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Synthetic fungal melanin UV absorbers

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Science China Chemistry 2024年第9期67卷 3098-3110页

作者： Chao Wang Rong zhang Jianhua zhang xueqian zhang Hengjie zhang Huan Cao Zhen Yang Yiwen Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China Department of Radiology Huaxi MR Research CenterFunctional and Molecular Imaging Key Laboratory of Sichuan ProvinceNational Clinical Research Center for GeriatricsWest China HospitalSichuan UniversityChengdu 610041China

Agents with robust ultraviolet(UV)absorption capabilities play a vital role in safeguarding organisms and inorganic materials from UV ***,the synthetic procedures towards these UV absorbers are usually lengthy and complicated,accompanied by undesirable side reactions and the generation of toxic *** nature,allomelanin,a class of melanins variant found in melanized fungi near the Chernobyl nuclear power plant,plays crucial roles in the cell wall of melanized fungi,offering resistance to harsh external environments and promising UV resistance ***,allomelanin can be rapidly biosynthesized via the polymerization of 1,8-dihydroxynaphthalene in presence of enzymes in *** by this,we report here a green enzymatic polymerization strategy to efficiently and eco-friendly synthesize polydihydroxynaphthalene(PDHN)-based artificial allomelanin nanoparticles(NPs)with interesting *** calculations and experimental results demonstrated that the PDHN NPs exhibited excellent UVabsorption capacity,surpassing another widely used artificial melanin,polydopamine(PDA).Moreover,the light absorption mechanism of PDHN NPs was systematically elucidated for the first ***,the PDHN NPs were incorporated with polyvinyl alcohol(PVA)to create an anti-aging composite film with significantly enhanced UV shielding *** potential of these composite films in safeguarding plants from UV damage was meticulously ***,these PDHN NPs were first found to produce hydroxyl radicals(·OH)under UV irradiation,offering antibacterial properties that expand their potential applications.

关键词： melanin artificial allomelanin nanoparticles green synthesis UV absorption antibacterial

MoS2-based anode materials for lithium-ion batteries:Developments and perspectives

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Particuology 2024年第4期87卷 240-270页

作者： Lianyu Zhao Yishan Wang Chuncheng Wei Xiaoxiao Huang xueqian zhang Guangwu Wena School of Materials Science and Engineering Shandong University of TechnologyZibo255000China Schoolof Materials Science and Engineering Harbin Institute of TechnologyHarbin10001China

In recent years,significant progress has been achieved in the creation of innovative functional materials for energy storage and *** to their distinct physicochemical characteristics,ultrathin nanosheets composed of common layered transition metal sulfide materials(MoS2)have demonstrated promise as high-capacity anode materials for lithium-ion batteries(LIBs).Nevertheless,their practical application is severely limited by the tendency of monolayer nanosheets to restack due to strong van der Waals forces,dramatic volume changes during successive cycles,and low intrinsic *** research advances have shown that composite structures and nanowire morphologies with specific morphologies effectively overcome these *** paper reviews the recent research progress on molybdenum disulfide-based composites as anode materials for LIBs and discusses in detail the struc-tural characteristics of pure molybdenum disulfide and other composite forms of molybdenum *** addition,the phase engineering,defect engineering,and lithium storage mechanisms of molybdenum disulfide and the synthesis of molybdenum disulfide-based nanocomposites by different preparation methods are focused ***,we review the design(structure),recent developments,and challenges of novel anode materials and consider their electrochemical performance in Li-ion batteries.

关键词： Lithium-ion battery MoS_(2)-Based anode composites Synthesis methods Defect engineering Lithium storage mechanism

Cobalt phosphide-based composites as anodes for lithium-ion batteries:From mechanism,preparation to performance

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Particuology 2024年第5期88卷 11-31页

作者： Bo Lan Yishan Wang Jialei Lu Dongdong Liu Chuncheng Wei xueqian zhang Xiaoxiao Huang Guangwu Wen School of Materials Science and Engineering Shandong University of TechnologyZibo255000China School of Materials Science and Engineering Harbin Institute of TechnologyHarbin150001China School of Materials Science and Engineering Harbin Institute of TechnologyWeihai264209China

With the further requirements of electronic products and powered vehicles,the development of a new generation with low-voltage and high-capacity anode materials is crucial for lithium-ion batteries(LIBs).Transition metal phosphides,especially cobalt phosphide(CoP)composites,have become a research hotspot for LIBs anode materials in recent years due to their high theoretical specific capacity,low polarization,and suitable voltage *** review first systematically discusses the lithium storage mechanism and preparation methods of CoP in current ***,the applications of CoP anode materials in LIBs are categorically reviewed,including the composites of CoP with various types of carbon materials and ***,the challenges and future development directions of CoP anode materials are summarized to provide guidance for further improving the lithium storage performance of CoP and its practical applications.

关键词： CoP Composites Preparation Anodes Lithium-ion batteries

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摆脱数字迷思与强化历史性维度

中国文学批评 2024年第3期 172-178,192页

作者：张学谦苏州大学文学院苏州215123

在互联网技术的高速发展之下,中国网络文学批评逐步形成一种较为稳定的批评范式。它是以数字技术概念为起点、以互联网的数据现象为支撑的概念之批评。这种批评范式既遮蔽了网络文学接受主体的日常经验与体验,又导致网络文学批评忽略接... 详细信息

在互联网技术的高速发展之下,中国网络文学批评逐步形成一种较为稳定的批评范式。它是以数字技术概念为起点、以互联网的数据现象为支撑的概念之批评。这种批评范式既遮蔽了网络文学接受主体的日常经验与体验,又导致网络文学批评忽略接受主体的历史处境,使网络文学批评日趋成为新兴概念的游戏。网络文学批评应增强其历史性,重视接受主体的经验、体验与历史处境的连续性,从而逐步摆脱对概念的依赖,形成扎根于自身历史的批评理论与范式。

关键词：网络文学批评数字技术概念代际历史性

On-chip terahertz orbital angular momentum demultiplexer

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Photonics Research 2024年第5期12卷 1044-1054页

作者： XIAOHAN JIANG WANYING LIU QUAN XU YUANHAO LANG YIKAI FU FAN HUANG HAITAO DAI YANFENG LI xueqian zhang JIANQIANG GU JIAGUANG HAN WEILI zhang Center for Terahertz Waves College of Precision Instrument and Optoelectronics Engineeringand Key Laboratory of Optoelectronics Information and Technology(Ministry of Education)Tianjin UniversityTianjin 300072China Tianjin Key Laboratory of Low Dimensional Materials Physics and Preparing Technology School of ScienceTianjin UniversityTianjin 300072China Guangxi Key Laboratory of Optoelectronic Information Processing School of Optoelectronic EngineeringGuilin University of Electronic TechnologyGuilin 541004China School of Electrical and Computer Engineering Oklahoma State UniversityStillwaterOklahoma 74078USA

The terahertz regime is widely recognized as a fundamental domain with significant potential to address the demands of next-generation wireless *** parallel,mode division multiplexing based on orbital angular momentum(OAM)shows promise in enhancing bandwidth utilization,thereby expanding the overall communication channel *** this study,we present both theoretical and experimental demonstrations of an on-chip terahertz OAM *** device effectively couples and steers seven incident terahertz vortex beams into distinct high-quality focusing surface plasmonic beams,and the focusing directions can be arbitrarily *** proposed design strategy integrates space-to-chip mode conversion,OAM recognition,and on-chip routing in a compact space with subwavelength thickness,exhibiting versatility and superior performance.

关键词： demultiplexer momentum angular

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秦岭典型群落木本植物生物量影响因素研究

西北林学院学报 2024年第5期39卷 151-158页

作者：路健史蓓涵杨倩张雪倩闫琰西北农林科技大学林学院陕西杨凌712100 陕西秦岭森林生态系统国家野外科学观测研究站陕西杨凌712100

为明确秦岭群落生物量的影响因素及其驱动机制,并为合理提高秦岭群落生物量、准确评价秦岭森林生态系统功能以及秦岭地区森林可持续经营与管理提供理论依据,本研究以秦岭地区不同类型森林群落为对象,以97个典型群落类型501个样地中的26... 详细信息

为明确秦岭群落生物量的影响因素及其驱动机制,并为合理提高秦岭群落生物量、准确评价秦岭森林生态系统功能以及秦岭地区森林可持续经营与管理提供理论依据,本研究以秦岭地区不同类型森林群落为对象,以97个典型群落类型501个样地中的26560株活立木数据为基础,利用方差组分分析和多元线性回归模型,探究物种多样性和结构多样性对生物量的影响,分析降水、温度和土壤等环境因素与生物量之间的关系。结果表明:1)物种多样性、结构多样性和环境因素均影响着群落地上、地下和总生物量,其中物种多样性和结构多样性分别与生物量之间呈显著负相关和正相关。2)与物种多样性和环境因素相比,结构多样性对群落地上、地下和总生物量的作用效用最大,而环境因素的作用效应最小。3)不同环境因子对生物量影响存在差异,降水与生物量之间关系不显著,而土壤和温度与生物量有显著关系,且其中导电性与碳氮比能够促进生物量的累积,而温度季节性和等温性会抑制生物量的累积。

关键词：物种多样性结构多样性森林生物量线性回归模型

Superior performance for lithium-ion battery with organic cathode and ionic liquid electrolyte

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Journal of Energy Chemistry 2021年第1期30卷 28-32,I0002页

作者： xueqian zhang Wenjun Zhou Meng zhang Zhinan Yang Weiwei Huang State Key Laboratory of Metastable Materials Science and Technology Yanshan UniversityQinhuangdao 066004HebeiChina School of Environmental and Chemical Engineering Yanshan UniversityQinhuangdao 066004HebeiChina National Engineering Research Center for Equipment and Technology of Cold Strip Rolling Yanshan UniversityQinhuangdao 066004HebeiChina

Organic small structure quinones go with ionic liquids electrolytes would exhibit ultrastable electrochemical *** this study,calix[6]quinone(C6Q) cathode was matched with ionic liquid electrolyte Li[TFSI]/[PY13][TFSI](bis(trifluoromethane)sulfonimide lithium salt/N-methyl-N-pro pylpyrrolidinium bis(trifluoromethanesulfonyl)amide) to assemble lithium-ion batteries(LIBs).The electrochemical performance of LIBs was systematically *** capacity retention rates of C6Q through 1000 cycles at current densities of 0.2 C and 0.5 C were 70% and 72%,*** 5 C, the capacity was maintained at 190 mAh g^(-1) after 1000 cycles,and 155 mAh g^(-1) even after 10,000 cycles,comparable to inorganic *** work would give a big push to the practical process of organic electrode materials in energy storage.

关键词： Lithium-ion batteries Calixquinone Ionic liquids Superior performance

Stabilizing Co3O4 nanorods/N-doped graphene as advanced anode for lithium-ion batteries

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Frontiers of Materials Science 2021年第2期15卷 216-226页

作者： Yishan WANG xueqian zhang Fanpeng MENG Guangwu WEN School of Materials Science and Engineering Shandong University of Technology School of Materials Science and Engineering Harbin Institute of Technology Shandong Guiyuan Advanced Ceramic Company Limited

Tricobalt tetroxide（Co3O4） is one of the promising anodes for lithium-ion batteries（LIBs） due to its high theoretical capacity. However, the poor electrical conductivity and the rapid capacity decay hamper its practical application. In this work,we design and fabricate a hierarchical Co3O4nanorods/N-doped graphene（Co3O4/NG）material by a facile hydrothermal method. The nitrogen-doped graphene layers could buffer the volume change of Co3O4nanorods during the delithium/lithium process,increase the electrical conductivity, and profit the diffusion of ions. As an anode, the Co3O4/NG material reveals high specific capacities of 1873.8 m A·h·g-1after 120 cycles at 0.1 A·g-1as well as 1299.5 m A·h·g-1after 400 cycles at 0.5 A·g-1. Such superior electrochemical performances indicate that this work may provide an effective method for the design and synthesis of other metal oxide/N-doped graphene electrode materials.

关键词： Co3O4 graphene lithium-ion battery anode

All-optical active THz metasurfaces for ultrafast polarization switching and dynamic beam splitting

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Light(Science & Applications) 2018年第1期7卷 766-774页

作者： Longqing Cong Yogesh Kumar Srivastava Huifang zhang xueqian zhang Jiaguang Han Ranjan Singh Division of Physics and Applied Physics School of Physical and Mathematical SciencesNanyang Technological University21 Nanyang LinkSingapore 637371Singapore Centre for Disruptive Photonic Technologies The Photonics InstituteNanyang Technological University50 Nanyang AvenueSingapore 639798Singapore Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering Key Laboratory of Optoelectronic Information TechnologyMinistry of EducationTianjin University300072 TianjinPeople’s Republic of China

Miniaturized ultrafast switchable optical components with an extremely compact size and a high-speed response will be the core of next-generation all-optical devices instead of traditional integrated circuits,which are approaching the bottleneck of Moore’s *** have emerged as fascinating subwavelength flat optical components and devices for light focusing and holography ***,these devices exhibit a severe limitation due to their natural passive *** we introduce an active hybrid metasurface integrated with patterned semiconductor inclusions for all-optical active control of terahertz *** modulation of polarization states and the beam splitting ratio are experimentally demonstrated on a time scale of 667 *** scheme of hybrid metasurfaces could also be extended to the design of various free-space all-optical active devices,such as varifocal planar lenses,switchable vector beam generators,and components for holography in ultrafast imaging,display,and high-fidelity terahertz wireless communication systems.

关键词： polarization optical beam