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Photo-thermal synergistic excitation:Feasible strategy to detect ethanol for wide bandgap ZIF-8at low work temperature

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Journal of Environmental Sciences 2024年第4期138卷 112-120页

作者： Shuhao Shi Qian Du Ming Hou Xiaolei Ye Li Yang Shenghui Guo Jianhong Yi Ullah Ehsan Hongbo Zeng state Key Laboratory of Complex Nonferrous Metal Resources Clean Utilization Faculty of Metallurgical and Energy EngineeringKunming University of Science and TechnologyKunming 650093China Department of Chemical and Materials Engineering University of AlbertaEdmonton T6G 2V4Canada femto-st institute(umr CNRS 6174) Universite de Bourgogne Franche-Comte(UBFC)Universite de technologie de Belfort Montbéliard(UTBM)Site de MontbeliardBelfort F-90010France Faculty of Materials Science and Engineering Kunming University of Science and TechnologyKunming 650093China

Zeolitic Imidazolate Framework-8(ZIF-8)material was prepared by chemical precipitation method.The microstructure and physical properties of the as-prepared samples were characterized by XRD,BET,FESEM and UV spectrophotometer.The self-made four-channel measurement device was used to test the gas sensitivity of ZIF-8 material toward ethanol gas under photo-thermal synergistic excitation.The results showed that the sample was typical ZIF-8(E_(g)=4.96 eV)with a regular dodecahedron shape and the specific surface is up to 1793 m^(2)/g.The as-prepared ZIF-8 has a gas response value of 55.04 to 100 ppm ethanol at 75℃ and it shows good gas sensing selectivity and repeated stability.The excellent gas sensitivity can be attributed to the increase of free electron concentration in the ZIF-8 conduction band by photo-thermal synergistic excitation,and the large specific surface area of ZIF-8 material provides more active sites for gas-solid surface reaction.The reaction mechanism of ZIF-8 material under multi-field excitation was also discussed.

关键词： ZIF-8 material Photo-thermal synergistic excitation UV-light irradiation Photon-generated electron and hole Gas-sensitive property

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Controlling hydrogenation of C=C and C=O bonds in cinnamaldehyde using Pt1/Ni and Pt1/Co single-atom alloy catalysts

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Rare Metals 2024年第6期43卷 2859-2868页

作者： Huan-Shi Lan Yi-Da Yang Qing-Di Sun Hao Zhang Ying Zhang Qian He Ran Chen Guo-Yi Bai Xiao-Hui He Hong-Bing Ji School of Chemistry and Chemical Engineering Guangxi University Key Laboratory of Bioinorganicand Synthetic Chemistry of Ministry of Education Fine Chemical Industry Research InstituteSchool of ChemistryIGCMESun Yat-sen University UBFC CNRSENSMMFEMTO-ST Institute College of Chemistry and Materials Science Hebei University state Key Laboratory Breeding Base of Green-Chemical Synthesis Technology Institute of Green Petroleum Processing and Light Hydrocarbon ConversionCollege of Chemical EngineeringZhejiang University of Technology

Selective hydrogenation of C=C and C=O bonds in cinnamaldehyde (CAL) to produce desired products is a challenging task due to the complex conjugate system of the two unsaturated functional groups.In this study,a simple ball milling method is presented for synthesizing Pt-based single-atom alloy catalysts (SAAs) that can function as a control switch for the selective hydrogenation of CAL into highly valuable products.

关键词： SELECTIVE HYDROGENATION CHEMOSELECTIVE HYDROGENATION NANOPARTICLES GENERATION EFFICIENT FE CO

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Using strain energy-based prediction of effective elastic properties in topology optimization of material microstructures

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Acta Mechanica Sinica 2007年第1期23卷 77-89页

作者： Weihong Zhang Gaoming Dai Fengwen Wang Shiping Sun Hicham Bassir institute of Mechatronic Engineering Northwestern Polytechnical University Xi'an 710072 China femto-st Department of LMARC UMR--CNRS 6174 25000 Besancon France

An alternative strain energy method is proposed for the prediction of effective elastic properties of orthotropic materials in this paper. The method is implemented in the topology optimization procedure to design cellular solids. A comparative study is made between the strain energy method and the well-known homogenization method. Numerical results show that both methods agree well in the numerical prediction and sensitivity analysis of effective elastic tensor when homogeneous boundary conditions are properly specified. Two dimensional and three dimensional microstructures are optimized for maximum stiffness designs by combining the proposed method with the dual optimization algorithm of convex programming. Satisfactory results are obtained for a variety of design cases.

关键词： Cellular solids Material design Homogenization method strain energy Topology optimization

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Ballistic resistance and energy dissipation of woven-fabric composite targets:Insights on the effects of projectile shape and obliquity angle

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Defence Technology（防务技术） 2023年第3期21卷 14-32页

作者： Ibrahim Goda UniversitéBourgogne Franche-Comté FEMTO-ST InstituteDépartement Mécanique Appliquée24 Rue de L’Épitaphe25000BesançonFrance

This study aims at investigating the ballistic resistance and energy absorption in woven E-glass composite panels,considering different projectile nose shapes and oblique incidence angles.To that scope,three-dimensional finite element(FE)models of both projectiles and the laminated target are developed and numerical investigations are carried out using Abaqus Explicit solver.The composite damage model’s constitutive law encompasses nonlinear material response,material properties degradation,progressive failure,and an element deletion strategy.The cohesive surface technique is used to represent the interface between two adjacent plies in the laminate,and the traction-separation law is used to characterize the behaviors of interlaminar degradation and failure.Material responses attributable to fiber rupture,matrix cracking,and plasticity caused by micro-matrix cracking due to shear loading are taken into account with suitable damage evolution laws.The computational framework is first validated against the experimental results reported in the literature by performing ballistic impact tests on the target laminate with conical,hemispherical and blunt-ended projectile,and the numerical results showed a good comparison in terms of residual velocity.Subsequently the framework is explored in simulating more complex failure mechanisms,with particular emphasis on the influence of the impact angle of obliquity,a parameter that is not usually analyzed in the literature.In that regard,the effects of normal and oblique impact on the damage morphologies and ballistic behavior of the fabric composite target in terms of energy absorption,impact contact force,and projectile residual velocity are conducted and analyzed,comparatively.The findings showed that the ballistic impact behavior of target composite is substantially influenced by projectile nose shape and incidence angle obliquity.

关键词： resistance cracking composite

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Subwavelength polarization optics via individual and coupled helical traveling-wave nanoantennas

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Light(Science & Applications) 2019年第1期8卷 486-493页

作者： Mengjia Wang Roland Salut Huihui Lu Miguel-Angel Suarez Nicolas Martin Thierry Grosjean femto-st institute umr 6174 Univ.Bourgogne Franche-Comte CNRSBesanconFrance Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications Department of Optoelectronic EngineeringJinan UniversityGuangzhou 510632China

Light polarization control is a key factor in modern photonics.Recent advances in surface plasmon manipulation have introduced the prospect of more compact and more efficient devices for this purpose.However,the current plasmonic-based polarization optics remain much larger than the wavelength of light,which limits the design degrees of freedom.Here,we present a plasmonic traveling-wave nanoantenna using a gold-coated helical carbon nanowire end-fired with a dipolar aperture nanoantenna.Our nonresonant helical nanoantenna enables tunable polarization control by swirling surface plasmons on the subwavelength scale and taking advantage of the optical spin–orbit interaction.Four closely packed helical traveling-wave nanoantennas(HTNs)are demonstrated to locally convert an incoming light beam into four beams of tunable polarizations and intensities,with the ability to impart different polarization states to the output beams in a controllable way.Moreover,by near-field coupling four HTNs of opposite handedness,we demonstrate a subwavelength waveplate-like structure providing a degree of freedom in polarization control that is unachievable with ordinary polarization optics and current metamaterials.

关键词： polarization antenna optics

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Wafer-level vapor cells filled with laser-actuated hermetic seals for integrated atomic devices

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Microsystems & Nanoengineering 2022年第6期8卷 225-235页

作者： Vincent Maurice Clément Carlé Shervin Keshavarzi Ravinder Chutani Samuel Queste Ludovic Gauthier-Manuel Jean-Marc Cote Rémy Vicarini Moustafa Abdel Hafiz Rodolphe Boudot Nicolas Passilly IEMN-Institut d’Electronique de Microélectronique et de Nanotechnologie UMR8520 CNRSUniversitéLilleCentrale LilleF-59000 LilleFrance femto-st institute UMR6174 CNRSUniversitéBourgogne Franche-ComtéF-25030 BesançonFrance

Atomic devices such as atomic clocks and optically-pumped magnetometers rely on the interrogation of atoms contained in a cell whose inner content has to meet high standards of purity and accuracy.Glass-blowing techniques and craftsmanship have evolved over many decades to achieve such standards in macroscopic vapor cells.With the emergence of chip-scale atomic devices,the need for miniaturization and mass fabrication has led to the adoption of microfabrication techniques to make millimeter-scale vapor cells.However,many shortcomings remain and no process has been able to match the quality and versatility of glass-blown cells.Here,we introduce a novel approach to structure,fill and seal microfabricated vapor cells inspired from the century-old approach of glass-blowing,through opening and closing single-use zero-leak microfabricated valves.These valves are actuated exclusively by laser,and operate in the same way as the“make-seals”and“break-seals”found in the filling apparatus of traditional cells.Such structures are employed to fill cesium vapor cells at the wafer-level.The make-seal structure consists of a glass membrane that can be locally heated and deflected to seal a microchannel.The break-seal is obtained by breaching a silicon wall between cavities.This new approach allows adapting processes previously restricted to glass-blown cells.It can also be extended to vacuum microelectronics and vacuum-packaging of micro-electro-mechanical systems(MEMS)devices.

关键词： filled vacuum heated

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具有类roton色散关系的立方对称声学超材料

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Acta Mechanica Sinica 2023年第7期39卷 28-34页

作者：王珂陈毅 Muamer Kadic 王长国 Martin Wegener National Key Laboratory of Science and Technology on Advanced Composites in Special Environments Harbin Institute of TechnologyHarbin150001China institute of Applied Physics Karlsruhe Institute of Technology(KIT)Karlsruhe76128Germany institute of Nanotechnology Karlsruhe Institute of Technology(KIT)Karlsruhe76128Germany Institut femto-st UMR 6174CNRSUniversitéde Franche-ComtéBesançon25030France

我们之前的工作表明,声学超材料中的非局部相互作用会导致极不寻常的类roton色散关系,即色散曲线存在局部极小值,与超流体液氦-4类似.然而,这种行为仅限于一个或两个声传播方向.在这里,我们设计了一种三维立方对称声学超材料,沿三个正... 详细信息

我们之前的工作表明,声学超材料中的非局部相互作用会导致极不寻常的类roton色散关系,即色散曲线存在局部极小值,与超流体液氦-4类似.然而,这种行为仅限于一个或两个声传播方向.在这里,我们设计了一种三维立方对称声学超材料,沿三个正交方向具有非局部相互作用.有限元计算表明超材料在三个正交方向具有类roton行为,但其行为远非各向同性.有限元结果与半解析模型结果吻合良好.相应的实验正在探索中,由于需要密集而复杂的三维声学管道,实验要求较高.

关键词：色散关系色散曲线超材料半解析模型非各向同性超流体传播方向正交方向

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Two-photon polymerization of femtosecond high-order Bessel beams with aberration correction

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中国光学快报:英文版 2023年第7期21卷 22-27页

作者：贾而穑谢辰肖娜 Francois Courvoisier 胡明列 Ultrafast Laser Laboratory Key Laboratory of Opto-electronic Information Technical Science of Ministry of EducationSchool of Precision Instruments and Opto-electronics EngineeringTianjin UniversityTianjin 300072China femto-st institute Universitéde Bourgogne-Franche-ComtéUMR-617425030 BesançonFrance

In the femtosecond two-photon polymerization(2PP)experimental system,optical aberrations degrade the fabrication quality.To solve this issue,a multichannel interferometric wavefront sensing technique is adopted in the adaptive laser processing system with a single phase-only spatial light modulator.2PP fabrications using corrected high-order Bessel beams with the above solution have been conducted,and high-quality microstructure arrays of microtubes with 20μm diameter have been rapidly manufactured.The effectiveness of the proposed scheme is demonstrated by comparing the beam intensity distributions and 2PP results before and after aberration corrections.

关键词： femtosecond laser two-photon polymerization aberration correction Bessel beams

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High-consistency proton exchange membrane fuel cells enabled by oxygen-electron mixed-pathway electrodes via digitalization design

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Science Bulletin 2023年第3期68卷 266-275,M0003页

作者： Zhiming Bao Biao Xie Weizhuo Li Shenghui Zhong Linhao Fan Chasen Tongsh Fei Gao Qing Du Mohamed Benbouzid Kui Jiao state Key Laboratory of Engines Tianjin UniversityTianjin 300350China INSA Rennes Rennes 35700France Beihang Hangzhou Innovation institute Yuhang Hangzhou 310023China femto-st institute University of Technology of Belfort-MontbeliardNational Center for Scientific ResearchBelfort F-90010France umr 6027 IRDL Brest UniversityNational Center for Scientific ResearchBrest 29238France Shanghai Marine University Shanghai 201306China National Industry-Education Platform of Energy storage Tianjin UniversityTianjin 300350China

Proton exchange membrane(PEM)fuel cell has been regarded as a promising approach to the decarbonization and diversification of energy sources.In recent years,durability and cost issues of PEM fuel cells are increasingly significant with the rapid increase of power density.However,the failure to maintain the cell consistency,as one major cause of the above issue,has attracted little attention.Therefore,this study intends to figure out the underlying cause of cell inconsistency and provide solutions to it from the perspective of multi-physics transport coupled with electrochemical reactions.The PEM fuel cells with electrodes under two compression modes are firstly discussed to fully explain the relationship of cell performance and consistency to electrode structure and multi-physics transport.The result indicates that one main cause of cell inconsistency is the intrinsic conflict between the separated transport and cooperated consumption of oxygen and electron throughout the active area.Then,a mixed-pathway electrode design is proposed to reduce the cell inconsistency by enhancing the mixed transport of oxygen and electron in the electrode.It is found that the mixing of pathways in electrodes at under-rib region is more effective than that at the under-channel region,and can achieve an up to 40%reduction of the cell inconsistency with little(3.3%)sacrificed performance.In addition,all the investigations are implemented based on a self-developed digitalization platform that reconstructs the complex physical–chemical system of PEM fuel cells.The fully observable physical information of the digitalized cells provides strong support to the related analysis.

关键词： Proton exchange membrane fuel cell Digitalization Electrode Multi-physics transport Mixed pathways

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strong dependency of the tribological behavior of CuZr-based bulk metallic glasses on relative humidity in ambient air

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Friction 2023年第5期11卷 785-800页

作者： Solène BARLEMONT Paul LAFFONT Rémi DAUDIN Alexis LENAIN Guillaume COLAS Pierre-Henri CORNUAULT femto-st institute Department of Applied MechanicsUniversity of Bourgogne Franche-ComtéCNRS/UFC/ENSMM/UTBMBesançon 25030France University of Grenoble Alpes CNRSSIMaPGrenoble 38000France Vulkam Inc.Amorphous metal micro casting Gières 38610France

Thanks to their outstanding mechanical properties,Bulk Metallic Glasses(BMGs)are new alternatives to traditional crystalline metals for mechanical and micromechanical applications including power transmission.However,the tribological properties of BMGs are still poorly understood,mostly because their amorphous nature induces counter intuitive responses to friction and wear.In the present study,four different BMGs(Cu_(47)Zr_(46)Al_(7),Zr_(46)Cu_(45)Al_(7)Nb_(2),Zr_(60)Cu_(28)Al_(12),and Zr_(61)Cu_(25)Al_(12)Ti_(2))underwent ball-on-disc friction tests against 100Cr6 steel balls(American Iron and steel institute(AISI)52100)at different relative humidities(RHs)ranging from 20%to 80%.Controlling humidity enabled to observe a high repeatability of the friction and wear responses of the BMG.Interestingly,the friction coefficient decreased by a factor of 2 when the humidity was increased,and the wear rate of BMGs was particularly low thanks to a 3rd-body tribolayer that forms on the BMG surface,composed of oxidized wear particles originating from the ball.The morphology of this tribolayer is highly correlated to humidity.The study also identifies how the tribolayer is built up from the initial contact until the steady state is achieved.

关键词： Bulk Metallic Glasses(BMGs) tribology oxide transfer layer relative humidity(RH)

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