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Electrospun Poly(acrylonitrile-co-acrylic acid) Nanofibrous Membranes for Catalase Immobilization:Effect of Porphyrin Filling on the Enzyme Activity

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Chemical Research in Chinese Universities 2011年第2期27卷 339-344页

作者： KE Bei-bei WAN Ling-shu HUANG Xiao-jun XU Zhi-kang Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of EducationDepartment of Polymer Science and Engineering Zhejiang University Hangzhou 310027 P. R. China

Porphyrin-filled nanofibrous membranes were facilely prepared by electrospinning of the mixtures of poly（acrylonitrile-co-acrylic acid）（PANCAA） and porphyrins. 5,10,15,20-Tetraphenylporphyrin（TPP） and its metal-loderivatives（ZnTPP and CuTPP） were studied as filling mediators for the immobilization of redox enzyme. Results indicate that the introduction of TPP, ZnTPP and CuTPP improves the retention activity of the immobilized catalase. Among these three porphyrins, the ZnTPP-filled PANCAA nanofibrous membrane exhibits an activity retention of 93%, which is an exciting improvement. This improvement is attributed to both the strong catalase-porphyrin affinity and the possible facilitated electron transfer induced by the porphyrin as evidenced by quartz crystal microbalance （QCM） and fluorescence spectroscopy studies.

关键词： Enzyme immobilization Nanofibrous membrane Electrospinning Quartz crystal microbalance（QCM） Porphyrin

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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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A novel wet-spinning method of manufacturing continuous bio-inspired composites based on graphene oxide and sodium alginate

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Nano Research 2016年第3期9卷 735-744页

作者： Xiaozhen Hu Sangeetha Rajendran Yuansi Yao Zheng Liu Karthikeyan Gopalsamy Li Peng Chao Gao State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua University Shanghai 201620 China MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China

Nacre is a lightweight, strong, stiff, and tough material, which makes it a mimicking object for material design. Many attempts to mimic nacre by various methods resulted in the synthesis of artificial nacre with excellent properties. However, the fabrication procedure was very laborious and time-consuming due to the sequential steps, and only limited-sized materials could be obtained. Hence, a novel design enabling scalable production of high-performance artificial nacre with uniform layered structures is urgently needed. We developed a novel wet-spinning assembly technique to rapidly manufacture continuous nacre- mimic graphene oxide （GO, brick）-sodium alginate （SA, mortar） films and fibers with excellent mechanical properties. At high concentrations, the GO-SA mixtures spontaneously produced liquid crystals （LCs） due to the template effect of GO, and continuous, 6 m long nacre-like GO-SA films were wet-spun from the obtained GO-SA liquid crystalline （LC） dope with a speed of up to 1.5 m/min. The assembled macroscopic GO-SA composites inherited the alignment of the GO sheets from the LC phase, and their mechanical properties were investigated by a joint experimental-computational study. The tensile tests revealed that the maximum strength （0） and Young＇s modulus （E） of the obtained films reached 239.6 MPa and 22.4 GPa, while the maximum values of o and E for the fibers were 784.9 MPa and 58 GPa, respectively. The described wet-spinning assembly method is applicable for a large-scale and fast production of high-performance continuous artificial nacre.

关键词： continuous bio-inspired films sodium alginate graphene oxide wet-spinning method

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Recent Advances of Covalent Organic Frameworks in Chemical Sensing

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Chemical Research in Chinese Universities 2022年第2期38卷 339-349页

作者： XU Kai HUANG Ning Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of EducationState Key Laboratory of Silicon MaterialsDepartment of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027P.R.China

With the rapid development of reticular chemistry,an increasing number of covalent organic frameworks(COFs)have been designed and synthesized over the past *** to the large surface areas,numerous active sites,and high chemical stability,recent effects gradually were made to investigate the interaction with various small *** the reported application areas,sensorics is an attractive field,where COFs have exhibited tremendous potential and acquired high-performance sensitivity and selectivity due to their structural *** this review,we highlighted the recent progress of COFs as sensors for the detection of various analytes,mainly depending on the analysis of change of fluorescence *** basic principles of physics for fluorescence-based sensors were briefly discussed for better understanding of the relationship between structures and functions of ***,we reviewed various classes of small molecule analytes that have been successfully detected by COFs,including explosives,gases,humidity,metal ions,pH,and biological *** this work,we detailedly discussed the components of COFs,functional sites,and sensing performance in each sensing application,aiming to disclose their intrinsic *** review also concluded with several issues to be solved and provided the outlook for the future development direction for practical applications.

关键词： Covalent organic framework(COF) Sensing Fluorescence Porous polymer

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Metal Nanoclusters as Highly Efficient, Versatile Type-II Photoinitiators via Generating Radicals from Non-Conventional Hydrogen Donors

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Angewandte Chemie 2025年第12期137卷

作者： Zijie Chen Jin Tang Letian Zheng An Ren Prof. Liang Ma Prof. Qi Li Ministry of Education Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310058 China The State Key Laboratory of Fluid Power and Mechatronic Systems School of Mechanical Engineering Zhejiang University Hangzhou 310058 China

Development of highly efficient photocatalysis or photoinitiation systems that are applicable to various types of illumination source is critical to virtually all the light-driven applications. Here, we report a generalizable strategy to achieve highly sensitive, versatile photoinitiation systems based on the combination of metal nanoclusters with non-conventional hydrogen donors (co-initiators). Discovery of this type-II photoinitiation pathway in metal nanoclusters not only improves their two-photon initiation sensitivity by up to three-orders-of-magnitude, it further opens the door for metal nanoclusters to trigger the photopolymerization using the low-power UV light-emitting diodes. Different from molecular type-II photoinitiators, we found that the selection rules of hydrogen donors for metal nanoclusters are largely dependent on their ligand structures. More importantly, using electron paramagnetic resonance and mass spectroscopy, we for the first time demonstrate that the photoexcited metal nanoclusters can function as versatile hydrogen atom abstractors which generate various types of previously unreported thiyl and nitrogen-centered radicals. This finding indicates the broad opportunity of the future application of metal nanoclusters in light-driven organic synthesis and radical chemistry.

关键词： metal nanoclusters photocatalysis photoinitiators thiyl radicals nitrogen-centered radicals

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Corrigendum to "A dual lubricating and antibacterial hydrogel coating containing hyperbranched polylysine with excellent biocompatibility for surface modification of central venous catheters" [Chem. Eng. J. 509 (2025) 161402] (Chemical Engineering Journal (2025) 509, (S1385894725022247), (10.1016/***.2025.161402))

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Chemical Engineering Journal 2025年 513卷

作者： Shao, Bohui Wang, Xuelong Huang, Lei Liu, Xiaowei Wang, Liming Zheng, Weiwei Gao, Changyou MOE Key Laboratory of Macromolecular Synthesis and Functionalization International Research Center for X Polymers Department of Polymer Science and Engineering Zhejiang University Hangzhou310058 China Center for Healthcare Materials Shaoxing Institute Zhejiang University Shaoxing312099 China Zhejiang Haisheng Medical Device Company Co. Ltd. Shaoxing312099 China Dr. Li Dak Sum & Yip Yio Chin Center for Stem Cell and Regenerative Medicine Zhejiang University Hangzhou310058 China

The authors regret, Fig. 5 and Fig. 7 in addition with the captions of Fig. 4 and Fig. 6 in this article. The revised Fig. 5 mainly contained picture orientation modification of the DAPI staining image of Commercial group. The revised Fig. 7 mainly contained supplementary modification of the HE staining image of HP group. The revised captions of Fig. 4 and Fig. 6 mainly contained modification of statistical significance. These revisions do not influence on the conclusions of the study. Revised Fig. 5[Figure presented] Revised Fig. 7[Figure presented] Revised caption for Fig. 4: Fig. 4. Antibacterial and biocompatibility evaluation in vitro. (A,B) Colonies and statistical values of the non-adherent and adherent methicillin-resistant Staphylococcus aureus (MRSA) and Escherichia coli (E. coli) after incubation on different polyurethane sheet surfaces for 24 h (n = 5). (C) SEM images showing the morphology of MRSA and *** after being incubated on different catheter surfaces. (D) 3D CLSM images of mature MRSA biofilms on different catheter surfaces after incubation of 48 h using SYTO-9/PI staining. (E) Live/Dead staining of L929 and HUVEC after being incubated with extracts of different catheters for 24 h and 72 h, respectively, and (F) OD450 of L929 and HUVEC after being incubated with extracts of different catheters for 24 h and 72 h using CCK-8 assay (n = 5), respectively. (G) BSA adhesion on different catheter surfaces (n = 6). (H, I) The digital images and statistical results of hemolysis rates of different catheters after being incubated with diluted anticoagulant sheep blood at 37 °C for 1 h (n = 6). (J) Activated partial prothrombin time (APTT) of different catheter surfaces after being incubated with platelet-poor plasma at 37 °C for 5 min (n = 6). *, **, *** and **** represent p © 2025 Elsevier B.V.

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The Effects of Dispersed Phase Morphology Induced by Flow on the Bulk Viscosity of HDPE/PA Blends

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Chinese Chemical Letters 2006年第11期17卷 1515-1518页

作者： Hong Mei YANG Zhen Wei ZHANG Hart LI Qiang ZHENG Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 Key Laboratory of Macromolecular Synthesis and Functionalization Ministry of Education Zhejiang University Hangzhou 310027

The apparent shear viscosity （ηα） of a blend composed of 97 wt % high-density polyethylene （HDPE） and 3 wt % polyamide （PA-66） was measured by capillary rheometry at different shear rates, below, near and above the melting point of PA-66, i.e. 240℃, 260℃ and 280℃, respectively. At 260℃ and a high shear rate, ηα of the blend reduced abnormally; and at 260℃, was lower than that at 280℃. The images of etched surface of extrudate observed by the SEM showed different dispersed phase morphology, induced by flow at different temperatures. It is suggested that the formation of fibrillar morphology of dispersed phase is a key factor for the abnormal reduction of ηα for the HDPE/PA blend.

关键词： Viscosity reduction polyethylene polyamide droplet deformation.

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Supramolecular Micelles and Reverse Micelles Based on Cyclodextrin Polyrotaxanes

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Chinese Journal of Chemistry 2014年第1期32卷 73-77页

作者： Qiao Jin Gongyan Liu Jian Ji[*] MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou Zhejiang 310027 China Email: Jian Ji (jijian@***)[*]MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou Zhejiang 310027 China Tel.: 0086-0571-87953729 Fax: 0086-0571-87953729

A new supramolecular self-assembly approach to construct micelles and reverse micelles was ***-hydrophilic block copolymers poly(ethylene oxide)-b-poly(N-isopropylacrylamide) (PEO-b-PNIPAAm) was synthesized via atom transfer radical polymerization (ATRP) using PEO *** of the lower critical solution temperature (LCST) phase behavior of PNIPAAm,PEO-b-PNIPAAm block copolymers self-assembled to form PNIPAAm-core micelles at 40 ℃.The PNIPAAm-core micelles were disassembled to unimers when the temperature was decreased to 25 ℃.But the addition of α-cyclodextrins (α-CDs) could induce the formation of PNIPAAm-shell micelles because of the 'channel-type' crystallities induced by PEO/α-CDs *** assembly and disassembly procedure of micelles and reverse micelles were investigated by dynamic light scattering (DLS),X-ray diffraction (XRD),1H NMR and transmission electron microscopy (TEM).

关键词： cyclodextrin polyrotaxane reverse micelle supramolecular

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Dynamic dispersion stability of graphene oxide with metal ions

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Chinese Chemical Letters 2020年第6期31卷 1625-1629页

作者： Yinghui He Yingjun Liu Fan Guo Kai Pang Bo Fang Ya Wang Dan Chang Zhen Xu Chao Gao MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and EngineeringKey Laboratory of Adsorption and Separation Materials&Technologies of Zhejiang ProvinceZhejiang UniversityHangzhou 310027China

Graphene oxide(GO),an important chemical precursor of graphene,can stably disperse in aqueous surrounding and undergo aggregation as metal cations *** usual instability of GO with ions is caused by the shielding effect of ions and crosslinking between GO and ***,the dynamic stability of GO under ions exchange still remains ***,we investigated the dynamic dispersion stability of GO with metal ions and observed a redispersion behavior in concentrated Fe3+solution,other than permanent *** exchange with Fe3+ions drives the reversion of zeta(ζ)potential and enables the redispersion to individual GO-Fe3+complex sheets,following a dynamic electric double layer(EDL)*** is found that the specifically strong electrostatic shielding effect and coordination attraction between Fe3+and functional oxygen groups allows the selective redispersion of GO in concentrated Fe3+*** revealed dynamic dispersion stability complements our understanding on the dispersive stability of GO and can be utilized to fabricate graphene-metal hybrids for rich applications.

关键词： Graphene oxide Metal ions Redispersion Ion exchange Electric double layer Electrostatic shielding effect Coordination

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Active-layer evolution and （CH3NH3）3Bi2l9-based solar substrate efficiency improvement of cell on TiO2-deposited ITO

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Nano Research 2016年第10期9卷 2921-2930页

作者： Xinqian Zhang Gang Wu Zhuowei Gu Bing Guo Wenqing Liu Shida Yang Tao Ye Chen Chen Weiwei Tu Hongzheng Chen State Key Laboratory of Silicon Materials MOE Key Laboratory of Macromolecular Synthesis and Functionalization Department of Polymer Science and Engineering Zhejiang University Hangzhou 310027 China Department of Chemical Engineering Xinjiang Agriculture University Urumqi 830052 China

We systematically investigated the development of film morphology and crystallinity of methyl-ammonium bismuth （Ⅲ） iodide （MA3Bi2I9） through one- step spin-coating on TiO2-deposited indium tin oxide （ITO）/glass. The precursor solution concentration and substrate structure have been demonstrated to be critically important in the active-layer evolution of the MA3Bi2I9-based solar cell. This work successfully improved the cell efficiency to 0.42% （average： 0.38%） with the mesoscopic architecture of ITO/compact-TiOdmesoscopic-TiO2 （meso-TiO2）/ MA3Bi2I9/2,2＇,7,7＇-tetrakis（N,N-di-4-methoxyphenylamino）-9,9＇spiro-bifluorene （spiro-MeOTAD）/MoO3/Ag under a precursor concentration of 0.45 M, which provided the probability of further improving the efficiency of the BiB＋-based lead-free organic-inorganic hybrid solar cells.

关键词： methyl-ammonium bismuth （Ⅲ） iodide organic-inorganic hybridsolar cell TiO2-depostied indium tinoxide （FRO） substrate morphology and crystallinity precursor solution concentration

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