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Efficient synthesis of bottle-brush polymers enabled by selective photoactivation strategy in NIR-induced PEt-RAFt polymerization

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Science China Chemistry 2024年第7期67卷 2353-2361页

作者： Hao Zha lin Cheng Zuowei Wang Chao Liu Chunyan Hong Department of Polymer Science and Engineering University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory for Physical Sciences at the Microscale University of Science and Technology of ChinaHefei 230026China

Bottle-brush polymers possessing densely grafted side chains have special properties that are distinct from linear ***,an efficient method for preparing bottle-brush polymers based on a selective photoactivation strategy in the photoinduced electron/energy transfer reversible addition-fragmentation chain transfer(PEt-RAFt)polymerization was developed.A methacrylate monomer 2-(2-(dodecylthiocarbonothioylthio)propionate)ethyl methacrylate(DtPEMA)containing a 2-(dodecylthiocarbonothioylthio)propionate(DtP)unit with a secondary R group was *** the unique selectivity of metal naphthalocyanine photocatalyst zinc 2,11,20,29-tetra-tert-butyl-2,3-naphthalocyanine(ZnttBNc)toward trithiocarbonate with tertiary R group,the PEt-RAFt polymerization of DtPEMA catalyzed by ZnttBNc was performed under near infrared(NIR)light(λ_(max)=760 nm)irradiation at room temperature,using 4-cyano-4-[(dodecylsulfanylthiocarbonyl)-sulfanyl]pentanoic acid(CDtPA)with a tertiary R group as a chain transfer agent(CtA).Proton nuclear magnetic resonance(1H NMR)and gel permeation chromatography(GPC)results demonstrated that the DtP units in the side chains were inert during the *** grafting poly(methyl acrylate)(PMA)from PDtPEMA via thermal-initiated RAFt polymerization,welldefined P(DtPEMA-g-PMA)bottle-brush polymers could be ***,the film prepared from the bottle-brush polymer exhibited excellent scratch self-healing property due to the interlocking of side chains.

关键词： bottle-brush polymers PEt-RAFt polymerization selective photoactivation scratch self-healing

Flexible and Robust Functionalized Boron Nitride/Poly(p‑Phenylene Benzobisoxazole)Nanocomposite Paper with High thermal Conductivity and Outstanding Electrical Insulation

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Nano-Micro Letters 2024年第2期16卷 423-437页

作者： lin tang Kunpeng Ruan Xi Liu Yusheng tang Yali Zhang Junwei Gu Chongqing Key Laboratory of Green Synthesis and Applications College of ChemistryChongqing Normal UniversityChongqing 401331People’s Republic of China Shaanxi Key Laboratory of Macromolecular Science and technology School of Chemistry and Chemical EngineeringNorthwestern Polytechnical UniversityXi’an 710072People’s Republic of China

With the rapid development of 5G information technology,thermal conductivity/dissipation problems of highly integrated electronic devices and electrical equipment are becoming *** this work,“high-temperature solid-phase&diazonium salt decomposition”method is carried out to prepare benzidine-functionalized boron nitride(m-BN).Subsequently,m-BN/poly(pphenylene benzobisoxazole)nanofiber(PNF)nanocomposite paper with nacremimetic layered structures is prepared via sol–gel film transformation *** obtained m-BN/PNF nanocomposite paper with 50 wt%m-BN presents excellent thermal conductivity,incredible electrical insulation,outstanding mechanical properties and thermal stability,due to the construction of extensive hydrogen bonds andπ–πinteractions between m-BN and PNF,and stable nacre-mimetic layered ***λ∥andλ_(⊥)are 9.68 and 0.84 W m^(-1)K^(-1),and the volume resistivity and breakdown strength are as high as 2.3×10^(15)Ωcm and 324.2 kV mm^(-1),***,it also presents extremely high tensile strength of 193.6 MPa and thermal decomposition temperature of 640°C,showing a broad application prospect in high-end thermal management fields such as electronic devices and electrical equipment.

关键词： Poly(p-phenylene-2,6-benzobisoxazole)nanofiber Boron nitride thermal conductivity Electrical insulation

Advanced cellulose-based materials toward stabilizing zinc anodes

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Science China Chemistry 2024年第5期67卷 1465-1484页

作者： Zhijiang Li Xiang Chen Rui Zhang taoyi Shen Jianchao Sun Zhongce Hu lin Li Lanlan Yang Hou-Yong Yu College of textile Science and Engineering(International Institute of Silk) Zhejiang Sci-Tech UniversityHangzhou 310018China State Key Laboratory for Modification of Chemical Fibers and Polymer Materials Donghua UniversityShanghai 201620China School of Environment and Material Engineering Yantai UniversityYantai 264005China Institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

Rechargeable aqueous zinc metal batteries(RAZMBs) have received extensive attention for large-scale energy storage systems due to the merits of Zn anodes, including moderate volumetric and gravimetric energy density, low redox potential, abundant reserve, low cost and impressive intrinsic safety. However, Zn anodes suffer from a series of adverse reactions(dendrite growth,hydrogen evolution, and surface passivation) resulting in low Coulombic efficiency, large polarization, and unsatisfied cycling performance, which inevitably hinder the wide application of RAZMBs. to address the above issues, cellulose-based materials are widely used for Zn anode protection because of their unique physical and chemical properties and other advantages such as biocompatibility, non-toxicity, degradability and easy extraction. In order to better understand the current progress in cellulosebased materials for the Zn anode protection, we have classified and summarized the relevant literatures. In this review, we summarize and elaborate the causes of poor reversibility for Zn anodes, including dendrite formation, hydrogen evolution, and surface passivation. Subsequently, the effective strategies(anode interfacial engineering, gel electrolyte optimization, and separator modification) of cellulose-based materials toward stabilizing Zn anodes are overviewed. In the end, the existing challenges and prospects of cellulose-based materials in Zn anode protection are summarized to shed light on future work.

关键词： Zn anode cellulose anode interfacial engineering gel electrolyte optimization separator modification

Catalytic anode surface enabling in situ polymerization of gel polymer electrolyte for stable Li metal batteries

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Nano Research 2024年第6期17卷 5216-5223页

作者： Guocheng Li Kang Liang Yuanjian Li Xiangrui Duan lin Fu Zhao Cai Zhaofu Zhang Jiangnan Dai Yongming Sun Wuhan National Laboratory for Optoelectronics Huazhong University of Science and TechnologyWuhan 430074China the Institute of technological Sciences Wuhan UniversityWuhan 430074China Faculty of Materials Science and Chemistry China University of Geoscience(Wuhan)Wuhan 430074China

Employing quasi-solid-state gel polymer electrolyte(GPE)instead of the liquid counterpart has been regarded as a promising strategy for improving the electrochemical performance of Li metal ***,the poor and uneven interfacial contact between Li metal anode and GPE could cause large interfacial resistance and electrochemical Li stripping/plating inhomogeneity,deteriorating the electrochemical ***,we proposed that the functional component of composite anode could work as the catalyst to promote the in situ polymerization reaction,and we experimentally realized the integration of polymerized-dioxolane electrolyte and Li/Li_(22)Sn_(5)/LiF composite electrode with low interfacial resistance and good stability by in situ catalyzation ***,the reaction kinetics and stability of metallic Li anode were significantly *** a demonstration,symmetric cell using such a GPE-Li/Li_(22)Sn_(5)/LiF integration achieved stable cycling beyond 250 cycles with small potential hysteresis of 25 mV at 1 mA·cm^(−2)and 1 mAh·cm^(−2),far outperforming the counterpart regular GPE on pure *** with lini0.5Co0.3Mn0.2O2,the full cell with the GPE-Li/Li_(22)Sn_(5)/LiF integration maintained 85.7%of the original capacity after 100 cycles at 0.5 C(1 C=200 mA·g^(−1)).Our research provides a promising strategy for reducing the resistance between GPE and Li metal anode,and realizes Li metal batteries with enhance electrochemical performance.

关键词： catalyzation polymerization interface resistance interfacial stability Li metal batteries electrochemical performance

Lactonization of dyes promoted by a coordination cage facilitates cavity-induced chromism as ion mobile detector

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Science China Chemistry 2024年第5期67卷 1554-1560页

作者： Liangliang Zhang Yu Liang Zhifeng Xiao Yuxuan Meng Jinyi Huang Xi lin Ji Li Hong-Cai Zhou Yu Fang Strait Institute of Flexible Electronics(SIFE Future Technologies)Fujian Normal University and Strait Laboratory of Flexible Electronics(SLoFE)Fuzhou 350017China State Key Laboratory of Chemo/Bio-Sensing and Chemometrics College of Chemistry and Chemical EngineeringHunan UniversityChangsha 410082China Department of Chemistry Texas A&M UniversityCollege StationTexas 77842-3012USA State Key Laboratory of Structural Chemistry Fujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Frontiers Science Center for Flexible Electronics(FSCFE) MIIT Key Laboratory of Flexible Electronics(KLoFE)Northwestern Polytechnical UniversityXi’an 710072China

Dye molecules often change colors(so-called “chromism”) according to the environment variation. However, they are rarely induced by a catalytic amount of cavity. through encapsulation in the cavity of a porous coordination cage(PCC-2), Rhodamine B(1) is transformed from red quinonoid form(1q) into colorless lactone form(1l) in aprotic polar solutions. the μ4-OH groups in the cavity of PCC-2 are shown to stabilize the uncommon zwitterion intermediate(1z), followed by converting to 1l, thus accelerating the equilibrium. the chromism is catalyzed by 0.25 mol% of PCC-2, and the reaction rate is improved by 80,400times. 1@PCC-2 can be further fabricated to a sol-gel that exhibits ion recognition properties. the resulting encapsulation and stabilization of an unconventional intermediate by a catalytic amount of the coordination cage provides fundamental insights into molecular isomerization and has potential use in chemical sensing.

关键词： porous coordination cage Zwitterion intermediate cavity Rhodamine B chromism

Photosynthetic co-culture system of algae and human umbilical vein endothelial cells:the effect on alleviating hypoxia and hypoxia/reoxygenation injury

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Biosurface and Biotribology 2024年第2期10卷 76-88页

作者： Donghu lin Yuanyuan Chen Xinyu tao Xin Che Shiyu Li Shiyu Cheng Shuxin Qu Institute of Biomedical Engineering College of MedicineSouthwest Jiaotong UniversityChengduSichuanChina Key Laboratory of Advanced technologies of Materials Ministry of Education School of Materials Science and EngineeringSouthwest Jiaotong UniversityChengduSichuanChina School of Life Science and Engineering Southwest Jiaotong UniversityChengduSichuanChina

It is a developed photosynthetic co-culture system to alleviate the hypoxia and hypoxia/reoxygenation(H/R)-injured human umbilical vein endothelial cells(HUVECs).the algae,Chlorella vulgaris,were encapsulated to slow their growth while not affecting the photosynthetic oxygen-producing capacity by Layer-by-layer(LbL)using gelatin and sodium alginate as the positive and negative charges materials,***,the photosynthetic co-culture system of HUVECs and self-oxygenating alginate hydrogel(Algae-gel)was constructed in which the optimal ratios between algae and HUVECs were 5:1 and 20:1 for a 2D or 3D co-cultured manner,*** indicated that the 3D cocultured manner of HUVECs needed more O_(2) by the production of algae than it did in a 2D co-cultured *** co-cultured Algae-gel could alleviate hypoxia and the oxidative stress injury of hypoxia and hypoxia/reoxygenation(H/R)-treated HUVECs in the proliferation,intracellular ROS and cellular migratory *** addition,the Alga.gel could downregulate the expression of hypoxia-inducible factors 1α(HIF-1α)and vascular endothelial growth factor(VEGF)of hypoxia and H/R-injured HUVECs due to the improvement of hypoxia and H/R *** photosynthetic co-culture system could offer a promising approach for repairing hypoxia and H/R-injured cells or tissue by providing safe and stable O_(2).

关键词： biomaterials biomedical application bionic design regenerative medicine self-assembly tissue engineering

the marriage of immunomodulatory,angiogenic,and osteogenic capabilities in a piezoelectric hydrogel tissue engineering scafold for military medicine

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Military Medical Research 2024年第3期11卷 323-344页

作者： Ping Wu lin Shen Hui-Fan Liu Xiang-Hui Zou Juan Zhao Yu Huang Yu-Fan Zhu Zhao-Yu Li Chao Xu Li-Hua Luo Zhi-Qiang Luo Min-Hao Wu lin Cai Xiao-Kun Li Zhou-Guang Wang Key Laboratory of Imaging Diagnosis and Minimally Invasive Intervention Research the Fifth Affiliated Hospital of Wenzhou Medical UniversityLishui 323000ZhejiangChina Oujiang Laboratory(Zhejiang Lab for Regenerative Medicine Vision and Brain Health)School of Pharmaceutical ScienceWenzhou Medical UniversityWenzhou 325000ZhejiangChina Department of Spine Surgery and Musculoskeletal tumor Zhongnan Hospital of Wuhan UniversityWuhan 430071China National Engineering Research Center for Nanomedicine College of Life Science and TechnologyHuazhong University of Science and TechnologyWuhan 430074China Department of Overseas Education College Jimei UniversityXiamen 361021FujianChina School and Hospital of Stomatology Wenzhou Medical UniversityWenzhou 325035ZhejiangChina

Background:Most bone-related injuries to grassroots troops are caused by training or accidental *** establish preventive measures to reduce all kinds of trauma and improve the combat effectiveness of grassroots troops,it is imperative to develop new strategies and scafolds to promote bone ***:In this study,a porous piezoelectric hydrogel bone scafold was fabricated by incorporating polydopamine(PDA)-modified ceramic hydroxyapatite(PDA-hydroxyapatite,PHA)and PDA-modified barium titanate(PDABatiO_(3),PBt)nanoparticles into a chitosan/gelatin(Cs/gel)*** physical and chemical properties of the Cs/gel/PHA scafold with 0–10 wt%PBt were *** and animal experiments were performed to characterize the immunomodulatory,angiogenic,and osteogenic capabilities of the piezoelectric hydrogel scafold in vitro and in ***:the incorporation of BatiO_(3) into the scafold improved its mechanical properties and increased self-generated *** to their endogenous piezoelectric stimulation and bioactive constituents,the prepared Cs/gel/PHA/PBt hydrogels exhibited cytocompatibility as well as immunomodulatory,angiogenic,and osteogenic capabilities;they not only effectively induced macrophage polarization to M2 phenotype but also promoted the migration,tube formation,and angiogenic differentiation of human umbilical vein endothelial cells(HUVECs)and facilitated the migration,osteodifferentiation,and extracellular matrix(ECM)mineralization of MC3t3-E1 *** in vivo evaluations showed that these piezoelectric hydrogels with versatile capabilities significantly facilitated new bone formation in a rat large-sized cranial injury *** underlying molecular mechanism can be partly attributed to the immunomodulation of the Cs/gel/PHA/PBt hydrogels as shown via transcriptome sequencing analysis,and the PI3K/Akt signaling axis plays an important role in regulating macrophage M2 ***:the piezoelectric Cs/gel/PHA/PBt hy

关键词： Piezoelectric hydrogel tissue engineering scafold Immunomodulation Angiogenesis Osteogenic differentiation

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生物质基柔性超级电容器研究进展

精细化工 2024年第4期41卷 719-727页

作者：张萱林琳张健刘静北华大学吉林省木质材料科学与工程重点实验室吉林吉林132013 北华大学理学院吉林吉林132013

随着可穿戴设备的发展及公众环保意识的提升,开发高性能兼绿色经济型的柔性电化学储能器件已成为研究热点。以生物质为前驱体制备性能优异的储能材料,可以显著降低生产成本,实现碳资源的可持续利用,具有极大的发展潜力和实际应用价值。... 详细信息

随着可穿戴设备的发展及公众环保意识的提升,开发高性能兼绿色经济型的柔性电化学储能器件已成为研究热点。以生物质为前驱体制备性能优异的储能材料,可以显著降低生产成本,实现碳资源的可持续利用,具有极大的发展潜力和实际应用价值。该文介绍了柔性超级电容器的电极材料、柔性隔膜和各种组装方式,分析了木基、纤维素凝胶基、纸基以及生物质废料电极材料的特点和优势,阐述了生物质基柔性隔膜研究现状,包括纤维素纸隔膜和生物隔膜;此外,介绍了叠层型(三明治型)、叉指型(微型叉指化)、纤维型(线型)柔性超级电容器,并对比了不同组装方式的柔性超级电容器在性能上的差异;最后分析了生物质材料用于柔性超级电容器面临的挑战,对柔性器件未来发展方向进行了展望。

关键词：生物质柔性电极材料隔膜组装方式

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Heat source recognition sensor mimicking the thermosensation function of human skin

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the Innovation 2024年第5期5卷 84-90,83页

作者： Wenting Sun Pengxiang Zhang Xinyi lin Yupeng Wang Shuaihua Wang Bin Yang Zijian Zheng Weishu Liu Department of Materials Science and Engineering Southern University and Science and TechnologyShenzhen 518055China Guangdong Provincial Key Laboratory of Functional Oxide Materials and Devices Southern University of Science and TechnologyShenzhen 518055China School of Fashion and textiles The Hong Kong Polytechnic UniversityHong Kong SARChina Department of Applied Biology and Chemical technology The Hong Kong Polytechnic UniversityHong Kong SAR 999077China Research Institute for Intelligent Wearable Systems(RI-IWEAR) The Hong Kong Polytechnic UniversityHong Kong SAR 999077China Research Institute for Smart Energy(RISE) The Hong Kong Polytechnic UniversityHong Kong SAR 999077China

the human skin maintains a comfortable and healthy somatosensory state by sensing different aspects of the thermal environment,including temperature value,heat source,energy level,and ***,state-of-the-art thermosensors only measure basic temperature values,not the full range of the thermosensation function of human ***,we propose a heat source recognition(hsr)sensor of poly(butyl acrylate)-lithium bis(n-fluoroalkylsulfonyl)imide(PBA-Li:nFSI;n=1,3,5),which enables response to temperature,pressure,and proximity stimulus signals based on the relaxation behavior of the ionic gel and distinguished between different types of heat sources(i.e.,radiation,convection,and conduction).the hsr sensor was integrated into a prosthetic limb covered by an e-skin with isothermal regulation,and experiments with a robot showed that it could achieve human-like thermosensation function,recognizing multidimensional information about thermal environments,such as temperature value,comfort level,and heat source *** work deeply mimics the human body’s thermosensation function and provides a reliable solution for the development of bionic e-skin for intelligent robots and prosthetics.

关键词： robot function source