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Ultrastrong room-temperature phosphorescence in cucurbituril-mediated crystalline supramolecules for ratiometric detection of phenethylamine

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science China Chemistry 2025年第6期68卷 2671-2679页

作者： Qingyu Niu Yingxiang Ye Lingna Su Xu He Zhiqiang Li Yu Liu School of Chemical Engineering and Technology Hebei University of Technology Fujian Provincial Key Laboratory of Polymer Materials College of Chemistry and Materials Science Fujian Normal University Key Laboratory of Advanced Energy Materials Chemistry (Ministry of Education) Nankai University College of Chemistry State Key Laboratory of Elemento-Organic Chemistry Nankai University

It is a great challenge to modulate purely organic fluorescence-phosphorescence dual emission in aqueous solution because the excited singlet and triplet states are in competition with each other. Herein, we report a crystalline 1:2 host-guest formed by selfassembly of 4-(4-bromophenyl)-pyridinium derivatives and cucurbit[8]uril, in which a rigid environment rich in weak interactions is directly demonstrated. Due to the inhibition of non-radiative transition and stabilization of triplet exciton in the crystalline environment, the crystalline inclusion complex exhibits ultralong room-temperature phosphorescence lifetime of3.21 ms with an room-temperature phosphorescence(RTP) quantum yield up to 16.29%. Interestingly, the crystalline 1:2 hostguest complex demonstrates the ability of rapid identification and sensitive fluorescence-phosphorescence ratiometric detection behavior toward phenethylamine, a drug analogue, with a limit of detection as low as 27.5 n M. We believe that this study will undoubtedly broaden the utilizing scopes of RTP and offer a novel avenue for psychoactive substances monitoring.

关键词： room-temperature phosphorescence cucurbituril host-guest complex crystalline ratiometric detection

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Microstructural evolution during the progressive transformation-induced plasticity effect in a Fe-0.1C-5Mnmedium manganese steel

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International Journal of Minerals,Metallurgy and materials 2025年第2期32卷 369-379页

作者： Mei Zhang Wenhao Li Yangfei Chen Yang Jiang Xiaofei Guo Han Dong School of Materials Science and Engineering Shanghai UniversityShanghai 200444China State Key Laboratory of Advanced Special Steel Shanghai UniversityShanghai 200444China

The microstructural evolution of a cold-rolled and intercritical annealed medium-Mn steel(Fe-0.10C-5Mn)was investigated during uniaxial tensile ***-situ observations under scanning electron microscopy,transmission electron microscopy,and X-ray diffraction analysis were conducted to characterize the progressive transformation-induced plasticity process and associated fracture initiation *** findings were discussed with the local strain measurements via digital image *** results indicated that Lüders band formation in the steel was limited to 1.5%strain,which was mainly due to the early-stage martensitic phase transformation of a very small amount of the less stable large-sized retained austenite(RA),which led to localized stress concentrations and strain hardening and further retardation of *** small-sized RA exhibited high stability and progressively transformed into martensite and contributed to a stably extended Portevin-Le Chatelier *** volume fraction of RA gradually decreased from 26.8%to 8.2%prior to *** the late deformation stage,fracture initiation primarily occurred at the austenite/martensite and ferrite/martensite interfaces and the ferrite phase.

关键词： medium-Mn steel retained austenite progressive transformation-induced plasticity effect local strain fracture initiation

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Complexions-Dominated Plastic Transmission and Mechanical Response in Cu-Based Nanolayered Composites

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金属学报（英文版） 2025年第4期38卷 597-613页

作者： Zhe Yan Qi An Lichen Bai Ruifeng Zhang Mingyu Gong Shijian Zheng Tianjin Key Laboratory of Materials Laminating Fabrication and Interface Control Technology School of Materials Science and EngineeringHebei University of TechnologyTianjin 300130China School of Materials Science and Engineering Beihang UniversityBeijing 100191China Center for Integrated Computational Materials Engineering(International Research Institute for Multidisciplinary Science)and Key Laboratory of High-Temperature Structural Materials&Coatings Technology(Ministry of Industry and Information Technology) Beihang UniversityBeijing 100191China State Key Lab of Metal Matrix Composites School of Materials Science and EngineeringShanghai Jiao Tong UniversityShanghai 200240China

Thermodynamically stable and ultra-thin"phase"at the interface,known as complexions,can significantly improve the mechanical properties of nanolayered ***,the effect of complexions features(e.g.,crystalline orientation,crystalline structure and amorphous composition)on the plastic deformation remains inadequately investigated,and the corre-lation with the plastic transmission and mechanical response has not been fully ***,using atomistic simulations,we elucidate the different complexions-dominated plastic transmission and mechanical *** can alter the preferred slip system of dislocation nucleation,depending on the Schmid factor and interface *** nucleation,the dislocation density exhibits an inverse correlation with the stress magnitude,because the number of dislocations influences the initiation of plastic deformation and determines the stress *** crystalline complexions with different structures and orientations,the ability of dislocation transmission is mainly dependent on the continuity of the slip *** plastic transmission can easily proceed and exhibits relatively low flow stress when the slip system is *** the case of amorphous complexions with different compositions,compositional variations impact the atomic percentage of shear trans-formation zones after loading,resulting in different magnitudes of plastic *** smaller plastic deformation is produced,less stress can be released contributing to higher flow *** findings reveal the role of the complexions on plasticity behavior and provide valuable insights for the design of nanolayered composites.

关键词： Atomistic simulations Nanolayered composites Complexions Plasticity Mechanical response

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Enhancing Mg-Li alloy hydrogen storage kinetics by adding molecular sieve via friction stir processing

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Journal of materials science & Technology 2024年第13期180卷 45-54页

作者： Bin Li Xuan Sun Hao Chen Yan Yang Qun Luo Xiaohua Yang Yu'an Chen Guobing Wei Qian Li Fusheng Pan National Engineering Research Center for Magnesium Alloys&College of Materials Science and Engineering Chongqing UniversityChongqing 400044China State Key Laboratory of Advanced Special Steel&School of Materials Science and Engineering&Shanghai Key Laboratory of Advanced Ferrometallurgy Shanghai UniversityShanghai 200444China School of Mechanical Engineering Sichuan UniversityChengdu 610065China

Mg-Li alloy is a lightweight hydrogen storage material with high hydrogen capacity,but its poor kinetics limited its practical *** this work,MCM-22 molecular sieve was added to Mg-Li alloy by friction stir processing(FSP)as the catalyst to enhance the kinetic properties of Mg-Li alloy(denoted as Mg-Li-MCM-22).The resulting Mg-Li-MCM-22 possesses the reversible hydrogen storage capacity of ca.6 wt.%and can release 5.62 wt.%hydrogen within 50 min at 623 K,showing improved *** Chou model and Johnson-Mehl-Avrami-Kolmogorov(JMAK)model calculations reveal that the lattice defects generated by FSP improve the kinetics of hydrogen adsorption/*** pinning effect of MCM-22 particles produces more grain boundaries and dislocations,thus,increasing the diffusion rate of hydrogen atoms and providing more nucleation sites,therefore,reducing the dehydrogenation activation *** work provides a new strategy for the preparation of hydrogen storage materials.

关键词： Mg-Li alloy Hydrogen storage Hydriding/dehydriding reaction kinetics Friction stir processing Molecular sieve

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Nitride-reinforced HfNbTaTiV high-entropy alloy with excellent room and elevated-temperature mechanical properties

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Journal of materials science & Technology 2023年第18期149卷 31-41页

作者： Bingjie Wang Qianqian Wang Bo Sun Jinyong Mo Yangbin Guo Xiubing Liang Baolong Shen School of Materials Science and Engineering Jiangsu Key Laboratory for Advanced Metallic MaterialsSoutheast UniversityNanjing 211189China School of Materials Science and Engineering Jiangsu Key Laboratory of Advanced Structural Materials and Application TechnologyNanjing Institute of TechnologyNanjing 211167China Defense Innovation Institute Academy of Military ScienceBeijing 100071China

Nitride-reinforced(HfNbTaTiV)_(90)N_(10) high-entropy alloy aiming at high-temperature applications is de-signed in this *** FCC nitride phases are formed in situ in theBCC matrix by arc melt-ing technique,without complex deformation or heat ***(HfNbTaTiV)_(90)N_(10) alloy exhibits a remarkable yield strength of 2716 MPa and ultimate compressive strength of 2833 MPa with a plas-tic strain of 10%at room ***,the alloy remains a high yield strength of 279 MPa at 1400℃.The nitride phases play an essential role in maintaining the excellent strength-ductility com-bination at room temperature and enhancing the high-temperature softening *** BCC and FCC phases possess the semi-coherent interface,which not only strengthens the BCC matrix but also promotes the compatible deformation of the duplex *** lattice coherency structure of the semi-coherent interface is conducive to the slip transfer of partial dislocations through the interface,which facilitates the accommodation of plastic *** cross-slip of the screw dislocations ef-fectively eliminates stress concentration and leads to good ductility of the dual-phase *** results demonstrate that the nitride phases achieve coordinate deformation with the matrix without deteriorat-ing the ductility of the(HfNbTaTiV)_(90)N_(10) alloy.

关键词： Nitride-reinforced High-entropy alloy Softening resistance Strength-ductility balance Semi-coherent interface

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Synergistic enhancement of alkaline hydrogen evolution reaction by role of Ni-Fe LDH introducing frustrated Lewis pairs via vacancy-engineered

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Chinese Chemical Letters 2025年第3期36卷 512-516页

作者： Mianfeng Li Haozhi Wang Zijun Yang Zexiang Yin Yuan Liu Yingmei Bian Yang Wang Xuerong Zheng Yida Deng State Key Laboratory of Marine Resource Utilization in South China Sea School of Materials Science and EngineeringHainan UniversityHaikou 570228China Tianjin Key Laboratory of Composite and Functional Materials Key Laboratory of Advanced Ceramics and Machining Technology(Ministry of Education)School of Materials Science and EngineeringTianjin UniversityTianjin 300072China

The alkaline hydrogen evolution reaction(HER)is a crucial process for sustainable hydrogen production,yet it requires efficient and stable electrocatalysts to overcome the high activation energy *** article discusses a novel strategy for enhancing the performance of Ni-Fe layered double hydroxide(Ni-Fe LDH)in the alkaline HER by modifying it with a frustrated Lewis acid-base pair(FLP)constructed through vacancy *** study found that the modified Ni-Fe LDH exhibited improved alkaline HER *** functional theory(DFT)calculations demonstrate that the introduction of FLP can activate water and protons more efficiently than monometallic sites,thus reducing the alkaline HER energy barrier and *** HER under alkaline conditions,the Volmer step involves an additional hydrolysis dissociation compared to acidic conditions,which is one of the factors contributing to the slow reaction *** paper demonstrates that FLPs can alter the rate-determining step in alkaline HER from the Volmer step to a step with a lower energy barrier,more suitable for hydrogen *** work provides new insights into the role of FLPs in regulating the mechanism and kinetics of HER and opens a new direction for the design and optimization of LDH-based and other electrocatalysts.

关键词： Ni-Fe LDH Frustrated Lewis acid-base pair Density functional theory The ab initio molecular dynamics The alkaline hydrogen evolution reaction

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Near-infrared non-fused electron acceptors for efficient organic photovoltaics

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Chinese Chemical Letters 2024年第4期35卷 436-441页

作者： Wenxiang Ma Xinyu He Tianyi Chen De-Li Ma Hongzheng Chen Chang-Zhi Li State Key Laboratory of Silicon and Advanced Semiconductor Materials Department of Polymer Science and EngineeringZhejiang UniversityHangzhou 310027China

Developing narrow-bandgap organic semiconductors is important to facilitate the advancement of organic photovoltaics(OPVs). Herein, two near-infrared non-fused ring acceptors(NIR NFRAs), PTBFTT-F and PTBFTT-Cl have been developed with A-π_A-π_D-D-π_D-π_A-A non-fused structures. It is revealed that the introduction of electron deficient π-bridge(π_A) and multiple intramolecular noncovalent interactions effectively retained the structural planarity and intramolecular charge transfer of NFRAs, extending strong NIR photon absorption up to 950 nm. Further, the chlorinated acceptor, with the enlarged π-surface compared to the fluorinated counterpart, promoted not only molecular stacking in solid, but also the desirable photochemical stability in ambient, which are helpful to thereby improve the exciton and charge dynamics for the corresponding OPVs. Overall, this work provides valuable insights into the design of NIR organic semiconductors.

关键词： Organic photovoltaic Near-infrared Non-fused electron acceptor Noncovalent interaction Stability

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Oxidation resistant low-alloyed Ti alloys with good ductility

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Rare Metals 2024年第8期43卷 3921-3936页

作者： Meng Li Zhang-Zhi Shi Jun-Yi Xu Fu-Zhi Dai Xiang-Min Li Zi-Lin Li Lu-Ning Wang Beijing Advanced Innovation Center for Materials Genome Engineering State Key Laboratory for Advance Metals and MaterialsSchool of Materials Science and EngineeringUniversity of Science and Technology BeijingBeijingBeijing 100083China Institute of Materials Intelligent Technology Liaoning Academy of MaterialsShenyang 110004China

Oxidation resistance enhancement of pure Ti often comes at the cost of reduced ductility,which is frequently the problem through alloying with sole Al,Si,W,Mo and *** overcome the short coming of single element alloying,this paper proposes a multi-element low-alloying strategy to take advantage of synergistic effects and resolve the conflict between oxidation resistance and *** demonstrates that the addition of a small quantity of Ta(0.51wt%)can boost both oxidation resistance and ductility in comparison to pure ***,the combined addition of a small amount(0.54 wt%)of Ta,Nb and Si not only preserves good ductility of pure Ti,but also reduces mass gains to 14%-67%of pure Ti during 100 h oxidation at 650-850℃in *** indicates even better oxidation resistance than that obtained through the use of Ta,Nb,or Nb+Ta *** Ta+Nb+Si alloying creates an oxide layer that is less porous and more resistant to stratification and ***,a 3-μm N-rich layer can form in the Ti substrate beneath the oxide scale,in which phase transformation generates coherent Ti_(2)N with(0001)_(Ti)as the habit plane,with N atoms prefers to diffuse along■than along[0001]_(Ti).The completely transformed Ti_(2)N region or partially transformed Ti+Ti_(2)N region can effectively impede oxygen ***,the multielement low-alloying strategy is promising for enhancing both oxidation resistance and mechanical properties of metallic materials in the future.

关键词： Ti alloys Multi-element Co-alloying Oxidation resistance Mechanical properties

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One-step and Continuous Fabrication of Coaxial Piezoelectric Fiber for Sensing Application

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Chinese Journal of Polymer science 2023年第11期41卷 1778-1785,I0009页

作者： Shuai-Shuai Gui Bing-Xu Da Fei Peng Guo-Qiang Zheng Kun Dai Chun-Tai Liu Chang-Yu Shen College of Materials Science and Engineering Key Laboratory of Material Processing and Mold(Ministry of Education)Henan Key Laboratory of Advanced Nylon Materials and ApplicationZhengzhou UniversityZhengzhou 450001China

Although there has been rapid advancement in piezoelectric sensors,challenges still remain in developing wearable piezoelectric sensors by a one-step,continuous and environmentally friendly *** this work,a 1D flexible coaxial piezoelectric fiber was directly fabricated by melt extrusion molding,whose core and sheath layer are respectively slender steel wire(i.e.,electrode)and PVDF(i.e.,piezoelectric layer).Moreover,such 1D flexible coaxial piezoelectric fiber possesses short response time and high sensitivity,which can be used as a selfpowered sensor for bending and vibration *** interestingly,such 1D flexible coaxial piezoelectric fiber(1D-PFs)can be further endowed with 3D helical ***,a wearable and washable motion monitoring system can be constructed via braiding such 3D helical piezoelectric fiber(3D-PF)into commercial *** work paves a new way for developing 1D and 3D piezoelectric fibers through a one-step,continuous and environmentally friendly method,showing potential applications in the field of sensing and wearable electronics.

关键词： Coaxial piezoelectric fiber Melt extrusion molding Bending and vibration sensing Motion monitoring system

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Structure designing,interface engineering,and application prospects for sodium-ion inorganic solid electrolytes

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InfoMat 2024年第9期6卷 1-49页

作者： Meng Wu Hong Liu Xiang Qi Dabing Li Chao Wang Ce-Wen Nan Li-Zhen Fan Beijing Advanced Innovation Center for Materials Genome Engineering Beijing Key Laboratory for Advanced Energy Materials and TechnologiesUniversity of Science and Technology BeijingBeijingPeople's Republic of China State Key Laboratory of New Ceramics and Fine Processing School of Materials Science and EngineeringTsinghua UniversityBeijingPeople's Republic of China

All-solid Na-ion batteries(ASNIBs)present significant potential for integration into large-scale energy storage systems,capitalizing on their abundant raw materials,exemplary safety,and high energy *** the pivotal components propelling the advancement of ASNIBs,inorganic solid electrolytes(ISEs)have garnered substantial attention in recent years due to their high ionic conductivity(σ),wide electrochemical stability window(ESW),and high shear ***,this review systematically encapsulates the latest strides in Na-ion ISEs,furnishing a comprehensive panorama of various ISE systems along with their interface engineering strategies against the *** prime focus resides in accentuating key strategies for refining ion conduction properties and interfacial compatibility of ISEs through structure design and interface ***,the review explores the foremost challenges and prospects inherent to sodium-ion ISEs,striving to deepen our understanding of how to engineer more robust and efficient ISEs and interface stability,poised for the forthcoming era of advanced ASNIBs.

关键词： all-solid Na-ion batteries inorganic solid electrolytes interface stability ionic conductivity modification strategies

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