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Quantum dots assisted in vivo two-photon microscopy with NIR-Ⅱemission

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Photonics Research 2022年第1期10卷 189-196页

作者： HUWEI NI YALUN WANG TAO TANG WENBIN YU DONGYU LI MUBIN HE RUNZE CHEN MINGXI ZHANG JUN QIAN State Key Laboratory of Modern Optical Instrumentations Centre for Optical and Electromagnetic ResearchCollege of Optical Science and EngineeringInternational Research Center for Advanced PhotonicsZhejiang UniversityHangzhou 310058China SIEE(Sussex AI Institute) Zhejiang Gongshang UniversityHangzhou 310018China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070China Britton Chance Center for Biomedical Photonics Wuhan National Laboratory for OptoelectronicsHuazhong University of Science and TechnologyWuhan 430074China

With the advantages of high resolution and deep penetration depth,two-photon excited NIR-Ⅱ(900–1880 nm)fluorescence(2PF)microscopic bioimaging is ***,due to the lack of imaging systems and suitable probes,few such works,to our best knowledge,were demonstrated utilizing NIR-II excitation and NIR-Ⅱfluorescence ***,we used aqueously dispersible Pb S/Cd S quantum dots with bright NIR-II fluorescence as the contrast *** the excitation of a 1550 nm femtosecond(fs)laser,they emitted bright 2 PF in the NIR-Ⅱ***,a 2PF lifetime imaging microscopic(2PFLIM)system was implemented,and in vivo 2PFLIM images of mouse brain blood vessels were obtained for the first time to our best *** improve imaging speed,an in vivo two-photon fluorescence microscopy(2 PFM)system based on an In Ga As camera was implemented,and in vivo 2PFM images of QDs-stained mouse brain blood vessels were obtained.

关键词： excitation photon system

S‐Scheme 2D/2D Bi_(2)MoO_(6)/BiOI van der Waals heterojunction for CO_(2) photoreduction

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Chinese Journal of Catalysis 2022年第7期43卷 1657-1666页

作者： Zhongliao Wang Bei Cheng Liuyang Zhang Jiaguo Yu Youji Li S.Wageh Ahmed A.Al‐Ghamdi State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of TechnologyWuhan 430070HubeiChina Laboratory of Solar Fuel Faculty of Materials Science and ChemistryChina University of GeosciencesWuhan 430074HubeiChina College of chemistry and chemical engineering Jishou UniversityJishou 416000HunanChina Department of Physics Faculty of ScienceKing Abdulaziz UniversityJeddah 21589Saudi Arabia

Reducing CO_(2) to hydrocarbon fuels by solar irradiation provides a feasible channel for mitigating excessive CO_(2) emissions and addressing resource ***,severe charge recombi‐nation and the high energy barrier for CO_(2) photoreduction on the surface of photocatalysts com‐promise the catalytic ***,a 2D/2D Bi_(2)MoO_(6)/BiOI composite was fabricated to achieve improved CO_(2) photoreduction *** transfer in the composite was facilitated by the van der Waals heterojunction with a large‐area *** function calculation demon‐strated that S‐scheme charge transfer is operative in the composite,and effective charge separation and strong redox capability were revealed by time‐resolved photoluminescence and electron para‐magnetic resonance ***,the intermediates of CO_(2) photoreduction were identi‐fied based on the in situ diffuse reflectance infrared Fourier‐transform *** functional theory calculations showed that CO_(2) hydrogenation is the rate‐determining step for yielding CH_(4) and *** Bi_(2)MoO_(6) into the composite further decreased the energy barrier for CO_(2) photoreduction on BiOI by 0.35 *** study verifies the synergistic effect of the S‐scheme heterojunction and van der Waals heterojunction in the 2D/2D composite.

关键词： 2D/2D S‐scheme heterojunction van der Waals heterojunction CO_(2)photoreduction

Molecular Dynamics Simulation and Test Characterization of Metal Migration Behavior in Antimony-Impregnated Graphite

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SSRN 2024年

作者： Lu, Junjie Ma, Yurun Shi, Junqin Li, He Zhang, Wei NingboTech University Ningbo Key Laboratory of Advanced Seal Ningbo China State Key Laboratory of Solidification Processing Center of Advanced Lubrication and Seal Materials Northwestern Polytechnic University Shaanxi Xi'An710072 China Key Laboratory of Marine Materials and Related Technologies Zhejiang Key Laboratory of Marine Materials and Protective Technologies Ningbo Institute of Materials Technology and Engineering Chinese Academy of Sciences Ningbo China Northwest Institute for Non-ferrous Metal Research

The research commenced with the synthesis of antimony-impregnated graphite composites, designated as C/Sb20%. The samples were characterized by friction test and surface test. Furthermore, the simulation of analytical dynamics is carried out. Notably, findings from the simulations reveal a dramatic decline in antimony concentration within the C/Sb20% samples. Concurrently, the emergence of Sb2O3 and Sb2O5 oxides was observed, indicating oxidative phenomena. Further elucidation from FIB-TEM analysis confirmed that the antimony lattice within the C/Sb20% consistently exhibited a face-centered cubic configuration. This study unveils the extraordinary activity and "softening" of antimony flake structures. This transformation, from flake to agglomerated forms, coupled with sliding friction, leads to the disruption of the graphite's internal structure, facilitating the continuous efflux of antimony. © 2024, The Authors. All rights reserved.

关键词： Molecular dynamics

Microstrip Antenna Arrays Based on Two-dimensional Titanium Carbide (MXene) Films

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Microstrip Antenna Arrays Based on Two-dimensional Titanium ...

International Conference on Microwave and Millimeter Wave technology Proceedings

作者： Jiannan Guo Hao-Ran Zu Runjie Yang Xueyu Liu Bao-Wen Li Rongguo Song Daping He Hubei Engineering Research Center of RF-Microwave Technology and Application Wuhan China State Key Laboratory of Advanced Technology for Materials Synthesisand Processing Center of Smart Materials and Devices Wuhan China

In this work, a microstrip antenna array based on a two-dimensional titanium carbide (MXene) film with an operating frequency of 3.5 GHz is proposed for the first time. MXene film has a conductivity of 5*10 5 S/m and a thickness of 15 μm, which has good ductility and flexibility. The radiating units are arranged by 2 units, and the microstrip lines with parallel feeding between the array elements directly feed the antenna. The return loss of the proposed 2*2 MXene antenna array is -24.3 dB, and the impedance bandwidth of a -10 dB is 11.1% (3.21 GHz-3.66 GHz), and a maximum gain of 5.73 dBi. The results show that the MXene antenna array has excellent performance and verifies the feasibility of preparing high-performance antennas, which have significant potential for future 5G mobile communication. It has crucial application potential in future 5G mobile communication.

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Nonmetallic Trace Elements X (X = H, C, N, O, B and S) Induced Rhenium Co-Segregation in Nickel Σ5 (210) Symmetrical Tilt Grain Boundary

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SSRN 2023年

作者： Xue, Hongtao Dang, Ruidong Tang, Fuling Lu, Xuefeng Ren, Junqiang Li, Junchen State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China

The thermally/mechanically-driven structural instability of nano- and coarse-grained polycrystalline metals originates from the unstable grain boundaries (GBs). GB segregation of solute elements could not only stabilize but also embrittle GBs. To improve GB stability and cohesion in parallel via solute segregations, in this work the segregation behavior of six non-metallic impurities X at the Σ5 [001](210) GB of nickel-based alloys, their co-segregations with Re element that has no GB segregation tendency, and segregation-induced changes in GB properties were investigated comprehensively from first-principles calculations. We discovered that these nonmetallic elements can segregate to the Ni GB and thus stabilize it, but they are GB embrittlers except B. Annealing temperature and bulk concentration have no effect on the S segregation. With the X pre-segregations, induced GB segregations of Re were observed, which lowers the excess energy and enhances the cohesive strength of all X-segregated GBs. The attractive interactions between C/N/B and Re atoms promote the Re segregation. The stabilizing and strengthening mechanisms of Re segregation were mainly attributed to the changes in Fermi level location and the increased interplanar bonding, respectively. Our findings may gain more insights into the atomic-scale GB co-segregations and stabilization of nano- and coarse-grained Ni-based alloys. © 2023, The Authors. All rights reserved.

关键词： Grain boundaries

Tea stain-inspired solar energy harvesting polyphenolic nanocoatings with tunable absorption spectra

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Nano Research 2021年第4期14卷 969-975页

作者： Lu Yang Yuan Zou Wei Xia Haotian Li Xinyu He Yi Zhou Xianhu Liu Chaoqun Zhang Yiwen Li College of Polymer Science and Engineering State Key Laboratory of Polymer Materials EngineeringSichuan UniversityChengdu 610065China National Engineering Research Center for Advanced Polymer Processing Technology Zhengzhou UniversityZhengzhou 450002China Key Laboratory for Biobased Materials and Energy of Ministry of Education College of Materials and EnergySouth China Agricultural University483 Wushan RoadGuangzhou 510642China Guangdong Laboratory for Lingnan Modem Agricultural Science and Technology 483 Wushan RoadGuangzhou 510642China

Discovery and development of new sustainable photothermal materials with tunable light absorption spectra play a key role in solar energy harvesting and *** possible solution to this quest is to check nature as a source of matters or *** by the formation of tea stains,a unique class of dark stain materials generated by the interfacial reaction between tea polyphenols and metal substance,we reported the facile preparation and screening of a series of photothermal nanocoating layers via the metal ion(i.e.C u(ll)>Fe(lll),Ni(ll),Zn(ll))promoted in situ polymerization of typical phenolic moieties of tea polyphenols(i.e.,catechol and pyrogallol).It was found that those resulting metal-polyphenolic nanocoatings showed various promising features,such as high blackness and strong adhesion,excellent and tunable light absorption properties,good hydrophilicity and long-term *** further fabricated the photothermal composite devices by/n s/'fty formation of meta卜polyphenolic nanocoatings on pristine silks for solar desalination,which demonstrated promising durable evaporation behaviors with excellent evaporation rates and steam generation *** believe that this work could provide more opportunities towards new types of bio-inspired and sustainable photothermal nanomaterials for solar energy harvesting applications such as water desalination.

关键词： metal-polyphenolic nanocoating polymerization light absorption photothermal solar desalination

Advances in the study of HOR reaction mechanisms under alkaline conditions

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Advanced Sensor and Energy Materials

advanced Sensor and Energy materials 2024年第1期3卷 23-38页

作者： Yuru Liao Shengchen Wang Yifan Zhang Yue Zhang Yun Gao Xueqin Mu Suli Liu Dingsheng Wang Zhihui Dai School of Chemistry and Molecular Engineering Nanjing Tech UniversityNanjing 211816China State Key Laboratory of Advanced Technology for Materials Synthesis and Processing Wuhan University of Technology InstitutionWuhan 430070China Engineering Research Center of Advanced Rare Earth Materials Department of ChemistryTsinghua UniversityBeijing100084China

Hydrogen energy is an important energy carrier,which is an ideal choice to meet energy demand and reduce harmful gas *** green recycling of hydrogen energy depends on water electrolysis and hydrogen fuel cells,which involves hydrogen oxidation reaction(HOR)and hydrogen evolution reaction(HER).The activity of HER/HOR in alkaline electrolyte,however,exhibits a significantly lower magnitude(2–3 orders)compared to that observed in an acidic medium,which hinders the development of alkaline water electrolysis and alkaline membrane fuel ***,comprehending the characteristics of HOR/HER activity in alkaline electrolytes and elucidating its underlyingmechanismis a prerequisite for the designof advanced *** on this background,this reviewwill briefly summarize the explanations and controversies about the basic HOR mechanism,including bifunctional mechanismand hydrogen binding energy ***,the crucial affecting factors of theHOR kinetics,such as dband center theory,interfacial water recombination,alkali metal cations and electronic effects,are ***,based on the above theories,the design principle,catalytic performance,and latest progress ofHOR electrocatalysts are *** outlook and future research perspectives of advanced catalysts for hydrogen energy recycling are *** reviewis helpful to understand the latest development ofHORmechanismand design cost-effective and high-performance HOR electrocatalysts towards the production of clean renewable energies.

关键词： Hydrogen oxidation reaction(HOR) Electrocatalytic mechanism Hydrogen binding energy theory(HBE) Bifunctional theory

First-Principles Study of Discharge Products and Their Stability of Lithium-Nitrogen Batteries

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SSRN 2023年

作者： Qu, Guo-Xiong Zhao, Xu-Dong Wei, Cheng-Dong Zhang, Hong-Yi Yang, Yu-Tong Xue, Hong-Tao Tang, Fu-Ling State Key Laboratory of Advanced Processing and Recycling of Non-ferrous Metals School of Materials Science and Engineering Lanzhou University of Technology Lanzhou730050 China

In this paper we adopted the first-principles approach to simulate and analyze the possible material changes in the discharge process of Li-N2 battery. The discharge process is simulated on a 4N-graphene anode substrate model, by analyzing its molecular configuration, electrostatic potential, density of states, HOMO, and LUMO. Experimental results confirmed that Li3N is the final stabilization product of Li-N2 battery. Furthermore, we found that the adsorption energy is proportional to the amount of charge transferred. The battery voltage-capacity is computed based on the change of Gibbs free energy curve. The electrical properties of the adsorption system indicate that the adsorption of Li-N2 transforms graphene from a semiconducting material to a metallic one. In addition, the differential charge also indicates that the Li-N substance has a strong adsorption interaction with the substrate, which can play the dual roles of electricity storage and nitrogen fixation. © 2023, The Authors. All rights reserved.

关键词： Electronic properties

Effect of Al(Oh)3 on the Properties of Silicon-Based Ceramic Cores Prepared by Laser Powder Bed Fusion Combined with Vacuum Infiltration

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SSRN 2024年

作者： Liu, Heng Zhang, Ren-Zhong Wu, Jia-Min Li, Wei-Kang Zhou, Shi-Xiang Zhang, Jie Zheng, Wen Yan, Chun-Ze Wen, Shi-Feng Ye, Chun-Sheng Shi, Yu-Sheng Chen, Chao-Yue Ren, Zhong-Ming State Key Laboratory of Materials Processing and Die & Mould Technology School of Materials Science and Engineering Huazhong University of Science and Technology Wuhan430074 China Engineering Research Center of Ceramic Materials for Additive Manufacturing Ministry of Education Wuhan430074 China Wenzhou Key Laboratory of Microwave Communication Materials and Devices Wenzhou Advanced Manufacturing Institute of HUST Wenzhou325035 China State Key Laboratory of Advanced Special Steels School of Materials Science and Engineering Shanghai University Shanghai200444 China

Silicon-based ceramic cores with low coefficients of thermal expansion, low sintering temperatures, and excellent acid and alkali leaching capabilities are indispensable materials in the production of hollow blades. However, the mechanical properties of these materials are not ideal, and there are many challenges in processing them. In this study, silicon-based ceramic cores were prepared using a combination of vacuum infiltration (VI) and laser powder bed fusion (LPBF) techniques. Al(OH)3 was employed as a mineralizer to enhance post-sintering mechanical properties and improve the efficiency of vacuum infiltration, thereby enhancing the overall performance of the silicon-based ceramic cores. The VI process enabled nano-SiO2 to penetrate the sample, increasing its density and promoting cristobalite formation during sintering at 1225°C. Furthermore, Al(OH)3 powder enhanced ambient temperature flexural strength by reducing microcracks, inhibiting excessive cristobalite transformation, and improving the VI process. By optimizing the Al(OH)3 content and refining the VI procedure, significant improvements in the microstructure and properties of silicon-based ceramic cores were achieved. Following three rounds of vacuum infiltration and the incorporation of 4 wt.% Al(OH)3, the samples demonstrated a high-temperature creep of 0.17 mm, with flexural strengths of 15.23 MPa at room temperature and 23.55 MPa at high temperature. © 2024, The Authors. All rights reserved.

关键词： Bending strength