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Surface and Interface Engineering for Advanced Nanofiltration Membranes

Chinese Journal of Polymer Science 2022年第2期40卷 124-137页

作者： Bian-Bian Guo Cheng-Ye Zhu Zhi-Kang Xu Ministry of Education Key Laboratory of Macromolecular Synthesis and FunctionalizationKey Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang ProvinceDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

Nanofiltration has been attracting great attention in alleviating the global water crisis because of its high efficiency,mild operation,and strong *** decades,it remains a challenge to break the upper limit of performance and establish the formation-structureproperty relationship for nanofiltration *** feature article summarizes our recent progress in the preparation of high-performance thin-film composite(TFC)nanofiltration membranes,focusing on the mussel-inspired deposition method and the optimized interfacial polymerization(IP).By accelerating the oxidation of polydopamine and equilibrating the rate of aggregation and deposition processes,the mussel-inspired deposition method realizes the rapid and uniform formation of selective coatings or *** deposition systems endow the selective layer with rich chemical structures and easy post-functionalization,highlighting its potential in water *** for optimizing the conventional IP,the rapid polycondensation of amine and acid chloride groups is slowed down to enable the controllability of IP at the water-organic *** homogeneity and integrity of the TFC membranes are improved by constructing a uniform reaction platform and introducing a viscous medium to control the amine diffusion,which facilitates the water permeability and promotes the separation *** have proposed a series of practical strategies for improving TFC membranes and might provide more inspiration for other nanofiltration techniques.

关键词： Nanofiltration Thin-film composite membranes Mussel-inspired deposition Interfacial polymerization

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Understanding the Reinforcement and Dissipation of Natural Rubber Compounds Filled with Hybrid Filler Composed of Carbon Black and Silica

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Chinese Journal of Polymer Science 2017年第11期35卷 1436-1446页

作者：宋义虎 Ling-bin Zeng Qiang Zheng Ministry of Education key laboratory of Macromolecular synthesis and Functionalization Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang ProvinceZhejiang University Shanghai Aerospace System Engineering Institute

The performance of reinforced rubber compounds depends on the filler composition while the reinforcement and dissipation mechanisms still remain unclear. Herein linear and nonlinear dynamic rheological responses of carbon black/silica hybrid filler filling nature rubber compounds are investigated. The rheological contributions of dynamically retarded bulk phase and filler network are revealed to be crucial at high and low frequencies, respectively, and the bulk phase is shown to be of vital importance for the occurrence of nonlinear Payne effect at mediate frequencies. A framework for simultaneously solving reinforcement and dissipation varying with filler composition and content is suggested, providing a new perspective in understanding the filling effect for manufacturing high-performance rubber materials.

关键词： Filling Reinforcement Dissipation Rubber compounds Time-concentration superpositioning principle

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Porous Graphene Microflowers for High-Performance Microwave Absorption

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Nano-Micro Letters 2018年第2期10卷 81-91页

作者： Chen Chen Jiabin Xi Erzhen Zhou Li Peng Zichen Chen Chao Gao MOE key laboratory of Macromolecular synthesis and Functionalization Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials & Technologies of Zhejiang Province Zhejiang University Department of Mechanical Engineering Zhejiang University

Graphene has shown great potential in microwave absorption(MA) owing to its high surface area, low density,tunable electrical conductivity and good chemical *** fully realize graphenes& MA ability, the microstructure of graphene should be carefully addressed. Here we prepared graphene microflowers(Gmfs) with highly porous structure for high-performance MA filler material. The efficient absorption bandwidth(reflection loss B-10 dB) reaches 5.59 GHz and the minimum reflection loss is up to -42.9 dB, showing significant increment compared with stacked graphene. Such performance is higher than most graphene-based materials in the literature. Besides, the low filling content(10 wt%) and low density(40–50 mg cm^(-3))are beneficial for the practical applications. Without compounding with magnetic materials or conductive polymers,Gmfs show outstanding MA performance with the aid of rational microstructure design. Furthermore, Gmfs exhibit advantages in facile processibility and large-scale production compared with other porous graphene materials including aerogels and foams.

关键词： Graphene Microflowers Porous Microwave absorption

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FERROFERRIC OXIDE/CHITOSAN SCAFFOLDS WITH THREE-DIMENSIONAL ORIENTED STRUCTURE

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Chinese Journal of Polymer Science 2012年第3期30卷 436-442页

作者：胡巧玲 key laboratory of Macromolecular synthesis and Functionalization Ministry of EducationZhejiang University

A facile approach to construct ferroferric oxide/chitosan composite scaffolds with three-dimensional oriented structure has been explored in this research. Chitosan and ferroferric oxide are co-precipitated by using an in situ precipitation method, and then lyophilized to get the composite scaffolds. XRD indicated that Fe304 was generated during the gel formation process, and increasing the content of magnetic particles could destruct the crystal structure of chitosan. When the content of magnetic particles is lower than 10%, the layer-by-layer structure and wheel spoke structure are coexisting in the scaffolds. Increasing the content of magnetic particles, just layer-by-layer structure could be observed in the scaffolds. Ferroferric oxide particles were uniformly distributed in the matrix, the size of which was about 0.48 gm in diameter, 2 gm in length. Porosity of magnetic chitosan composite scaffolds is about 90%. When the ratio of ferroferric oxide to chitosan is 5/100, the compressive strength of the material is 0.4367 MPa, which is much higher than that of pure chitosan scaffolds, indicating that the layer-by-layer and wheel spokes complex structure is beneficial for the improvement of the mechanical properties of chitosan scaffolds. However, increasing the content of ferroferric oxide, the compressive strength of scaffolds decreased, because of the decreasing of chitosan crystallization and aggregation of magnetic particles as stress centralized body. Another reason is that the layer-by-layer and wheel spokes complex structure makes bigger contributions for the compressive strength than the layer-by-layer structure does. Three-dimensional ferroferric oxide/chitosan scaffolds could be used as hyperthermia generator system, improving the local circulation of blood, promoting the aggradation of calcium salt and stimulating bone tissue regeneration.

关键词： Chitosan Ferroferric oxide Scaffold Three-dimensional oriented structure.

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Heteroepitaxial growth of Au@Pd core–shell nanocrystals with intrinsic chiral surfaces for enantiomeric recognition

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Rare Metals 2024年第1期43卷 225-235页

作者： Feng-Xia Wu Feng-Hua Li Xia-Li Lv Qi-Xian Zhang Guo-Bao Xu Wen-Xin Niu State key laboratory of Electroanalytical Chemistry Changchun Institute of Applied ChemistryChinese Academy of SciencesChangchun 130022China Shaoxing Institute of Technology Shanghai UniversityShaoxing 312000China University of Science and Technology of China Hefei 230026China School of Materials Science and Engineering Shanghai UniversityShanghai 200436China zhejiang Institute of Advanced Materials Shanghai UniversityJiashan 314113China University of Chinese Academy of Sciences Beijing 100039China

Noble metal surfaces with intrinsic chirality serve as an ideal candidate for investigating enantioselective chemistry due to their superior chemical durability and high catalytic ***,significant advance has been made in synthesizing metal nanocrystals with intrinsic ***,the majority reports are limited to ***,through a heteroepitaxial growth strategy,the synthesis of metal nanocrystals with intrinsic chirality to palladium was extended for the first time and their application in enantioselective recognition was *** heteroepitaxial growth strategy allows for transferring the chirality of homochiral Au nanocrystals to Au@Pd core–shell *** employing the chiral Au@Pd nanocrystals as enantiomeric recognizing elements,a series of electrochemical sensors for chiral discrimination were *** optimal conditions,the peak potential between D-dihydroxyphenylalanine(D-DOPA)and L-dihydroxyphenylalanine(L-DOPA)is about 80 m V,and the peak current of D-DOPA is 2 times as much as that of L-DOPA,which enables the determination of the enantiomeric excess(EE,%)of ***,this report not only introduces a heteroepitaxial growth strategy to synthesize metal nanocrystals with intrinsic chirality,but also demonstrates the superior capability of integrating intrinsic chirality and catalytic properties into metal nanocrystals for chiral recognition.

关键词： Core–shell nanostructures Chirality transfer Electrochemical sensors Chiral recognition Chiroplasmonics

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Bio-inspired Spinach-leaf-based Au/ZnO Nanocomposites as Photocatalyst

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Journal of Bionic Engineering 2019年第6期16卷 1080-1091页

作者： Ping She Zhenning Liu Hang Sun Yinxing Shang Zhiyuan Li Zheng Qin Kongliang Xu Zhenxiang Yu key laboratory of Bionic Engineering(Ministiy of Education) College of Biological and Agricultural EngineeringJilin UniversityChangchun 130022China State key laboratory of Inorganic synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China key laboratory of bioorganic synthesis of zhejiang province College of Biotechnology and BioengineeringZhejiang University of TechnologyHangzhou 310014China Department of Respiratory Medicine the First Hospital of Jilin UniversityChangchun 130021China

A photocatalyst of Au/ZnO(s-Au/ZnO)has been prepared via an approach,which uses spinach leaves with in terconnected hierarchical structure as sacrificial biological *** resultant s-Au/ZnO has well maintained the physical characteristics of the spinach leaf and demonstrated superior photocatalytic performance as well as enhanced photocurrent generation ***,functional sacrificial agents(AgNO3,ammonium oxalate(AO)and tert-butyl alcohol(TBA))have been employed to quench electrons,holes and hydroxyl radicals respectively to identify the active species of photocatalytic reaction and to investigate the mechanism of photocatalytic *** facile method herein presented provides a convenient option for the preparation ofbio-inspired leaMike photocatalysts of ZnO-based nano-materials,holding potential applications in not only environmental purification but also solar-to-electric energy conversion.

关键词： bioinspiration spinach leaf,photocatalysis zinc oxide(ZnO) Au nanoparticle(AuNPs)

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Janus Poly(Vinylidene Fluoride)Membranes with Penetrative Pores for Photothermal Desalination

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Research 2020年第1期2020卷 534-544页

作者： Hao-Hao Yu Lin-Jiong Yan Ye-Cheng Shen Si-Yu Chen Hao-Nan Li Jing Yang Zhi-Kang Xu MOE key laboratory of Macromolecular synthesis and Functionalization and Key Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang ProvinceDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

Solar-driven desalination has been considered as a promising technology for producing clean water through an abundant and pollution-free energy *** is a critical challenge to reasonably design the porous morphology and the thermal management of photothermal membranes for enabling efficient energy conversion and water *** this work,a Janus poly(vinylidene fluoride)membrane was fabricated in combination of penetrative pore structure,asymmetric surface wettability with proper thermal management for high-efficiency solar *** open and directly penetrative pores achieved by the two-dimensional solvent freezing strategy are considered to provide direct pathways for water and vapor *** unique feature of hydrophobic upper layer/hydrophilic lower layer enables the photothermal membranes to self-float on the water surface and rapidly pump water from the bulk to the *** resulting Janus membrane exhibits a satisfactory light absorbance as high as 97%and a photothermal conversion efficiency of 62.8%under one-sun irradiation in a direct contact *** solar-to-vapor efficiency rises up to 90.2%with the assistance of a thermal insulator adopted *** the Janus membrane and the composite setup are able to work efficiently with a high stability in seawater desalination,and the concentration of ion in condensed water is reduced to below 1 ***,Janus membranes with directly penetrative pores and photothermal surfaces shine a light on the development of high-performance solar evaporators for the practical application in solar seawater desalination.

关键词： composite thermal pores

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Graphene fiber based supercapacitors:Strategies and perspective toward high performances

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Journal of Energy Chemistry 2018年第1期27卷 6-11页

作者： Qiuyan Yang Zhen Xu Chao Gao MOE key laboratory of Macromolecular synthesis and Functionalization.Department of Polymer Science and Engineering Key Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang Province.Zhejiang UniversityHangzhou 310027Zhejiang.China

Modern wearable electronics are thirsty for flexible, lightweight energy storage and supply devices. Flexible fiber-shaped supercapacitors, possess good flexibility, high power density, fast charging capability and long cycle life, becoming a promising option for wearable devices. The past decade has witnessed the emergence of graphene fiber based supercapacitors（GFSCs） as one of the most active vicinity in fiber-supercapactiors, for their excellent properties including high surface area, chemical stability, excellent electrical conductivity, lightweight and mechanical properties. In this perspective, we introduced the basic energy storage mechanisms of GFSCs, followed by the analysis in improving their overall performances, recent advances, and a conclusive discussion on the challenges and opportunities.

关键词： Graphene Fiber Two-dimensional materials Supercapacitors Energy storage

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Controllable Bending of Bi-hydrogel Strips with Differ ent ial Swelling

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Acta Mechanica Solida Sinica 2019年第5期32卷 652-662页

作者： Yi Wu Xingpeng Hao Rui Xiao Ji Lin Zi Liang Wu Jun Yin Jin Qian key laboratory of Soft Machines and Smart Devices of zhejiang province Department of Engineering MechanicsZhejiang UniversityHangzhou 310027China MOE key laboratory of Macromolecular synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China State key laboratory of Fluid Power and Mechatronic Systems Key Laboratory of 3D Printing Process and Equipment of Zhejiang ProvinceSchool of Mechanical EngineeringZhejiang UniversityHangzhou 310028China

Bi-hydrogel strips consisting of a highly swelling layer and a non-swelling layer are investigated in this study,in which the differential swelling capabilities and mismatch strain in the composite structure drive the strips into a bending configuration when being exposed to solvents.A modified analytical model originated from Timoshenko theory on bi-material beam is proposed to predict the swelling-induced bending shape of the bi-hydrogel strips,with explicit relations of bending curvature and mid-span deflection versus mismatch *** sets of experiments were performed to verify the analytical model and its solutions,in which the swellinginduced mismatch strain was systematically tuned by the selection of saline *** broad agreements bet ween the t heore tical and experimen tai results indicate that the modified analytical model can be used to guide the design of morphing elements by modulating layer-bylayer mismatches in gel composites to produce precise and complex shape transformations for practical applications.

关键词： Bi-hydrogel strip Hydrogel swelling Mismatch strain Shape morphing Analytical model

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Polysulfone Membranes via Thermally Induced Phase Separation

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Chinese Journal of Polymer Science 2017年第7期35卷 846-856页

作者： Hong-qing Liang Hao-nan Li Hao-hao Yu Yong-ting Zhou 徐志康 key laboratory of Macromolecular synthesis and Functionalization of the Ministry of Education Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China key laboratory of Adsorption and Separation Materials & Technologies of zhejiang province Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China

Polysulfone （PSF） membranes have gained great attention in the fields of ultrafiltration, microfiltration, and thin film composite membranes for nanofiltration or reverse osmosis. For the first time, it is proposed to fabricate PSF membranes via thermally induced phase separation （TIPS） process using diphenyl sulfone （DPSO2） and polyethylene glycol （PEG） as mixed diluent. DPSO2 is chosen as a crystallizable diluent, while PEG is considered in terms of molecular weight （Mw） and dosage. We systematically investigate the interactions between PSF, DPSO2 and PEG based on the simulation calculations and solubility parameter theory. It is inferred that DPSO2 has an excellent compatibility with PSF, and the addition of PEG results in the ternary system thermodynamically less stable and then facilitates its liquid-liquid （L-L） phase separation. SEM images indicate that cellular-like pores are obvious throughout the membrane when the PEG content in the mixed diluent is 25 wt%-35 wt%. We can facilely manipulate the pore size, water flux and mechanical properties of PSF membranes with the dosage of PEG-200, the Mw of PEG or the cooling rate. The successful application of TIPS can provide a new approach for structure manipulation and performance enhancement of PSF membranes.

关键词： Polysulfone membrane Pore structure Diphenyl sulfone Polyethylene glycol Thermally inducedphase separation

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