检索结果-南通市图书馆

Mechanically robust bamboo node and its hierarchically fibrous structural design

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2023年第2期10卷 199-211页

作者： Si-Ming Chen Si-Chao Zhang Huai-Ling Gao Quan Wang LiChuan Zhou Hao-Yu Zhao Xin-Yu Li Ming Gong Xiao-Feng Pan Chen Cui Ze-Yu Wang YongLiang Zhang HengAn Wu Shu-Hong Yu Department of chemistry Institute of Biomimetic Materials & Chemistry Anhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials & Chemistry Hefei National Research Center for Physical Sciences at the Microscale Institute of Energy Hefei Comprehensive National Science Center University of Science and Technology of China CAS Key Laboratory of Mechanical Behavior and Design of materials Department of Modern MechanicsEngineering and Materials Science Experiment CenterUniversity of Science and Technology of China institute of Innovative materials (I2M) Department of Materials Science and EngineeringDepartment of Chemistry Southern University of Science and Technology

Although short bamboo nodes function in mechanical support and fluid exchange for bamboo survival,their structures are not fully understood compared to unidirectional fibrous internodes.Here,we identify the spatial heterostructure of the bamboo node via multiscale imaging strategies and investigate its me chanical properties by multimodal mechanical tests.We find three kinds of hierarchical fiber reinforcement schemes that originate from the bamboo node,including spatially tightened interlocking,triaxial interconnected scaffolding and isotropic intertwining.These reinforcement schemes,built on porous vascular bundles,microfibers and more-refined twist-aligned nanofibers,govern the structural stability of the bamboo via hierarchical toughening.In addition,the spatial liquid transport associated with these multiscale fibers within the bamboo node is experimentally verified,which gives perceptible evidence for life-indispensable multidirectional fluid exchange.The functional integration of mechanical reinforcement and liquid transport reflects the fact that the bamboo node has opted for elaborate structural optimization rather than ingredient richness.This study will advance our understanding of biological materials and provide insight into the design of fiber-reinforced structures and biomass utilization.

关键词： biological materials bamboo node hierarchical fiber structural reinforcement functional integration

Layered oxide cathodes for sodium-ion batteries:microstructure design,local chemistry and structural unit

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science China chemistry 2024年第1期67卷 191-213页

作者： Ling-Yi Kong Han-Xiao Liu Yan-Fang Zhu Jia-Yang Li Yu Su Hong-Wei Li Hai-Yan Hu Yi-Feng Liu Ming-Jing Yang Zhuang-Chun Jian Xin-Bei Jia Shu-Lei Chou Yao Xiao institute for Carbon Neutralization College of Chemistry and Materials EngineeringWenzhou UniversityWenzhou 325035China

Because of the low price and abundant reserves of sodium compared with lithium,the research of sodium-ion batteries(SIBs)in the field of large-scale energy storage has returned to the research spotlight.Layered oxides distinguish themselves from the mains cathode materials of SIBs owing to their advantages such as high specific capacity,simple synthesis route,and environmental benignity.However,the commercial development of the layered oxides is limited by sluggish kinetics,complex phase transition and poor air stability.Based on the research ideas from macro-to micro-scale,this review systematically summarizes the current optimization strategies of sodium-ion layered oxide cathodes(SLOC)from different dimensions:microstructure design,local chemistry regulation and structural unit construction.In the dimension of microstructure design,the various structures such as the microspheres,nanoplates,nanowires and exposed active facets are prepared to improve the slow kinetics and electrochemical performance.Besides,from the view of local chemistry regulation by chemical element substitution,the intrinsic electron/ion properties of SLOC have been enhanced to strengthen the structural stability.Furthermore,the optimization idea of endeavors to regulate the physical and chemical properties of cathode materials essentially is put forward from the dimension of structural unit construction.The opinions and strategies proposed in this review will provide some inspirations for the design of new SLOC in the future.

关键词： sodium-ion batteries layered oxide cathodes microstructure design local chemistry structural unit

基于共价自适应网络的液晶弹性体:从分子设计到应用

在线全文

学校读者我要写书评

暂无评论

中国科学:材料科学(英文版) 2023年第8期66卷 3004-3021页

作者：祝阳阳徐镇田吴飞燕王猛谌烈 College of chemistry and engineering/institute of Polymers and Energy chemistry(IPEC) Nanchang UniversityNanchang 330031China institute of Advanced materials School of Chemistry and Chemical EngineeringSoutheast UniversityNanjing 211189China

液晶弹性体(LCEs)是一种刺激响应性材料,具有较大且可逆变形的能力,在软致动器、人造肌肉、光子器件和生物医学工程等领域引起了广泛的关注.与具有永久交联网络的传统液晶弹性体不同,具有共价自适应网络的液晶弹性体(CAN-LCEs)可以通过... 详细信息

液晶弹性体(LCEs)是一种刺激响应性材料,具有较大且可逆变形的能力,在软致动器、人造肌肉、光子器件和生物医学工程等领域引起了广泛的关注.与具有永久交联网络的传统液晶弹性体不同,具有共价自适应网络的液晶弹性体(CAN-LCEs)可以通过键交换反应引起的网络重排将多畴液晶弹性体编程为单畴液晶弹性体.此外,CAN-LCEs还具有焊接、自修复、回收、再加工或重新编程的能力.本文综述了CAN-LCEs的最新研究成果,详细讨论了基于各种类型的键交换反应的CAN-LCEs及其设计策略.同时,本文还介绍了共价自适应网络给LCEs带来的新功能,包括焊接、自愈、重塑、回收、重新编程等,并探讨了CAN-LCEs在各种领域的应用前景.最后,本文总结了这一新兴研究领域面临的挑战和潜在的未来发展方向.

关键词：刺激响应性液晶弹性体自适应网络生物医学工程交换反应交联网络光子器件 CAN

Multiscale cellulose-based fireproof and thermal insulation gel materials with water-regulated forms

在线全文

学校读者我要写书评

暂无评论

Nano Research 2023年第2期16卷 3379-3386页

作者： Chong-Han Yin Huai-Bin Yang Zi-Meng Han Kun-Peng Yang Zhang-Chi Ling Qing-Fang Guan Shu-Hong Yu Department of chemistry Institute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China institute of Innovative materials Department of Materials Science and EngineeringDepartment of ChemistrySouthern University of Science and TechnologyShenzhen 518055China

Different forms of construction materials(e.g.,paints,foams,and boards)dramatically improve the quality of life.With the increasing environmental requirements for buildings,it is necessary to develop a comprehensive sustainable construction material that is flexible in application and exhibits excellent performance,such as fireproofing and thermal insulation.Herein,an adjustable multiform material strategy by water regulation is proposed to meet the needs of comprehensive applications and reduce environmental costs.Multiform gels are constructed based on multiscale cellulose fibers and hollow glass microspheres,with fireproofing and thermal insulation.Unlike traditional materials,this multiscale cellulose-based gel can change forms from dispersion to paste to dough by adjusting its water content,which can realize various construction forms,including paints,foams,and low-density boards according to different scenarios and corresponding needs.

关键词： bioinspired multiscale structure nanocellulose water regulation gel material

Dual-radical-based molecular anisotropy and synergy effect of semi-conductivity and valence tautomerization in a photoswitchable coordination polymer

维普期刊数据库评论

在线全文

维普期刊数据库

学校读者我要写书评

暂无评论

National Science Review 2023年第6期10卷 200-214页

作者： Jing-Wei Dai Yu-Qin Li Zhao-Yang Li Hai-Tao Zhang Carmen Herrmann Shohei Kumagai Marko Damjanovi? Markus Enders Hiroyuki Nojiri Masakazu Morimoto Norihisa Hoshino Tomoyuki Akutagawa Masahiro Yamashita State Key Laboratory of Medicinal Chemical Biology Nankai University School of materials Science and engineering Nankai University institute of Inorganic and Applied chemistry University of Hamburg Department of chemistry Graduate School of Science Tohoku University institute of Inorganic chemistry University of Heidelberg institute for materials Research Tohoku University Department of chemistry Rikkyo University institute of Multidisciplinary Research for Advanced materials (IMRAM) Tohoku University

Organic radicals are widely used as linkers or ligands to synthesize molecular magnetic materials.However,studies regarding the molecular anisotropies of radical-based magnetic materials and their multifunctionalities are rare.Herein,a photoisomerizable diarylethene ligand was used to form{[CoⅢ(3,5-DTSQ·-)(3,5-DTCat2-)]2(6F-DAE-py2)}·3CH3CN·H2O(o-1·3CH3CN·H2O,6F-DAE-py2=1,2-bis(2-methyl-5-(4-pyridyl)-3-thienyl)perfluorocyclopentene),a valence-tautomeric(VT) coordination polymer.We directly observed dual radicals for a single crystal using high-field/-frequency(～13.3 T and～360 GHz) electron paramagnetic resonance(EPR) spectroscopy along the c-axis,which was further confirmed by angle-dependent Q-band EPR spectroscopy.Moreover,a conductive anomaly close to the VT transition temperature was observed only when probes were attached at the ab plane of the single crystal,indicative of synergy between valence tautomerism and conductivity.Structural anisotropy studies and density functional theory(DFT) calculations revealed that this synergy is due to electron transfer associated with valence tautomerism.This study presents the first example of dual-radical-based molecular anisotropy and charge-transfer-induced conductive anisotropy in a photoswitchable coordination polymer.

关键词： valence tautomerization charge transfer photo switching diradical coordination polymer

仿生低碳建筑材料:从沙塔蠕虫巢穴到新一代建筑

在线全文

同方期刊数据库

学校读者我要写书评

暂无评论

Science Bulletin 2024年第4期69卷 431-433页

作者：管庆方俞书宏 New Cornerstone Science Laboratory Department of ChemistryInstitute of Biomimetic Materials&ChemistryAnhui Engineering Laboratory of Biomimetic MaterialsDivision of Nanomaterials&ChemistryHefei National Research Center for Physical Sciences at the MicroscaleUniversity of Science and Technology of ChinaHefei 230026China Department of chemistry Department of Materials Science and EngineeringInstitute of Innovative MaterialsSouthern University of Science and TechnologyShenzhen 518055China

Traditional production process of cement-based building materials is always accompanied with massive carbon emissions and tremendous energy consumptions because of the calcination process under ultra-high temperature.

关键词： temperature 低碳建筑沙塔

具有改进的导热性能和力学性能的3D石墨烯/聚酰亚胺纤维框架

在线全文

学校读者我要写书评

暂无评论

Journal of Central South University 2022年第6期29卷 1761-1777页

作者：王先鹏胡爱平陈小华刘继磊李艳花李传议王涵唐群力 College of materials Science and engineering Hunan UniversityChangsha 410082China College of materials and chemistry engineering Hunan Institute of TechnologyHengyang 421002China

电子元器件的集成化和柔性器件的普及,对热管理材料的散热能力和综合力学性能提出了更高要求。本文通过预氧化和氨基化对聚酰亚胺(PI)纤维进行改性,获得表面活性较强的PDA@OPI纤维,将其与氧化石墨烯(GO)充分混合,形成GO-PDA@OPI混合浆... 详细信息

电子元器件的集成化和柔性器件的普及,对热管理材料的散热能力和综合力学性能提出了更高要求。本文通过预氧化和氨基化对聚酰亚胺(PI)纤维进行改性,获得表面活性较强的PDA@OPI纤维,将其与氧化石墨烯(GO)充分混合,形成GO-PDA@OPI混合浆料。随后采用蒸发、碳化、石墨化和机械压实等工艺,制备得到具有3D长程互连结构的G-g PDA@OPI复合薄膜。PDA@OPI纤维通过构成稳定的共价键将相邻的GO片“焊接”在一起,有利于石墨化样品中负载的传递和应力的耗散。同时,这种增强的界面相互作用还显著促进了GO和PI纤维在石墨化过程中的协同效应,以此提高石墨产品的结晶度。另外,PDA@OPI纤维还为热处理进程中因含氧基团分解而产生的气体提供逸出通道,从而使GO片的膨胀效应得到抑制。结果显示,当PDA@OPI纤维的添加量为30%时,G-g PDA@OPI复合薄膜的拉伸强度、极限应变率以及热导率分别达到78.5 MPa,19.4%,1028 W/(m·K),表现出优异的柔韧性和高回弹率。

关键词：石墨烯薄膜改性聚酰亚胺纤维聚多巴胺热导率力学性能

Aggregation-induced emission meets magnetic bistability: Synergy between spin crossover and fluorescence in iron(Ⅱ) complexes

在线全文

学校读者我要写书评

暂无评论

Chinese Chemical Letters 2023年第4期34卷 608-613页

作者： Yao Li Mohammad Khurram Javed Shu-Qi Wu Arshia Sulaiman Ying-Ying Wu Zhao-Yang Li Osamu Sato Xian-He Bu School of materials Science and engineering Nankai UniversityTianjin 300350China Institute for Materials Chemistry and Engineering Kyushu UniversityFukuoka 819-0395Japan

Luminescent spin crossover(SCO) materials have attracted significant interest owing to their potential applications in magneto-optical switches. However, the majority of previously reported FeII-based SCO complexes are adversely affected by fluorescence quenching in the solid-state. Here, we have constructed the first mononuclear FeIIcomplex decorated with an aggregation-induced emission(AIE) luminophore(i.e., tetraphenylethylene) that exhibits synergistic SCO and fluorescence behavior. Intriguingly, we obtained two types of crystals in different solvent systems, both displaying distinct magnetic bistability and fluorescence properties. The fluorescence intensity was observed to track the magnetic susceptibility, which confirmed that SCO and solid-state fluorescence operate synergistically. We introduce a novel approach for the construction of luminescent SCO compounds using an AIEgen as a luminophore, which leads to fluorescence emission in the solid-state, thus allowing us to study the synergy between SCO and fluorescence.

关键词： Magnetic bistability Spin crossover Luminescence Aggregation-induced emission Supramolecular structures

Robust YAG:Ce single crystal for ultra-high efficiency laser lighting

在线全文

学校读者我要写书评

暂无评论

Journal of Rare Earths 2022年第5期40卷 717-724,I0002页

作者： Yaqian Zhang Jianming Liu Yujie Zhang Haisheng Yang Yanxia Yu Qingyun He Xiaojuan Liang Yongfu Liu Weidong Xiang College of chemistry and materials engineering Wenzhou UniversityWenzhou 325035China Ningbo institute of materials Technology and engineering Chinese Academy of SciencesNingbo 315201China

At present,solid-state laser-driven lighting fabricated with blue laser diode(LD)and phosphor has been greatly developed in high-power lighting applications.The major obstacle is the luminescence saturation threshold of the fluorescence conversion material(YAG:Ce).In this work,we successfully prepared a series of high-quality and robust YAG:Ce single crystals.With high quantum efficiency(QE=92%),regular crystal structure and high thermal conductivity,the single-crystal has excellent ability to deal with high radiation flux and thermal accumulation generated by high power.Matching the single-crystal with the laser,the luminous efficiency up to 274 lm/W and saturation threshold of 12 W/mm^(2) were obtained.In addition,the influence of Ce doping concentration and sample processing conditions on the indicators in laser-driven white lighting was systematically studied.The results are of great significance and are believed to promote the development of solid-state laser-driven lighting.

关键词： YAG:Ce Single-crystal Laser diodes Luminous efficiency Saturation threshold Rare earths