction

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中国有色金属学会会刊：英文版 2000年第S1期10卷 97-100页

作者：刘晓荣邱冠周胡岳华柳建设李丽 Cent S Univ Technol Dept Mineral Engn Changsha 410083 Peoples R China

The organic phase extracted from interfacial crud of copper solvent extraction at Dexing Copper Mine was analyzed for its different components by combined gas chromatography mass spectroscopy. It was found that the main impurities in organic phase were methylnaphthalenes and di methylnaphthalenes which originated from commercial 260# kerosene used as diluent. It was found that the impurities containing diluent was unfavorable to phase disengagement. Methods were suggested to improve diluent properties to prevent stable interfacial emulsion.

关键词： organic phase components diluent surface tension interfacial emulsion copper solvent extraction

Effects of Volume Ratios of Water Phase to Oily Phase on Morphology and Releasing Performance of emulsion Electrospun Fibers

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Journal of Donghua University(English Edition) 2014年第5期31卷 577-581页

作者： LIN Gang HU Jue DING Xin PENG Xiao HU Ji-yong YANG Xu-dong Key Laboratory of Textile Science & Technology Ministry of Education of China Donghua University Shanghai 201620 China College of Textiles Donghua University Shanghai 201620 China

emulsion electrospinning as a novel process in spinning core-sheath fibers shows a promising potential in drug release control. The volume ratio of water phase to oily phase is one of the critical parameters in forming core-sheath fibers. In this study, water phase was presented by hydrophilic tetracycline hydrochloride and oily phase by hydrophobic poly （E-caprolactone）（PCL）. The effects of volume ratios of water phase to oily phase on fiber morphology and in vitro drug release were investigated. Scanning electron microscopy （ SEM ）, transmission electron microscopy （ TEM）, and eonfoeal laser scanning microscopy（CLSM） were used to observe the morphology, core.sheath structure of the fibers and drug loading in the fibers, respectively. Samples of three different volume ratios of water phase to oily phase, 1： 25, 1：15, and 1：10, were prepared with the same concentration of drug solution. Experiment results showed that, with an increase in the volume ratios of water phase to oily phase, the fiber diameter increased and diameter distribution scattered. The drug entrapment efficiency of the fibers reduces with the increase in volume ratios, L e. , from 73.48 % in the ratio of 1 ： 25, 62.23 % in 1 ： 15, down to 45.63 % in 1：10. In vitro release tests showed that a higher volume ratio of water phase to oily phase would lead to a lower release rate resulted from thicker fiber sheath.

关键词： emulsion electrospinning volume ratio of water phase tooily phase drug entrapment efficiency ~ sustained release

Preparation of Microcapsules by Drying-in-liquid with a [(O_Ⅰ/W_Ⅰ)/O_Ⅱ]/W_Ⅱ Multi-emulsion

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Chemical Research in Chinese Universities 2002年第4期18卷 438-440页

作者： ZHANG Rong-changNormal College of Sciences, Beihua University, Jilin 132013, P. R. China Normal College of Science Beihua University 吉林 132013

The microencapsulation of the extractant was studied by drying-in-liquid with a [(O_Ⅰ/W_Ⅰ)/O_Ⅱ]/W_Ⅱ multi-emulsion. The microcapsules were characterized by the release efficiency of the extractants to discuss the effect of Tween 60, gelatin, and EC on the experimental results. The size dispersity of microcapsules with the different concentrations of gelatin was also discussed. The results show that microcapsules with good membrane tension for several extractants can be obtained with this method.

关键词： Microcapsule emulsion Drying-in-liquid method EC Extractants

Importance of adapted digestion conditions to simulate in vitro lipid digestion of broilers in different life stages

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Animal Nutrition 2023年第1期12卷 151-158页

作者： Daphne Michels Sarah H.E.Verkempinck Agnese Panozzo Karen Vermeulen Marc E.Hendrickx Liesbet Thijs Tara Grauwet Laboratory of Food Technology and Leuven Food Science and Nutrition Research Centre(LFoRCe) Department of Microbial and Molecular Systems(M2S)KU LeuvenLeuven3001Belgium Kemin Animal Nutrition and Health Kemin Europa N.V.Herentals2200Belgium

In vitro digestion studies demonstrate large potential to gain more and quicker insights into the underlying mechanisms of feed additives,allowing the optimization of feed design.Unfortunately,current in vitro digestion models relevant for broiler chickens lack sufficient description in terms of protocols and standardisation used.Furthermore,no distinction is made between the different life phases of these animals(starter,grower,and finisher).Hence,our research aimed to establish adapted in vitro digestion conditions,corresponding to the 3 life phases in broilers,with specific focus on lipid digestion.The effect of 3 different bile salt concentrations of 2,10,and 20 mM,and 3 different lipase activities of 5,20,and 100 U/mL,on in vitro lipid digestion kinetics were evaluated using a full factorial design.These values were selected to represent starter,grower,and finisher birds,respectively.Our findings showed that the extent of lipid digestion was mainly influenced by lipase activity.The rate of lipid digestion was affected by an interplay between bile salt concentration and lipase activity,due to possible lipase inhibition at certain bile salt concentrations.Overall,this work resulted in 3 in vitro lipid digestion models representative for starter,grower,and finisher birds.In conclusion,this research showed the impact of adapted in vitro digestion conditions on lipid digestion kinetics and thus the need for these conditions relevant for each life phase of broilers.

关键词： Lipolysis Lipase activity Bile salt In vitro digestion Broiler chicken emulsion

Experimental investigation on the enhanced oil recovery efficiency of polymeric surfactant: Matching relationship with core and emulsification ability

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Petroleum Science 2023年第1期20卷 619-635页

作者： Xin Chen Yi-Qiang Li Zhe-Yu Liu Japan Trivedi Wen-Bin Gao Ming-Yue Sui State Key Laboratory of Oil and Gas Resources and Exploration School of Petroleum EngineeringChina University of Petroleum(Beijing)Beijing 102249China Faculty of Engineering-Civil and Environmental Engineering University of AlbertaEdmontonAlberta T6G 2R3Canada Institute of Rock and Soil Mechanics Chinese Academic of SciencesWuhanHubei 430071China PetroChina Changqing Oilfield Co Research Institute of Oilfield Exploration and Development XianShaanxi 710018China

The polymeric surfactant can be used as an efficient agent for enhanced oil recovery(EOR)because of its large bulk viscosity and good interfacial activity.However,there is a sparse understanding of its matching relationship with reservoirs and emulsification occurrence conditions,which may affect its migration and EOR efficiency.One intermolecular association molecule polymeric surfactant(IAM)was synthesized by micellar polymerization and characterized with 1 H NMR,FTIR,and TGA.The matching relationship between IAM and reservoirs was evaluated by comparing the viscosity retention rate of effluent in the core flow experiments.Moreover,the effect of the matching relationship on EOR in the heterogeneous reservoir was clarified with parallel core displacement experiments by considering different flow abilities of IAM in the high-permeability layer.The occurrence conditions of in-situ emulsification of IAM were evaluated via oil-water co-injection experiments under the different injection rates and oil-water ratios.Microscopic visualization displacement was carried out to compare the micro EOR mechanisms of different chemical systems.The results show that IAM features thickening,shearing resistance,viscoelasticity,thermal stability,and interfacial activity.The matching relationship between cores and IAM could be divided as hardly injected,flow limited,and flow smoothly,corresponding to the viscosity retention ratio of80%,respectively.IAM could gain better EOR efficiency(17.69%)when its matching relationship to the high permeability layer was“flow limited”.The defined mixture capillary number shows that only when it is greater than 1×10^(3),the in-situ emulsions can be generated.Compared to HPAM,IAM could reduce IFT and form vortices to more effectively displace film and corner remaining oils by stripping and peeling off crude oil.The formed emulsion accumulated at the pore throat could further increase flow resistance,which benefits swept area enlargement.This work could provide theoretical and data s

关键词： Migration Matching relationship Viscosity retention ratio emulsion EOR

Pickering emulsions stabilized by colloidal surfactants:Role of solid particles

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Particuology 2022年第5期20卷 153-163页

作者： Zhu Sun Xiaoxiao Yan Yao Xiao Lingjie Hu Max Eggersdorfer Dong Chen Zhenzhong Yang David AWeitz College of Energy Engineering and State Key Laboratory of Fluid Power and Mechatronic Systems Zhejiang UniversityHangzhou 310027China Department of Medical Oncology The First Affiliated HospitalSchool of MedicineZhejiang UniversityHangzhou 310003China John A.Paulson School of Engineering and Applied Sciences Harvard UniversityCambridgeMA 02138USA Department of Chemical Engineering Tsinghua UniversityBeijing 100084China

Pickering emulsions are emulsions stabilized by colloidal surfactants,i.***.solid particles.Compared with traditional molecular suffactant-stabilized emulsions,Pickering emulsions show many advantages,such as high resistance to coalescence,long-term stability,good biocompatibility and tunable properties.In recent years,Pickering emulsions are widely applied in scientific researches and industrial applications.In this review,we focus on the influences of particle properties on Pickering emulsions,including particle amphiphilicity,concentration,size and shape,and summarize the strategies developed for the preparation of amphiphilic Janus particles.The applications of Pickering emulsions in food industry,cosmetic industry,material science,drug delivery,biomedical research and vaccine adjuvant will also be covered.Pickering emulsions are a unique system for multi-disciplinary studies and will become more and more important in the future.

关键词： emulsion Pickering emulsion Particle Colloidal surfactant Amphiphilicity

Detachable and hierarchical assemblies for recyclable and highly efficient oil-fouling removal

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Nano Research 2023年第2期16卷 2551-2562页

作者： Tengda Wang Shaoying Dai Jie Wang Bin Liu Meiwen Cao Bo Guan Yuchun Han Yilin Wang CAS Key Laboratory of Colloid Interface and Chemical ThermodynamicsBeijing National Laboratory for Molecular Sciences(BNLMS)CAS Research/Education Center for Excellence in Molecular SciencesInstitute of ChemistryChinese Academy of SciencesBeijing 100190China University of Chinese Academy of Sciences Beijing 100049China State Key Laboratory of Heavy Oil Processing Department of Biological and Energy Chemical EngineeringCollege of Chemical EngineeringChina University of Petroleum(East China)Qingdao 266580China

Large-scale use of detergents to remove oil-fouling in industry continuously generates tremendous amounts of wastewater and thus leads to both economic and environmental problems.To develop recyclable oil-fouling removal strategy is an appealing solution but a challenging task.Herein,a kind of dynamic imine-based surfactant has been constructed by 2-formylbenzenesulfonic acid sodium salt(FBSS)and linear amines(CnNH_(2),n=6,7,8,10,and 12).Owing to high interfacial activity and strong assembly ability,dynamic FBSS/C8NH_(2)system can remove oil-fouling on multiple substrates for at least 10 cycles,largely reducing the toxicity to ecosystem.At basic pH,the hierarchical assemblies(from vesicle to network and hollow sphere)are formed and boost surfactant molecule enrichment around oil-fouling,leading to highly efficient emulsification.When pH is changed to acidic condition,the surfactant molecules dissociate due to the breaking of imine bonds,and accordingly the emulsion is destroyed and the released oil droplets float to the top layer.After removing the oil-fouling and adjusting the solution back to basic pH,the surfactant assemblies are reconstructed and used for the next oil-fouling cleaning cycle.This study provides a recyclable,efficient and eco-friendly oil-fouling removal approach,satisfying the need of sustainable development.

关键词： dynamic covalent bond hierarchical assembly oil-fouling removal emulsion oil/water separation

Templating core-shell particles using metal ion-chelating biosurfactants

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Particuology 2022年第5期20卷 145-152页

作者： Ching-Min Yeh Thomas Jarrett Yuan Gao Chun-Xia Zhao Andrew Whittaker Frank Sainsbury Alison L.White Australian Institute of Bioengineering and Nanotechnology The University of QueenslandSt.LuciaQueensland4072Australia ARC Centre of Excellence in Convergent Bio-Nano Science and Technology The University of QueenslandSt Lucia4072Australia CSIRO Probing Biosystems Future Science Platform BrisbaneAustralia Centre for Cell Factories and Biopolymers Griffith Institute for Drug DiscoveryGriffith UniversityBrisbaneQLD4111 Australia

Designer biosurfactants can be used to stabilise and functionalise interfaces.One particularly promising use is the stabilisation of oil-in-water emulsions,enabling fine tuning physical,chemical and biological surface properties.The ability of emulsion systems to carry high payloads makes them attractive for applications in medicine,food and fragrances,and cosmetics.However,they have limited long-term stability.Here we sought to use the metal ion-chelating ability of the biosurfactant peptide,AM1,to precipitate the formation of a gold metal shell on AM1-stabilised emulsions by electroless plating.We found that replacing the commonly used zinc(Ⅱ)with palladium(Ⅱ)for coordination by histidine residues of adjacent AM1 peptides produced interfacial films that maintained elasticity at acidic pH.Proton NMR suggested a coordination mechanism independent of the imidazole ring of the histidines.Nevertheless.stabilisation of emulsions at low pH enabled the deposition of a gold shell,albeit by an unexpected mechanism.We propose that gold nanoparticles forming in bulk are adsorbed onto the peptide-stabilised interface,accumulating into a particulate coating.The resulting one-step method for nanoparticle precipitation and shell formation will be useful for the creation of biocompatible core-shell particles for applications where large payloads of hydrophobic active compounds require stability over long time periods.

关键词： Biosurfactants emulsion Core-shell particles Electroless plating Histidine Interfacial elasticity

Recent progress of fat reduction strategies for emulsion type meat products

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Food Materials Research 2022年第1期2卷 92-101页

作者： Haozhen Zhang Weiyi Zhang Xianming Zeng Xue Zhao Xinglian Xu Key Laboratory of Meat Processing and Quality Control Ministry of EducationJiangsu Collaborative Innovation Center of Meat Production and ProcessingQuality and Safety ControlNanjing Agricultural UniversityNanjing 210095PR China

With the continuous improvement of living standards,people’s demand for meat products is increasing.However,the high fat content in traditional meat products will result in additional chronic diseases,causing harm to human health.Hence,there exists an urgent need for research on fat reduction technology of meat products.Recently,physical modification technologies and protein/carbohydrate/lipid/complexbased fat substitutes have gained great interest in reducing animal fat,which can simultaneously improve the technological and sensory properties of meat products.In this thriving field,many newly presented works lack comprehensive summary and critical comparison.Therefore,this paper reviews the latest research progress on the application of physical technologies and fat substitutes in fat-reduced meat products,highlighting their advantageous and disadvantageous in reducing total fat,improving the fatty acid profile and modifying technological and sensory properties of products.Finally,future trends are proposed with the aim to provide new insight into the development of quality fatsubstituted meat products.

关键词： gained emulsion technological