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Ultrathin polyamide nanofiltration membrane prepared by triazine-based porous organic polymer as interlayer for dye removal

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Chinese Journal of Chemical engineering 2023年第5期57卷 193-201页

作者： Yongbo Liu Zhihao Si Cong ren Hanzhu Wu Peng Zhan Yuqing Peng Peiyong Qin National Energy R&D Center for Biorefinery Beijing University of Chemical TechnologyBeijing 100029China College of Life Science and Technology Beijing University of Chemical TechnologyBeijing 100029China Beijing Key Laboratory of Membrane Science and Technology College of ChemicalEngineeringBeijing University of Chemical TechnologyBeijing 100029China

Separation membrane with high flux is generally encouraged in industrial application,because of the tremendous needs for decreasing membrane areas,usage costs and space *** most effective and direct method for obtaining the high flux is to decrease membrane ***(PA)nanofiltration membrane is conventionally prepared by the direct interfacial polymerization(IP)on substrate surface,and results in a thick PA *** this work,we proposed a strategy that constructing triazine-based porous organic polymer(TrZ-POP)as the interlayer to prepare the ultrathin PA nanofiltration ***-POP is firstly deposited on the polyethersulfone substrate,and then the formed TrZ-POP provides more adhesion sites towards PA based on its high specific surface *** chemical bonding between terminal amine group of TrZ-POP and the amide group of PA further improves the binding force,and strengthens the stability of PA *** importantly,the high porosity of TrZPOP layer causes the higher polymerization of initial PA owning to the stored sufficient amino monomer;and H-bonding interaction between amine groups of TrZ-POP and piperazine(PIP)can astrict the release of ***,IP process is controlled,and the thinnest thickness of prepared PA layer is only<15 *** expected,PA/TrZ-POP membrane shows a more excellent water flux of 1414 L·m^(-2)·h^(-1)·MPa^(-1)than that of the state-of-the-art nanofiltration membranes,and without sacrificing dye *** build of TrZPOP interlayer develops a new method for obtaining a high-flux nanofiltration membrane.

关键词： Polyamide Nanofiltration Interfacial polymerization Triazine-based porous organic polymer

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EBSd parameter assessment and constitutive models of crept Hr3C austenitic steel

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Journal of Iron and Steel research International 2023年第4期30卷 772-781页

作者： Jie Zhang Zheng-fei Hu Zhen Zhang Shanghai Key Laboratory for R&D and Application of Metallic Functional Materials School of Materials Science and EngineeringTongji UniversityShanghai 201804China School of Materials Science and Engineering Nanjing Institute of TechnologyNanjing 211167JiangsuChina

Creep damage and evolution of Hr3C steel at 650℃ were investigated using electron backscatter diffraction(EBSd),and EBSd-based parameter assessments were *** analyses show that the grain size is almost unchanged and no obvious texture formed after creep at different creep *** lowest proportion of low Σ coincidence site lattice grain boundaries under 150 MPa implies that the primary twin structures are preserved under the low stress level,while some twin structures evolved into general grain boundaries at the high creep *** main damage features of microcracks and cavities can be seen along the grain boundaries:the former emerged at higher stress levels,while the latter appeared at the lower stress level,and both were shown under medium *** contrast shows that the most severe creep damage is present at 170 *** implies that the creep mechanism differs distinctly under different stress levels,and the transition point is around 170 *** average misorientation is better to describe the local plastic deformation related to the strain distribution while grain reference orientation deviation describes the inhomogeneous strain *** lifetime prediction models including the isothermal method,Larson-Miller parameter method and Monkman–Grant relation were evaluated by the experimental data and literature data,and they are valid for predicting creep behavior.

关键词： Austenitic heat-resistant steel Creep damage Electron backscatter diffraction Creep constitutive model Creep lifetime prediction

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Preparation and Mechanical Properties of Bionic Carbon Fiber/Epoxy resin Composites Inspired by Owl Feather

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Journal of Bionic engineering 2025年第1期22卷 282-292页

作者： Zerun Yu Jiaan Liu Tian Yang Linyang Zhang Chunhua Hu Key Laboratory of Automobile Materials(Ministry of Education) College of Materials Science and EngineeringJilin UniversityChangchun130022China National Key Laboratory of Advanced Vehicle Integration and Control General R&D InstituteChina FAW Co.LtdChangchun130011China

Insufficient interfacial activity and poor wettability between fibers and matrix are the two main factors limiting the improvement of mechanical properties of Carbon Fiber reinforced Plastics(CFrP).Owl feathers are known for their unique compact structure;they are not only lightweight but also *** this study,an in-depth look at owl feathers was made and it found that owl feathers not only have the macro branches structure between feather shafts and branches but also have fine feather structures on the *** presence of these fine feather structures increases the specific surface area of the plume branches and allows neighboring plume branches to hook up with each other,forming an effective mechanical interlocking *** structures bring owl feathers excellent mechanical *** by the natural structure of owl feathers,a weaving technique and a sizing process were combined to prepare bionic Carbon Fiber(CF)fabrics and then to fabricate the bionic CFrP with structural characteristics similar to owl *** evaluate the effect of the fine feather structure on the mechanical properties of CFrP,a mechanical property study on CFrP with and without the fine feather imitation structure were *** experimental results show that the introduction of the fine feather branch structure enhance the mechanical properties of CFrP ***,the tensile strength of the composites increased by 6.42%and 13.06%and the flexural strength increased by 8.02%and 16.87%in the 0°and 90°sample directions,*** results provide a new design idea for the improvement of the mechanical properties of the CFrP,promoting the application of CFrP in engineering fields,such as automotive transportation,rail transit,aerospace,and construction.

关键词： Carbon fiber reinforced epoxy composites Owl feather Bionic feather structure Mechanical properties

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recent developments of anti-plasticized membranes for aggressive CO_(2)separation

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Green Chemical engineering 2023年第1期4卷 1-16页

作者： Yongchao Sun Xiaoyu Wang Xiangcun Li Wu Xiao Yan dai Canghai Ma Gaohong He State Key Laboratory of Fine Chemicals R&D Center of Membrane Science and TechnologySchool of Chemical EngineeringDalian University of TechnologyDalian116023China Panjin Institute of Industrial Technology Liaoning Key Laboratory of Chemical Additive Synthesis and SeparationDalian University of TechnologyPanjin124221China

membrane separation technology provides an effective alternative to mitigate the massive carbon emission with high carbon capture productivity and *** the context of operating membranes under high CO_(2)pressures allows increased separation productivity and reduced gas compression cost,which,however,often leads to CO_(2)induced plasticization,a key hurdle for current gas separation *** this review,we reviewed the latest development of membranes with anti-plasticization resistance,potentially suited for operation under high CO_(2)feed ***,the separation performance of polymeric membranes,inorganic membranes,and mixed matrix membranes under high CO_(2)feed pressures are *** to enhance CO_(2)induced plasticization of those membranes are also *** conclude the recent progress of membranes for high CO_(2)pressures with perspectives and an outlook for future development.

关键词： Carbon dioxide High feed pressure Plasticization Polymeric membranes Inorganic membranes Mixed matrix membranes

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Highly conductive and tough double-network hydrogels for smart electronics

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SmartMat 2024年第2期5卷 54-66页

作者： dong Zhang Yijing Tang Xiong Gong Yung Chang Jie Zheng Department of Chemical Biomolecularand Corrosion EngineeringThe University of AkronAkronOhioUSA School of Polymer Science and Polymer Engineering The University of AkronAkronOhioUSA R&D Center for Membrane Technology and Department of Chemical Engineering Chung Yuan Christian UniversityTaiwanChina

development and understanding of highly mechanically robust and electronically conducting hydrogels are extremely important for ever-increasing energy-based *** mixing/blending of conductive additives with hydrophilic polymer network prevents both high mechanical strength and electronic conductivity to be presented in polymer ***,we proposed a double-network(dN)engineering strategy to fabricate PVA/PPy dN hydrogels,consisting of a conductive PPy-PA network via in-situ ultrafast gelation and a tough PVA network via a subsequent freezing/thawing *** resultant PVA/PPy hydrogels exhibited superior mechanical and electrochemical properties,including electrical conductivity of~6.8 S/m,mechanical strength of~0.39 MPa,and elastic moduli of~0.1 *** further transformation of PVA/PPy hydrogels into supercapacitors,they demonstrated a high capacitance of~280.7 F/g and a cycle life of 2000 galvanostatic charge/discharge cycles with over 94.3%capacity retention at the current density of 2 mA/cm2 and even subzero temperatures of−20℃.Such enhanced mechanical performance and electronic conductivity of hydrogels are mainly stemmed from a synergistic combination of continuous electrically conductive PPy-PA network and the two interpenetrating dN *** in-situ gelation strategy is applicable to the integration of ionic-/electrical-conductive materials into dN hydrogels for smart-soft electronics,beyond the most commonly used PEdOT:PSS-based hydrogels.

关键词： conducting polymers double-network hydrogels smart electronics supercapacitors

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Solvent-resistant porous membranes using poly(ether−ether ketone): preparation and application

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Frontiers of Chemical science and engineering 2022年第11期16卷 1536-1559页

作者： Lixin Xing Jiaming Wang Xuehua ruan Gaohong He State Key Laboratory of Fine Chemicals R&D Center of Membrane Science and TechnologySchool of Chemical EngineeringDalian University of TechnologyDalian 116023China School of Chemical Engineering at Panjin Campus Dalian University of TechnologyPanjin 124221China

Poly(ether−ether ketone)(PEEK)is a linear aromatic macromolecule,which can form semi-crystalline aggregative status,allowing PEEK materials to have strong environment tolerance and excellent physicochemical *** materials have become a promising alternative to fabricate particular membranes used in extreme *** the past few decades,many researches and evolutions have emerged in membrane fabrication with PEEK materials and its applications for treating organic solvents and their mixtures;however,there are little systematic and comprehensive literature to summarize fabrication approaches,compile applications,and elaborate PEEK property-structure *** this review,the main approaches to fabricate PEEK-based membranes are illustrated concretely,including conventional thermal-induced and non-solvent-induced phase separation,and novel chemical-induced crystallization;the representative applications in ultrafiltration,nanofiltration and membrane contactor containing organic solvents are demonstrated ***,the mechanism to tune PEEK solubility in solvents,which can be achieved by altering monomers in synthesis processes or changing membrane preparation routes,is deeply ***,the existing problems and the future prospects are also *** review provides positive guidance for designing and fabricating membranes using PEEK and its derivative materials for task-specific applications in harsh conditions.

关键词： PEEK phase inversion solvent-resistant membrane nanofiltration membrane contactor

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Investigation into IgG/IgE binding capacity and gut microbiota of digestion products derived from glycated ovalbumin

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Food science and Human Wellness 2024年第6期13卷 3633-3641页

作者： Jihua Mao Yanhong Shao Hui Wang Jun Liu Zongcai Tu National R&D Center for Freshwater Fish Processing College of Life ScienceCollege of Chemistry and Chemical EngineeringJiangxi Normal UniversityNanchang 330022China State Key Laboratory of Food Science and Technology Nanchang UniversityNanchang 330047China

Gut microbiota plays an important role in food *** immunoglobulin G(IgG)/immunoglobulin E(IgE)binding capacity and human gut microbiota changes of digestion products derived from glycated ovalbumin(OVA)were *** digestion effectively destroyed the primary structure of glycated OVA,resulting in a significantly higher digestibility than gastric digestion,and more abundant peptides<3 ***,gastric and gastrointestinal digestion products have different fluorescence quenching and red shift of fluorescence peaks,and possess different conformational *** changes resulted in a decrease in 28.7%of the IgE binding capacity of gastrointestinal digestion products beyond that of ***,gastrointestinal digestion products of glycated OVA increased significantly the proportion of Subdoligranulum,Collinsella,and ***,gastrointestinal digestion products of glycated OVA altered human intestinal microbiota,reducing the risk of potential allergy.

关键词： Ovalbumin Glycation digestion IgG/IgE binding capacity Gut microbiota

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Ultralow-Vertical-Current Magnetization Switching Effect in an All Van der Waals 2d Heterostructure

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Chinese Physics Letters 2025年第2期42卷 239-248页

作者： Hao Wu Li Yang Gaojie Zhang Wen Jin Jie Yu Bichen Xiao Ahmed Annas Wenfeng Zhang Haixin Chang Center for Joining and Electronic Packaging State Key Laboratory of Material Processing and Die&Mold TechnologySchool of Materials Science and EngineeringHuazhong University of Science and TechnologyWuhan 430074China Wuhan National High Magnetic Field Center and Institute for Quantum Science and Engineering Huazhong University of Science and TechnologyWuhan 430074China Shenzhen R&D Center of Huazhong University of Science and Technology Shenzhen 518000China

The manipulation of magnetization and spin polarization using electrical currents represents a fundamental breakthrough in *** has formed the foundation for data storage and next-generation computing ***-transfer torque(STT)and spin-orbit torque(SOT)have emerged as prominent mechanisms in current-driven magnetization ***,these approaches typically require critical current densities in the range of 10^(6) to 10^(9) A·cm^(-2),resulting in significant heat generation during data writing ***,we report the discovery of an ultralow-vertical-current magnetization switching effect in a van der Waals ferromagnetic/ferroelectric heterostructure based on the modulation of the critical magnetic field(H_(C))using small vertical currents,with a critical current density as low as 1.81A·cm^(-2) and an average effective field(H_(eff)/J_(C))as high as 150.3mT·A^(-1)·cm^(2).This unique magnetization switching effect with ultralow-critical-vertical-current densities typically six to nine orders of magnitude lower than those of the STT and SOT provides a new transformative and viable pathway for developing next-generation spintronic and quantum technologies.

关键词： magnetization critical typically

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Modification of gelatin and photocured 3d-printed resin to prepare biomimetic phantoms for ultrasound-guided minimally invasive surgeries

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Polymer engineering and science 2023年第2期63卷 413-425页

作者： Chen, Chien-Hua Huang, Yi-Fan Chen, Po-Hao Hsu, Yu-Tung Jaw, Fu-Shan Ho, Ming-Hua Department of Biomedical Engineering National Taiwan University Taipei City Taiwan Department of Chemical Engineering National Taiwan University of Science and Technology Taipei City Taiwan R&D Center for Membrane Technology National Taiwan University of Science and Technology Taipei Taiwan

The main challenge of ultrasound-guided minimally invasive surgeries is to carry out treatments through small boreholes in the patient's body surface with sub-millimetric accuracy and facility offered by ultrasound instruments. Thus, the phantoms' biomimetic appearances, acoustic characteristics, and mechanical properties are essential for healthcare professionals. In this study, gelatin and 3d-printed photo-resin phantoms were developed for hard and soft tissues, respectively. Using glutaraldehyde (GA) and formaldehyde (FA) to crosslink gelatin phantoms, the mechanical strength, ultrasound velocity, acoustic impedance, needle insertion forces, and antiseptic periods were improved, and the addition of silica nanoparticles raised the acoustic impedance. For 3d-printed phantoms, the acoustic impedance ascended with hydrophilic polyethylene glycol diacrylate (PEGdA) oligomers. The additives applied in this study successfully made the gelatin and photo-resin phantoms more mimetic to muscle and bone tissues, allowing their application in preoperative preparations. © 2023 The Authors. Polymer engineering & science published by Wiley Periodicals LLC on behalf of Society of Plastics Engineers.

关键词： 3d printers

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Biaxial stretching of polytetrafluoroethylene in industrial scale to fabricate medical ePTFE membrane with node-fibril microstructure

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regenerative Biomaterials 2023年第1期10卷 1161-1177页

作者： Gang Wang Yusheng Feng Caiyun Gao Xu Zhang Qunsong Wang Jie Zhang Hongjie Zhang YongqiangWu Xin Li Lin Wang Ye Fu Xiaoye Yu deyuan Zhang Jianxiong Liu Jiandong ding State Key Laboratory of Molecular Engineering of Polymers Department of Macromolecular ScienceFudan UniversityShanghai 200438China R&D Center Lifetech Scientific(Shenzhen)Co.Ltd.Shenzhen 518057China R&D Center Lifevalve Medical Scientific Co.Ltd.Shenzhen 518057China

Expanded polytetrafluoroethylene(ePTFE)is promising in biomedical fields such as covered stents and plastic surgery owing to its excellent biocompatibility and mechanical ***,ePTFE material prepared by the traditional biaxial stretching process is with thicker middle and thinner sides due to the bowing effect,which poses a major problem in industrial-scale *** solve this problem,we design an olive-shaped winding roller to provide the middle part of the ePTFE tape with a greater longitudinal stretching amplitude than the two sides,so as to make up for the excessive longitudinal retraction tendency of the middle part when it is transversely *** as-fabricated ePTFE membrane has,as designed,uniform thickness and node-fibril *** addition,we examine the effects of mass ratio of lubricant to PTFE powder,biaxial stretching ratio and sintering temperature on the performance of the resultant ePTFE ***,the relation between the internal microstructure of the ePTFE membrane and its mechanical properties is *** stable mechanical properties,the sintered ePTFE membrane exhibits satisfactory biological *** make a series of biological assessments including in vitro hemolysis,coagulation,bacterial reverse mutation and in vivo thrombosis,intracutaneous reactivity test,pyrogen test and subchronic systemic toxicity test;all of the results meet the relevant international *** muscle implantation of the sintered ePTFE membrane into rabbits indicates acceptable inflammatory reactions of our sintered ePTFE membrane fabricated on industrial *** a medical-grade raw material with the unique physical form and condensed-state microstructure is expected to afford an inert biomaterial potentially for stent-graft membrane.

关键词： biomedical polymer medical-grade raw material expanded polytetrafluoroethylene olive roller polymer processing biaxial stretching

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