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Synthesis of Ag and Cd nanoparticles by nanosecond-pulsed discharge in liquid nitrogen

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Frontiers of Chemical Science and Engineering 2019年第2期13卷 360-368页

作者： Mahmoud Trad Alexandre Nominé Natalie Tarasenka Jaafar Ghanbaja Cédric Noel Malek Tabbal Thierry Belmonte Universite de Lorraine CNRSIJLF-54000 NancyFrance B.I. Stepanov Institute of Physics National Academy of Sciences of BelarusMinskBelarus Department of Physics American University of BeirutBeirutLebanon

The synthesis of CdO, Ag2O (5nm) and Ag (~20~30 nm) nano-objects is achieved simultaneously by nanosecond-pulsed discharges in liquid nitrogen between one cadmium electrode and one silver electrode. Oxidation occurs when liquid nitrogen is fully evaporated and nanoparticles are in contact with the air. No alloy is formed, whatever the conditions, even though both elements are present simultaneously, as showed by timeresolved optical emission spectroscopy. This lack of reactivity between elements is attributed to the high pressure within the discharge that keeps each metallic vapor around the electrode it comes from. Each element exhibits a specific behavior. Cubic Cd particles, formed at 4 kV, get elongated with filamentary tips when the applied voltage reaches 7 and 10 kV. Cd wires are formed by assembly in liquid nitrogen of Cd nanoparticles driven by dipole assembly, and not by dielectrophoresis. On the contrary, silver spherical particles get assembled into 2D dendritic structures. The anisotropic growth of these structures is assumed to be due to the existence of pressure gradients.

关键词： spark discharges submerged discharges timeresolved optical emission spectroscopy liquid nitrogen

Ultrafast antiferromagnet rearrangement in Co/IrMn/CoGd trilayers

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Chinese Physics B 2023年第8期32卷 109-114页

作者：郭宗夏 Gregory Malinowski Pierre Vallobra 彭懿许涌 Stéphane Mangin 赵巍胜 Michel Hehn 张博宇 Fert Beijing Institute School of Integrated Science and EngineeringBeihang UniversityBeijing 100191China Universitéde Lorraine CNRSIJLNancy54011 France Hefei Innovation Research Institute Beihang UniversityHefei 230012China

Antiferromagnets offer great potential for high-speed data processing applications,as they can expend spintronic devices from a static storage and gigahertz frequency range to the terahertz ***,their zero net magnetization makes them difficult to manipulate and *** recent years,there has been a lot of attention given to the ultrafast manipulation of magnetic order using ultra-short single laser pulses,but it remains unknown whether a similar scenario can be observed in *** this work,we demonstrate the manipulation of antiferromagnets with a single femtosecond laser pulse in perpendicular exchange-biased Co/Ir Mn/Co Gd *** study the dual exchange bias interlayer interaction in quasi-static conditions and competition in ultrafast antiferromagnet *** results show that,compared to conventional ferromagnetic/antiferromagnetic systems,the Ir Mn antiferromagnet can be ultrafast and efficiently manipulated by the coupled Co Gd ferrimagnetic layer,which paves the way for potential energy-efficient spintronic devices.

关键词： antiferromagnet ferrimagnet exchange bias all-optical switching

High-Density Nanowells Formation in Ultrafast Laser-Irradiated Thin Film Metallic Glass

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Nano-Micro Letters 2022年第6期14卷 308-322页

作者： Mathilde Prudent Djafar Iabbaden Florent Bourquard Stéphanie Reynaud Yaya Lefkir Alejandro Borroto Jean-François Pierson Florence Garrelie Jean-Philippe Colombier Univ Lyon UJM-Saint-EtienneCNRSInstitute of Optics Graduate SchoolLaboratoire Hubert CurienUMR CNRS 551642023 St-EtienneFrance Universitéde Lorraine CNRSIJL54000 NancyFrance

We present an effective approach for fabricating nanowell arrays in a one-step laser process with promising applications for the storage and detection of chemical or biological *** thin films of metallic glasses are manufactured with a selected composition of Zr_(65)Cu_(35),known to exhibit remarkable mechanical properties and glass forming *** nanowell arrays spontaneously form in the ultrafast laser irradiation spot with dimensions down to 20 *** flared shape observed by transmission electron microscopy is ideal to ensure chemical or biological material immobilization into the *** also indicates that the localization of the cavitation-induced nanopores can be tuned by the density and size of the initial nanometric interstice from the columnar structure of films deposited by magnetron *** addition to the topographic functionalization,the laser-irradiated amorphous material exhibits structural changes analyzed by spectroscopic techniques at the nanoscale such as energy-dispersive X-ray spectroscopy and electron energy loss *** reveal structural changes consisting of nanocrystals of monoclinic zirconia that grow within the amorphous *** mechanism is driven by local oxidation process catalyzed by extreme temperature and pressure conditions estimated by an atomistic simulation of the laser-induced nanowell formation.

关键词： Nanowell Nanoripple Metallic glass Surface functionalization Femtosecond laser

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百年荣耀，风华再现--台湾博物馆照明设计

照明设计 2014年第5期 86-89页

作者： I Jane Lo ijl照明

每一个城市都有属于自己的公园绿地，二二八纪念公园位于台北市西区，如同纽约的中央公园，已成立于1908年的台湾博物馆即位于其中，绿意林映，是台湾历史最悠久的博物馆，主要馆藏为台湾人文史料与自然产物，整体建筑平面配置呈南北一... 详细信息

每一个城市都有属于自己的公园绿地，二二八纪念公园位于台北市西区，如同纽约的中央公园，已成立于1908年的台湾博物馆即位于其中，绿意林映，是台湾历史最悠久的博物馆，主要馆藏为台湾人文史料与自然产物，整体建筑平面配置呈南北一字形自勺座向，可以减少西晒的面积。

关键词：博物馆台湾地区照明设计公园绿地中央公园平面配置台北市建筑

Phase transformation kinetics in metastable titanium alloys

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Chinese Science Bulletin 2014年第10期59卷 1773-1777页

作者： Hui Chang Elisabeth A. Gautier Lian Zhou School of Materials Science and Engineering Nanjing University of Technology ijl SI2M UMR CNRS 7198 Ecole des Mines Parc de Saurupt 54042 Nancy Cedex France

We investigated the phase transformation sequence,kinetics,and microstructural evolutions during heating,isothermal treatment,and continuous cooling of the metastable Ti–B19 *** the basis of these results,we summarized the phase transformation characteristics of this kind of alloys,especially the metastable b-Ti *** also analyzed and discussed the possibility of describing the size,morphology,and distribution of precipitates as well as the possibility of and complications in establishing relationships among the chemical composition,microstructure,processing parameters,and properties of the metastable Ti–B19 alloy.

关键词：相变动力学钛合金等温处理冷却过程微观结构相变特性 Ti合金化学成分

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Enhanced dielectric and electrocaloric properties in lead-free rod-like BCZT ceramics

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Journal of Advanced Ceramics 2020年第2期9卷 210-219页

作者： Zouhair HANANI Soukaina MERSELMIZ Abdelaadim DANINE Nicolas STEIN Daoud MEZZANE M’barek AMJOUD Mohammed LAHCINI Yaovi GAGOU Matjaz SPREITZER Damjan VENGUST Zdravko KUTNJAK Mimoun El MARSSI Igor ALUK'YANCHUK Mohamed GOUNE IMED-Lab Cadi Ayyad UniversityMarrakesh 40000Morocco ICMCB University of 1.BordeauxPessac 33600France ijl University of LorraineNancy 54000France UM6P Ben Guerir 43150Morocco LPMC University of Picardy Jules VerneAmiens 80039France Jozef Stefan Institute Ljubljana 1000Slovenia Physics Faculty Southern Federal UniversityRostov-on-Don 344090Russia

Ba0.85Ca0.15Zr0.10Ti0.90O3(BCZT)lead-free ceramics demonstrated excellent dielectric,ferroelectric,and piezoelectric properties at the morphotropic phase boundary(MPB).So far,to study the effect of morphological changes on dielectric and ferroelectric properties in lead-free BCZT ceramics,researchers have mostly focused on the influence of spherical grain shape *** this study,BCZT ceramics with rod-like grains and aspect ratio of about 10 were synthesized by surfactant-assisted solvothermal route.X-ray diffraction(XRD)and selected area electron diffraction(SAED)performed at room temperature confirm the crystallization of pure perovskite with tetragonal *** electron microscopy(SEM)image showed that BCZT ceramics have kept the 1D rod-like grains with an average aspect ratio of about ***-like BCZT ceramics exhibit enhanced dielectric ferroelectric(εr=11,906,tanδ=0.014,Pr=6.01μC/cm^2,and Ec=2.46 kV/cm),and electrocaloric properties(ΔT=0.492 K andz=0.289(K×mm)/kV at 17 kV/cm)with respect to spherical BCZT ***,rod-like BCZT lead-free ceramics have good potential to be used in solid-state refrigeration technology.

关键词： lead-free Ba0.85Ca0.15Zr0.10Ti0.90O3(BCZT) rod-like Ba0.85Ca0.15Zr0.10Ti0.90O3(BCZT) dielectric ferroelectric electrocaloric effect

Use of Additive Based on Non-Timber Forest Products for the Ecological Stabilization of Raw Earth:Case of the Parkia Biglobosa Nut and Vitellaria Paradoxa

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Journal of Renewable Materials 2023年第12期11卷 4143-4160页

作者： Bio Chéïssou Koto Tamou Jean-Michel Mechling Crespin Prudence Yabi Gildas EdjrossèF.Godonou Edmond Codjo Adjovi Mohamed Gibigaye AndréLecomte Nicolas Brosse L2EGC-Laboratory of Studies and Tests in Civil Engineering University of SciencesTechnologyEngineeringand MathematicsAbomeyBenin ijl-Jean Lamour Institute University of LorraineNancyFrance LEMA-Laboratory of Energetics and Applied Mechanics University of Abomey-CalaviAbomey-CalaviBenin LERMAB-Study and Research Laboratory on Wood Material University of LorraineNancyFrance

The housing sector today uses elaborate materials such as cement,iron,sand,often prohibitively expensive and whose production generates a strong environmental impact(scarcity of resources,transport,greenhouse gas greenhouse,etc.).In order to meet the challenges of sustainable development,earth construction is experiencing a resurgence of interest these *** its many advantages,raw earth material has drawbacks,in particular its low mechanical resistance and its loss of geometric characteristics in the face of water,which slow down its *** part of this study,the mechanical characteristics and durability of raw earth were improved by using residual water from the processing of Parkia Biglobosa(nere)and Vitellaria Paradoxa(shea)nuts in order to optimize its use for the construction of modern *** this end,the decoctions resulting from the artisanal transformation of the nut of the Parkia Biglobosa into African mustard and of the Vitellaria Paradoxa into shea butter were added to the raw earth according to volume proportions of 25%,50%,75%and 100%of the aqueous solution to obtain the projected ***,mechanical characterization and durability tests were carried out on the composites *** results revealed that the decoctions of Vitellaria Paradoxa and Parkia Biglobosa improve the compressive strength of the material by up to 90%and 260%,***,these decoctions improved the resistance to water penetration of the 100%additive composite by 1.5 times for Vitellaria Paradoxa and 5 times for Parkia *** study shows that it is possible to use decoctions as raw earth stabilizers to build modern,ecological buildings at lower energy ***,more in-depth studies on surface wettability and long-term durability are planned to better characterize the geomaterial.

关键词： Raw earth organic additive adobe Vitellaria Paradoxa Parkia Biglobosa durability

Reconstruction of hollow areas in density profiles from frequency swept reflectometry

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Plasma Science and Technology 2020年第6期22卷 32-40页

作者： Rennan B MORALES Stéphane HEURAUX Roland SABOT Sébastien HACQUIN Frédéric CLAIRET the Tore Supra Team United Kingdom Atomic Energy Authority Culham Centre for Fusion EnergyCulham Science CentreAbingdonOxonOX143DBUnited Kingdom ijl UMR CNRSUniversity of LorraineBP50840NancyF-54011France Institute of Physics University of Sao PauloSao Paulo 05315-970Brazil IRFM CEACadaracheF-13108 Saint-Paul-lez-DuranceFrance EUROfusion Programme Management Unit Culham Science CentreCulham OX143DBUnited Kingdom

The standard density profile reconstruction techniques are based on the WKB approximation of the probing wave’s phase,making them unable to properly reconstruct blind areas in the cut-off frequency *** reconstruction suffers a significant immediate error that is not rapidly *** is demonstrated that even though no reflections occur inside the hollow region causing the blind area,the higher probing frequencies that propagate through it carry information that can be used to estimate its *** usually ignored full-wave effects were investigated with the use of full-wave simulations in 1 D,with special attention paid to the frequency band where they are dominant.A database of perturbation signals was simulated onfive-dimensions of parameters and an application of the database inversion was demonstrated for a magnetic island in a Tore Supra *** new adapted reconstruction scheme improved the description of the density profile inside the hollow region and also along 10 cm after it.

关键词： FM-CW reflectometry profile reconstruction reflectometry density profile hollow profile blind area

Novel lead-free BCZT-based ceramic with thermally-stable recovered energy density and increased energy storage efficiency

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Journal of Materiomics 2022年第4期8卷 873-881页

作者： Zouhair Hanani Soukaina Merselmiz M'barek Amjoud Daoud Mezzane Mohammed Lahcini Jaafar Ghanbaja Matjaz Spreitzer Damjan Vengust Mimoun El Marssi Igor A.Luk'yanchuk Zdravko Kutnjak Brigita Rozic Mohamed Goune IMED-Lab Cadi Ayyad UniversityAvenue Abdelkrim El KhattabiP.B.549Marrakesh40000Morocco ICMCB University of Bordeaux87 Avenue Du Dr Albert SchweitzerPessac33600France Jozef Stefan Institute Jamova Cesta 39Ljubljana1000Slovenia LPMC University of Picardy Jules Verne33 Rue Saint LeuAmiens80039France Mohammed VI Polytechnic University Lot 660-Hay Moulay RachidBen Guerir43150Morocco ijl University of Lorraine54000NancyFrance Department of Building Materials Kyiv National University of Construction and ArchitectureKyiv03680Ukraine

The eco-responsible lead-free piezoelectric ceramics have been intensively searched for more than adecade, however, the final goal to replace toxic ceramics like lead zirconate titanate (PZT) with lead-freecompounds, having comparable or even better performance has not yet been reached. In this road, thelead-free ceramics Ba_(0.85)Ca_(0.15)Zr_(0.1)Ti_(0.9)O_(3) (BCZT), possessing excellent dielectric, ferroelectric, andpiezoelectric properties are regarded as serious candidates for the PZT replacement. Besides, nano-structuring BCZT is of paramount importance to enhance these functionalities even more. Here, BCZTmultipodes are designed by template-growth hydrothermal synthesis using hydrogen zirconate titanatenanowires. We demonstrate that the fabricated BCZT multipodes exhibit high dielectric permittivity of5300 with a temperature stability coefficient of ±5.9% between 20 and 140℃. A significant recoveredenergy density of 315.0 mJ/cm^(3) with high thermal stability and high energy storage efficiency of 87.4%,and enhanced large-signal piezoelectric coefficient d^(*)_(33) (310 pm/V) are found. Compared to the tradi-tional BCZT ceramics reported in the literature, relying on high-temperature processing, our sampleexhibits boosted energy storage parameters at a much lower temperature. These outcomes may offer anew strategy to tailor eco-responsible relaxor ferroelectrics toward superior energy storage performancefor ceramic capacitor applications.

关键词： Lead-free ceramics Low temperature Piezoelectric Thermal stability Energy storage Nanostructuration