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surfactant and nanoparticle synergy:Towards improved foam stability

Petroleum 2023年第2期9卷 255-264页

作者： Arifur Rahman Farshid Torabi Ezeddin Shirif Petroleum Systems Engineering Faculty of Engineering and Applied ScienceUniversity of ReginaReginaSK S4S 0A2Canada Petroleum and Mining Engineering School of Applied Science&TechnologyShahjalal University of Science and TechnologySylhet3114Bangladesh

surfactant foam stability gets a lot of interest while posing a significant obstacle to many industrial operations.One of the viable solutions for addressing gas mobility concerns and boosting reservoir fluid sweep efficiency during solvent-based enhanced heavy oil recovery processes is foam formation.The synergistic effect of nanoparticles and surfactants in a porous reservoir media can help create a more durable and sturdier foam.This study aims to see how well a combination of the nanoparticles(NPs)and surfactant can generate foam for controlling gas mobility and improving oil recovery.This research looked at the effects of silicon and aluminum oxide nanoparticles on the bulk and dynamic stability of sodium dodecyl surfactant(SDS)-foam in the presence and absence of oil.Normalized foam height,liquid drainage,half-decay life,nanoparticle deposition,and bubble size distribution of the generated foams with time were used to assess static foam stability in the bulk phase,while dynamic stability was studied in the micromodel.To understand the processes of foam stabilization by nanoparticles,the microscopic images of foam and the shape of bubbles were examined.When nanoparticles were applied in foamability testing in bulk and dynamic phase,the foam generation and stability were improved by 23%and 17%,respectively.In comparison to surfactant alone,adding nanoparticles to surfactant solutions leads to a more significant pressure drop of 17.34 psi for SiO_(2)and 14.86 psi for Al_(2)O_(3)NPs and,as a result,a higher reduction in gas mobility which ultimately assists in enhancing oil recovery.

关键词： Foam stability Nanoparticles surfactant Foam decay Pressure drop Enhanced oil recovery Etc

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surfactant-assisted removal of 2,4-dichlorophenol from soil by zero-valent Fe/Cu activated persulfate

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Chinese Journal of Chemical Engineering 2022年第4期35卷 447-455页

作者： Ling Xu Ji Li Wenbin Zeng Kai Liu Yibing Ma Liping Fang Chenlu Shi Faculty of Material Science and Chemistry China University of GeosciencesWuhan 430074China Guangdong Key Laboratory of Integrated Agro-environmental Pollution Control and Management Institute of Eco-environmental and Soil SciencesGuangdong Academy of SciencesGuangzhou 510650China National-Regional Joint Engineering Research Center for Soil Pollution Control and Remediation in South China Guangzhou 510650China Macao Environmental Research Institute Macao University of Science and TechnologyTaipaMacaoChina

The organic compounds contaminated soil substantially threatens the growth of plants and food safety.In this study,we synthesis zero-valent bimetallic Fe/Cu catalysts for the degradation of 2,4-dichlorophenol(DCP)in soils with persulfate(PS)in combination of organic surfactants and exploring the main environmental impact factors.The kinetic experiments show that the 5%(mass)dosage of Fe/Cu exhibits a higher degradation efficiency(86%)of DCP in soils,and the degradation efficiency of DCP increases with the increase of the initial PS concentration.Acidic conditions are favorable for the DCP degradation in soils.More importantly,the addition of Tween-80,and Triton-100 can obviously desorb DCP from the soil surface,which enhances the degradation efficiency of DCP in soils by Fe/Cu and PS reaction system.Furthermore,the Quenching experiments demonstrate that SO_(4)^(-1)·and·OH are the predominant radicals for the degradation of DCP during the Fe/Cu and PS reaction system as well as non-radical also exist.The findings of this work provide an effective method for remediating DCP from soils.

关键词： Zero-valent iron and copper Advanced oxidation process Persulfate Chlorinated organic pollutants surfactant

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surfactant-regulated acetylpyrene assemblies as fluorescent probes for identifying heme proteins in an aqueous solution

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Chinese Chemical Letters 2023年第5期34卷 466-469页

作者： Binbin Yuan Shuangshuang Long Huamin Wang Qing Luo Ke Zeng Shuqin Gao Yingwu Lin School of Chemistry and Chemical Engineering University of South ChinaHengyang 421001China

Heme proteins play various important roles in a variety of physiological and pathological processes.surfactant assemblies have drawn great attention in fabricating fluorescent sensors to detect and identify proteins.In this study,an acetylpyrene fluorophore containing imidazole HP-1 was synthesized,and it could be well modulated by an anionic surfactant sodium dodecyl sulfate(SDS).The selected ensemble based on HP-1/SDS assemblies exhibited selective fluorescence sensing performance towards the heme proteins,including neuroglobin(Ngb),myoglobin(Mb)and cytochrome c(Cyt c).Besides,phospholipid DMPC vesicles as membrane models were particularly explored the association process between the heme protein Mb and membrane.The present work showed that Mb induced the lysis of DMPC liposomes visualized by transmission electron microscopy and optical microscope.

关键词： Heme proteins surfactant Fluorescent sensor Acetylpyrene Liposome

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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 effluent.However, 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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Demulsification performance and mechanism of oil droplets by electrocoagulation: Role of surfactant

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Journal of Environmental Sciences 2022年第8期34卷 171-180页

作者： Liang Wang Ben Zhang Bin Zhao Saiguo Yang Kun Wu Jingqiu Sun Chengzhi Hu State Key Laboratory of Separation Membranes and Membrane Processes School of Environmental Science and EngineeringTiangong UniversityTianjin 300387China State Key Laboratory of Environmental Aquatic Chemistry Research Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China School of Environmental and Municipal Engineering Xi’an University of Architecture and TechnologyXi’an 710055China Jiangsu Collaborative Innovation Center of Technology and Material of Water Treatment Suzhou University of Science and TechnologySuzhou 215009China

surfactants are widely used to improve the solubility of oil in water in petrochemical,making it more difficult to remove oil–water emulsions during the water treatment process.Electrocoagulation(EC) is an appropriate method for treating oily wastewater and destabilizing emulsions. However, the demulsification mechanism of oil–water droplets emulsified by surfactants with different charges have not been investigated systematically. The demulsification performance of electrocoagulation on emulsions wastewater containing cationic,non-ionic, and anionic surfactants was studied. The results showed that the removal rate of total organic carbon(TOC) in oily wastewater with anionic surfactant by EC reached92.98% ± 0.40% at a current density of 1 mA/cm^(2), while that of the non-ionic surfactant was 84.88% ± 0.63%. The characterization of flocs showed that EC has the highest coagulation and demulsification of oil droplets with a negative charge on the surface(-70.50 ± 10.25mV), which indicated that the charge neutralization of oil droplets was beneficial for the destabilization of the formed oily flocs. However, when the zeta potential of the oil droplets reached 75.50 ± 1.25 mV, the TOC removal efficiency was only 11.80% ± 1.43%. The TOC removal could achieve 33.23% ± 3.21% when the current density improved from 1 mA/cm^(2)to 10 mA/cm^(2). The enhanced removal was due to the sweep coagulation rather than charge neutralization. This study provides a fundamental basis for the electrochemical treatment of oily wastewater.

关键词： Charge neutralization Electrostatic repulsion Flotation surfactant

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surfactant dependent evolution of Au-Pd alloy nanocrystals from trisoctahedron to excavated rhombic dodecahedron and multipod： a matter of crystal growth kinetics

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Science Bulletin 2017年第20期62卷 1359-1364页

作者： Qiaoli Chen Guifen Du Yongdi Dong Zhenming Cao Zhaoxiong Xie Lansun Zheng State Key Laboratory of Physical Chemistry of Solid Surfaces Department of Chemistry College of Chemistry and Chemical Engineering Xiamen University Xiamen 361005 China Pen-Tung Sah Institute of Micro-Nano Science and Technology Xiamen University Xiamen 361005 China

In wet chemical syntheses of noble metal nanocrystals,surfactants play crucial roles in regulating their morphology.To date,more attention has been paid to the effect of the surfactant on the surface energy of crystal facets,while less attention has been paid to its effect on the growth kinetics.In this paper,using the growth of Au-Pd alloy nanocrystals as an example,we demonstrate that different concentration of surfactant hexadecyltrimethyl ammonium chloride(CTAC)may cause the different packing density of CTA+bilayers on different sites(face,edge or vertex)of crystallite surface,which would change the crystal growth kinetics and result in preferential crystal growth along the edge or vertex of crystallites.The unique shape evolution from trisoctahedron to excavated rhombic dodecahedron and multipod structure for Au-Pd alloy nanocrystals was successfully achieved by simply adjusting the concentration of CTAC.These results help to understand the effect of surfactants on the shape evolution of nanocrystals and open up avenues to the rational synthesis of nanocrystals with the thermodynamically unfavorable morphologies.

关键词： Au-Pd alloy Morphology Nanocrystal surfactant

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A surfactant-modified composite separator for high safe lithium ion battery

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Journal of Energy Chemistry 2023年第1期76卷 398-403,I0010页

作者： Botao Yuan Niandong He Yifang Liang Liwei Dong Jipeng Liu Jiecai Han Weidong He Yuanpeng Liu National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Center for Composite Materials and StructuresHarbin Institute of TechnologyHarbin 150080HeilongjiangChina MIIT Key Laboratory of Critical Materials Technology for New Energy Conversion and Storage School of Chemistry and Chemical EngineeringHarbin Institute of TechnologyHarbin 150080HeilongjiangChina Chongqing Research Institute Harbin Institute of TechnologyChongqing 401151China

Separators have been gaining increasing attention to improve the performance of lithium ion batteries(LIBs),especially for high safe and long cycle life.However,commercial polyolefin separators still face the problems of rapid capacity decay and safety issues due to the poor wettability with electrolytes and low thermal stability.Herein,a novel composite separator is proposed by introducing a surfactant of sodium dodecyl thiosulfate(SDS)into the polytetrafluoroethylene(PTFE)substrate with the binder of polyacrylic acid(PAA)through the suction filtration method.The introduction of PAA/SDS enhances the adsorption energy between PTFE substrate and electrolyte through density functional theory calculations,which improves wettability and electrolyte uptake of the separator significantly.The asachieved composite separator enables the LIBs to own high Li^(+)conductivity(0.64×10^(-3)S cm^(-1))and Li^(+)transference number(0.63),further leading to a high capacity retention of 93.50%after 500 cycles at 1 C.In addition,the uniform and smooth surface morphology of Li metal employed the composite separator after cycling indicates that the lithium dendrites can be successfully inhibited.This work indicates a promising route for the preparation of a novel composite separator for high safe LIBs.

关键词： Composite separator PTFE surfactant High safe Lithium ion batteries

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Extremely low friction on gold surface with surfactant molecules induced by surface potential

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Friction 2023年第4期11卷 513-523页

作者： Tianyang GAO Jinjin LI Weiqi WANG Jianbin LUO State Key Laboratory of Tribology Tsinghua UniversityBeijing 100084China

An extremely low friction state was observed on the gold surface induced by applying a specific negative potential in cationic surfactant solution.The friction force showed a remarkable reduction from 8.3 to 3.5×10−2 nN(reduced by 99.6%)with increasing the period of negative applied potential,and the final friction coefficient could reduce down to 3×10−4.The extremely low friction state was robust,and it also exhibited an excellent load bearing capacity,which cannot be damaged by a high load.Moreover,the extremely low friction state achieved under negative applied potential could keep stable even after the removal of potential,but failed in a short time,once a specific positive potential was applied.It was demonstrated that there was a stable electro-adsorption of surfactant molecules on the gold surface induced by applying a negative potential,leading to the formation of a bilayer structure on the gold surface.The hydration layers of the bilayer on the gold surface and micelles on the silica probe provided a shear plane with an extremely low shear strength,leading to the extremely low friction state on the gold surface.This study provides a method to achieve extremely low friction state by applied potential.

关键词： extremely low friction applied potential surfactant load bearing capacity

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Synthesis of Core-shell ZSM-5@ Ordered Mesoporous Silica by Tetradecylamine surfactant

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Journal of Wuhan University of Technology(Materials Science) 2024年第2期39卷 332-336页

作者：马扩彦 ZHAO Pengxian YI Hongyu 俞海军 ZHOU Moxi ZHANG Lingling LIU Yupu Chongqing Key laboratory of Scientific Utilization of Tobacco Resource Chongqing 400060China Department of Chemistry Laboratory of Advanced MaterialsFudan UniversityShanghai 200433China

A core-shell composite consisting of ZSM-5 zeolite as the core and ordered mesoporous silica as the shell was prepared by a surfactant-controlled sol-gel process and using tetradecylamine(TDA) as the template and Tetraethylorthosilicate(TEOS) as the silica precursor.The pores of the silica shell were found to be ordered and perpendicular to the crystal faces of the zeolite core.The thickness of the shell in the coreshell structured composite can be adjusted in the range of 20-90 nm,while the surface morphology and the pore size distribution were modified by changing the mass ratio of TEOS to zeolite.The composite molecular sieves have higher surface area for capturing molecules than ZSM-5,and with the increase of mesoporous shell layer,the ZSM-5@SiO_(2)-x composites show stronger adsorption capacity of butyraldehyde.However,when the shell thickness exceeds 90 nm,the adsorption capacity of butyraldehyde decreases instead.The composites have a huge potential for environmental applications.

关键词： core-shell composite tetradecylamine surfactant adsorption

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Effect of carbon material and surfactant on ink property and resulting surface cracks of fuel-cell microporous layers

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CHINESE JOURNAL OF CHEMICAL ENGINEERING 2024年第5期69卷 1-12页

作者： Chen, Zhekun Pan, Weitong Tang, Longfei Chen, Xueli East China Univ Sci & Technol Engn Res Ctr Resource Utilizat Carbon Containing W Minist Educ Shanghai 200237 Peoples R China East China Univ Sci & Technol Key Lab Pressure Syst & Safety Minist Educ Shanghai 200237 Peoples R China

Ensuring the consistency of electrode structure in proton-exchange-membrane fuel cells is highly desired yet challenging because of wide-existing and unguided cracks in the microporous layer (MPL). The first thing is to evaluate the homogeneity of MPL with cracks quantitatively. This paper proposes the homogeneity index of a full-scale MPL with an area of 50 cm2, which is yet to be reported in the literature to our knowledge. Besides, the effects of the carbon material and surfactant on the ink and resulting MPL structure have been studied. The ink with a high network development degree produces an MPL with low crack density, but the ink with high PDI produces an MPL with low crack homogeneity. The polarity of the surfactant and the non-polarity of polytetrafluoroethylene (PTFE) are not mutually soluble, resulting in the heterogeneous PTFE distribution. The findings of this study provide guidelines for MPL fabrication. (c) 2024 The Chemical Industry and Engineering Society of China, and Chemical Industry Press Co., Ltd. All rights reserved.

关键词： Proton-exchange-membrane fuel cell Microporous layer Crack density Crack homogeneity Polytetrafluoroethylene distribution surfactant GAS-DIFFUSION LAYER MICRO-POROUS LAYER CATALYST LAYER POLYTETRAFLUOROETHYLENE DISTRIBUTION PERFORMANCE IMPROVEMENT INTERFACIAL MORPHOLOGY WATER MANAGEMENT PTFE CONTENT POLYMER TRANSPORT

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