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Click chemistry approach to functionalize two-dimensional macromolecules of graphene oxide nanosheets

Nano-Micro Letters 2010年第3期2卷 177-183页

作者： Liang Kou Hongkun He Chao Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University

A facile "click chemistry" approach to functionalize 2D macromolecules of graphene oxide nanosheets with poly(ethylene glycol) of different molecular weights,polystyrene,palmitic acid and various amino acids was ***,TGA,Raman spectroscopy,XPS,XRD,TEM,AFM and SEM were utilized to characterize the *** degree of functionalization was achieved on the flat surfaces of graphene oxide,affording polymer-grafted 2D brushes and amino acids-immobilized nanosheets,which show improved solubility in organic *** click chemistry strategy reported herein provides a facile and general method for functionalization of graphene oxide with macromolecules and desired biomolecules.

关键词： Graphene Click chemistry Chemical modification PEG Amino acids

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PREPARATION OF MICROPOROUS ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE (UHMWPE) BY THERMALLY INDUCED PHASE SEPARATION OF A UHMWPE/LIQUID PARAFFIN MIXTURE

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Chinese Journal of Polymer Science 2008年第6期26卷 653-657页

作者：沈烈 Department of Polymer Science and Engineering Zhejiang Universityand Key Laboratory of Macromolecular Synthesis and FunctionalizationMinistry of Education

Ultra-high molecular weight polyethylene (UHMWPE) with a microporous structure was prepared via thermally induced phase separation (TIPS).Liquid paraffin (LP) was used as a diluent in the preparation of microporous UHMWPE. Small angle laser light scattering (SALLS) and differential scanning calorimetry (DSC) were used to determine the phase separation temperatures,*** cloud points and the dynamic crystallization temperatures,*** was found that the cloudI points were coincident with the cryst...

关键词： Ultra high molecular weight polyethylene Thermally induced phase separation Liquid paraffin.

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Payne Effect and Weak Overshoot in Rubber Nanocomposites

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Chinese Journal of Polymer Science 2022年第1期40卷 85-92页

作者： Zhi-Yun Li Yi-Hu Song Qiang Zheng MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

Payne effect and its associated weak overshoot are of importance for understanding and regulating the softening of rubber nanocomposites under large amplitude ***,Payne effect in diverse filled vulcanizates is investigated for generalizing the common *** curves of strain amplitude dependent storage modulus are created with respect to microscopic strain amplitude of the matrix,revealing a matrix-dominated elastic nonlinearity being independent of type and dispersity of filler,crosslinking density and sol fraction of matrix and filler-rubber interfacial ***,carbonaceous fillers with higher affinity to the rubber matrices yield lower strain amplification and higher overshoot behavior in comparison with siliceous *** investigation would be illuminating for preparing rubber nanocomposites with optimized reinforcement and softening performances.

关键词： Vulcanizate nanocomposites Payne effect Weak overshoot

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Shear-thinning Catechol-modified Chitosan Hydrogel Loaded with Silver Nanoparticles for Endoscopic Submucosal Dissection

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Chinese Journal of Polymer Science 2024年第8期42卷 1147-1155页

作者： Wen-Jun Feng Yan-He Wu Xiao-Yang Liu Zheng-Ke Wang MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310058China

Shear-thinning hydrogels have emerged for endoscopic submucosal dissection,while wound intervention after surgery has rarely been ***,a catechol-modified chitosa n hydrogel with shear-thinning property was developed for simultaneously facilitating endoscopic submucosal dissection and postoperative wound *** from the shear-thinning and self-healing characteristics,the asprepared hydrogel showed easily endoscopic *** also performed very well as submucosal cushion,which could remain above 70%after injection for 120 min in ex vivo porcine large intestine *** fact,the cushion height of normal saline dramatically decreased to 46%of the initial height at 30 *** nanoparticles encapsulated into the network endowed the hydrogel with almost reached 100%antibacterial effect against *** and *** hemolysis ratio of the hydrogel was calculated to be as low as 0.8%.Combined with good hemocompatibility and cytocompatibility,the as-prepared hydrogel displayed much higher in vivo wound closu re and healing efficacy than normal *** results demonstrated the superiority of the shear-thinning chitosan hydrogel in facilitating clinical endoscopic submucosal dissection surgery.

关键词： Shear-thinning hydrogel Endoscopic mucosal dissection Wound healing Catechol-modified chitosan Silver nanoparticles

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Biological identity of nanomaterials:Opportunities and challenges

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Science China Chemistry 2013年第11期56卷 1533-1541页

作者： DENG Jun YU DaHai GAO ChangYou MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University

The emergence of nanoparticles(NPs)has attracted tremendous interest of the scientific community for decades due to their unique properties and potential applications in diverse areas,including drug delivery and *** novel NPs have been synthesized and used to reduce drug toxicity,improve bio-availability,prolong circulation time,control drug release,and actively target to desired cells or ***,clinical translation of NPs with the goal of treating particularly challenging diseases,such as cancer,will require a thorough understanding of how the NP properties influence their fate in biological systems,especially in *** efforts have been paid to studying the interactions and mechanisms of NPs and *** deliberately designed,the NPs in contact with biological fluids are rapidly covered by a selected group of biomolecules especially proteins to form a corona that interacts with biological *** this view,the recent development of NPs in drug delivery and the interactions of NPs with cells and proteins are *** understanding the protein-NP interactions,some guidelines for safety design of NPs,challenges and future perspectives are discussed.

关键词： nanoparticles carriers cellular uptake protein corona

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functionalization of carbon nanotubes and other nanocarbons by azide chemistry

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Nano-Micro Letters 2010年第3期2卷 213-226页

作者： Jin Han Chao Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringZhejiang University

Following the conventional carbon allotropes of diamond and graphite,fullerene,carbon nanotubes(CNTs) and graphene as 0D,1D and 2D graphitic macromolecules have been discovered recently in succession,declaring the unlimited potential of carbon-based nanomaterials and *** CNTs exhibit significant potential applications in advanced materials and other fields due to their extraordinary mechanical strength and electrical/thermal conductivity properties,their low solubility,poor wettability and bad dispersibility in common solvents and solid matrices have limited their processing and ***,the attempt to achieve wettable/processable CNTs by functionalization has attracted increasing attention in both scientific and industrial *** recent years,azide chemistry has been demonstrated as a powerful means to covalently modify *** consists of two major approaches:click chemistry and nitrene chemistry,which both involve the usage of various azide *** former one is based on highly reactive and stereospecifical Cu(I) catalyzed azide-alkyne cycloaddition reaction;the latter one is based on the electrophilic attack to unsaturated bonds of CNTs with nitrenes as reactive intermediates formed from thermolysis or photolysis of *** this mini-review paper,the azide chemistry to functionalize CNTs is highlighted and the corresponding functionalization routes to build CNT-based complex structures are also ***,covalent functionalizations of other graphitic nanomaterials such as fullerence and graphene,via azide chemistry,are commented briefly.

关键词： Carbon nanotubes functionalization Click chemistry Nitrene chemistry Nanocomposites Fullerene Graphene

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A TRILAYER DERMAL EQUIVALENT CONTAINING SILVER NANOPARTICLES WITH ENHANCED ANTIBACTERIAL PROPERTY

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Chinese Journal of Polymer Science 2009年第6期27卷 865-871页

作者：马列高长有 Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of Educationand Department of Polymer Science and EngineeringZhejiang University

A dermal equivalent having a trilayered structure was designed by combining a silver nanoparticles incorporated chitosan film with a bilayer collagen-chitosan/silicon membrane dermal equivalent(BDE).The silver nanoparticles prepared at different conditions were characterized by UV-Vis and transmission electron microscopy(TEM).The macroscopic sharp and the microstructure of the trilayer dermal equivalent(TDE) were also ***,the in vitro antibacterial property of TDE was evaluated by the antibacterial...

关键词： Scaffold Silver nanoparticles Antibacterial Dermal equivalent Skin regeneration

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INTERACTION BETWEEN THE SURFACE GLYCOSYLATED POLYPROPYLENE MEMBRANE AND LECTIN

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Chinese Journal of Polymer Science 2008年第3期26卷 363-367页

作者：徐志康 Institute of Polymer Science and Key Laboratory of Macromolecular Synthesis and Functionalization (Ministry of Education) Zhejiang UniversityHangzhou 310027China

A glycopolymer bearing glucose residues was tethered onto the surface of polypropylene microporous membrane by UV-induced graft polymerization ofα-allyl *** A (Con A),a glucose recognizing lectin,could be specifically adsorbed to the membrane *** the other hand,the membrane surface showed no recognition ability to another lectin peanut ***,the recognition complex between the glycosylated membrane surface and Con A could be inhibited by glucose and mannose solution.T...

关键词： Affinity membrane Protein separation Glycopolymer Glycosylated surface Garft polymerization Polypropylene microporous membrane

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Highly efficient and thermal stable guanidinium-based two-dimensional perovskite solar cells via partial substitution with hydrophobic ammonium

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Science China Chemistry 2019年第7期62卷 859-865页

作者： Yingzhu Zhang Jiehuan Chen Xiaomei Lian Weitao Yang Jun Li Shuoxun Tian Gang Wu Hongzheng Chen State Key Laboratory of Silicon Materials Key Laboratory of Macromolecular Synthesis and Functionalization (Ministry of Education)Department of Polymer Science and Engineering Zhejiang University

Layered two-dimensional(2D)perovskite solar cells(PVSCs)with a chemical formula of C(NH2)3(CH3NH3)3Pb3I10(n=3)have been fabricated through additive engineering,wherein stoichiometrically equivalent guanidinium(GA+)and methylammonium(MA+)serve as spacer *** crystallinity of the perovskite films is dramatically enhanced with proper amount of methylammonium thiocyanate(MASCN)added into the precursor *** addition,we substitute a small amount of MA+with hydrophobic phenylethylammonium(PEA+),which can passivate trap states of the perovskite *** a result,the open circuit voltage increases to 1.1 V and the best power conversion efficiency(PCE)of 10.12%is ***,superior thermal stability and balanced moisture stability of the PEA-substituted GA-based PVSCs are demonstrated,compared to the popular 3D MAPbI3and 2D PEA-based *** retain approximately 80%of the original PCE after 30 d at 20%relative humidity(RH),and 50%of the original PCE after 3200 min at 85°C without any *** work suggests a new route to achieve both heat and humidity stable PVSCs by simply mixing different spacer cations.

关键词： guanidinium-based 2D perovskite solar cells additive engineering PEA substitution stability

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An Unprecedented Efficiency with Approaching 21%Enabled by Additive‑Assisted Layer‑by‑Layer Processing in Organic Solar Cells

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Nano-Micro Letters 2025年第2期17卷 372-375页

作者： Shuai Xu Youdi Zhang Yanna Sun Pei Cheng Zhaoyang Yao Ning Li Long Ye Lijian Zuo Ke Gao Key Laboratory of Advanced Green Functional Materials College of ChemistryChangchun Normal UniversityChangchun 130032People’s Republic of China Shandong Provincial Key Laboratory for Science of Material Creation and Energy Conversion School of Chemistry and Chemical EngineeringShandong UniversityQingdao 266237People’s Republic of China College of Polymer Science and Engineering Sichuan UniversityChengdu 610065People’s Republic of China State Key Laboratory and Institute of Elemento‑Organic Chemistry Centre of Nanoscale Science and Technology and Key Laboratory of Functional Polymer MaterialsRenewable Energy Conversion and Storage Center(RECAST)College of ChemistryNankai UniversityTianjin 300071People’s Republic of China Institute of Polymer Optoelectronic Materials and Devices State Key Laboratory of Luminescent Materials and Devices South China University of TechnologyGuangzhou 510640People’s Republic of China Tianjin Key Laboratory of Molecular Optoelectronic Sciences School of Materials Science and EngineeringTianjin UniversityTianjin 300350People’s Republic of China State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and FunctionalizationDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027People’s Republic of China

Recently published in Joule,Feng Liu and colleagues from Shanghai Jiaotong University reported a record-breaking 20.8%power conversion efficiency in organic solar cells(OSCs)with an interpenetrating fibril network active layer morphology,featuring a bulk p-in structure and proper vertical segregation achieved through additive-assisted layer-by-layer *** optimized hierarchical gradient fibrillar morphology and optical management synergistically facilitates exciton diffusion,reduces recombination losses,and enhances light capture *** approach not only offers a solution to achieving high-efficiency devices but also demonstrates the potential for commercial applications of OSCs.

关键词： Organic solar cells Additive-assisted layer-by-layer processing Three-dimensional fibril morphology Bulk p-i-n structure Optical management

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