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Nanoscale resetting of the Th/Pb system in an isotopically-closed monazite grain: A combined atom probe and transmission electron microscopy study

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Geoscience Frontiers 2019年第1期10卷 65-76页

作者： A.-M.Seydoux-Guillaume D.Fougerouse A.T.Laurent E.Gardés S.M.Reddy D.W.Saxey Univ Lyon UJM-Saint-Etienne CNRS IRD cnrs Université Clermont Auvergne School of Earth and Planetary Sciences Curtin University Geoscience Atom Probe Advanced Resource Characterisation Facility John de Laeter Centre Curtin University Centre de recherche sur les Ions les Matériaux et la Photonique (CIMAP) department of Physics and Astronomy Curtin University

Understanding the mechanisms of parent-daughter isotopic mobility at the nanoscale is key to rigorous interpretation of Ue The Pb data and associated dating. Until now, all nanoscale geochronological studies on geological samples have relied on either Transmission Electron Microscope(TEM) or Atom Probe Microscopy(APM) characterizations alone, thus suffering from the respective weaknesses of each technique. Here we focus on monazite crystals from a ~1 Ga, ultrahigh temperature granulite from Rogaland(Norway). This sample has recorded concordant UeP b dates(measured by LA-ICP-MS) that range over 100 My, with the three domains yielding distinct isotopic Ue Pb ages of 1034 ± 6 Ma(D1; Srich core), 1005 ± 7 Ma(D2), and 935 ± 7 Ma(D3), respectively. Combined APM and TEM characterization of these monazite crystals reveal phase separation that led to the isolation of two different radiogenic Pb(Pb*) reservoirs at the nanoscale. The S-rich core of these monazite crystals contains Cae Srich clusters, 5 -10 nm in size, homogenously distributed within the monazite matrix with a mean interparticle distance of 40 -60 nm. The clusters acted as a sink for radiogenic Pb(Pb*) produced in the monazite matrix, which was reset at the nanoscale via Pb diffusion while the grain remained closed at the micro-scale. Compared to the concordant ages given by conventional micro-scale dating of the grain,the apparent nano-scale age of the monazite matrix in between clusters is about 100 Myr younger, which compares remarkably well to the duration of the metamorphic event. This study highlights the capabilities of combined APM-TEM nano-structural and nano-isotopic characterizations in dating and timing of geological events, allowing the detection of processes untraceable with conventional dating methods.

关键词： Monazite Nanoscale resetting Nano-clusters APM TEM UHT metamorphism

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design of Fe(3–x)O4 raspberry decorated graphene nanocomposites with high performances in lithium-ion battery

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Journal of Energy Chemistry 2016年第2期25卷 270-275页

作者： Olivier Gerber Sylvie Bégin-Colin Benoit P.Pichon Elodie Barraud Sébastien Lemonnier Cuong Pham-Huu Barbara Daffos Patrice Simon Jeremy Come Dominique Bégin Institut de Physique et Chimie des Materiaux de Strasbourg UMR 7504 - CNRS Universite de Strasbourg 23 rue du Loess 67034 Strasbourg Cedex 08France RS2E - FR cnrs n 3459 Universite Paul Sabatier Toulouse III CIRIMAT 118 route de Narbonne 31062 Toulouse Cedex 9 France French-German Research Institute of Saint-Louis 5 rue du General Cassagnou 68300 Saint-Louis France Institut de Chimie et Procedes pour l'Energie l'Environnement et la Sante UMR 7515-CNRS Universite de Strasbourg 25 rue Becquerel 67087 Strasbourg Cedex 02 France

Fe（3–x）O4 raspberry shaped nanostructures/graphene nanocomposites were synthesized by a one-step polyol-solvothermal method to be tested as electrode materials for Li-ion battery（LIB）. Indeed, Fe（3–x）O4 raspberry shaped nanostructures consist of original oriented aggregates of Fe（3–x）O4 magnetite nanocrystals, ensuring a low oxidation state of magnetite and a hollow and porous structure, which has been easily combined with graphene sheets. The resulting nanocomposite powder displays a very homogeneous spatial distribution of Fe（3–x）O4 nanostructures at the surface of the graphene sheets. These original nanostructures and their strong interaction with the graphene sheets resulted in very small capacity fading upon Li＋ion intercalation. Reversible capacity, as high as 660 m Ah/g, makes this material promising for anode in Li-ion batteries application.

关键词： Graphene Fe3–xO4 raspberry shaped nanostructures Fe3–xO4/graphene nanocomposites Lithium-ion battery Reversible capacity

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Characterization of Mediterranean Magnetotactic Bacteria

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Journal of Ocean University of China 2007年第4期6卷 355-359页

作者： Lefevre Christopher Bemadac Alain Pradel Nathalie WU Longfei Yu-Zhang Kui XIAO Tian Yonnet Jean-Paul Lebouc Afef SONG Tao Fukumori Yoshihiro laboratoire de Chimie Bactkrienne UPR 9043 CNRS Marseille France Service de Microscopic Electronique lnstitut de Biologic Structurale et Microbiologie CNRS Marseille France laboratoire de Microscopies et d＇etude de nanostructures （LMEN） Universite de Reims Champagne-Ardenne 51687 Reims cedex 2 France Key Laboratory of Marine Ecology and Environmental Sciences Institute of Oceanology Chinese Academy of Sciences Qingdao 266071 P. R. China laboratoire d＇Electrotechnique de Grenoble Institut National Polytechniques de Grenoble F-38402 Saint Martin d＇eres Cedex France Institute of Electrical Engineering Chinese Academy of Science Beijing 100080 P. R. China department of Life Science Graduate School of Nataral Science and Technology Kanazawa University Kanazawa Japan

Magnetotactic bacteria are a diverse group of motile prokaryotes that are ubiquitous in aquatic habitats and cosmopolitan in distribution. In this study, we collected magnetotactic bacteria from the Mediterranean Sea. A remarkable diversity of morphotypes was observed, including multicellular types that seemed to differ from those previously found in North and South America. Another interesting organism was one with magnetosomes arranged in a six-stranded bundle which occupied one third of the cell width. The magnetosome bundle was evident even under optic microscopy. These cells were connected together and swam as a linear entire unit. Magnetosomes did not always align up to form a straight linear chain. A chain composed of rectangle magnetosomes bent at a posi- tion with an oval crystal. High resolution transmission electron microscopy analysis of the crystal at the pivotal position suggested uncompleted formation of the crystal. This is the first report of Mediterranean magnetotactic bacteria, which should be useful for studies of biogeochemical cycling and geohistory of the Mediterranean Sea.

关键词：磁趋向性细菌生物地球化学地磁学地中海

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Synthesis of NaYF_(4):20% Yb^(3+),2% Er^(3+),2% Ce^(3+)@NaYF_(4) nanorods and their size dependent uptake efficiency under flow condition

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Journal of Rare Earths 2022年第10期40卷 1519-1526页

作者： Dongmei Qiu Jie Hu Peiyuan Wang decai Huang Yaling Lin Haina Tian Xiaodong Yi Qilin Zou Haomiao Zhu Fujian Normal University Fuzhou350007China CAS Key Laboratory of design and Assembly of Functional nanostructures and Fujian Key Laboratory of NanomaterialsFujian Institute of Research on the Structure of MatterChinese Academy of SciencesFuzhou 350002China Xiamen Key Laboratory of Rare Earth Photoelectric Functional Materials Xiamen Institute of Rare Earth MaterialsHaixi InstitutesChinese Academy of SciencesXiamen361021China College of Materials Science and Engineering Huaqiao UniversityXiamen 361021China Research Center of Biomedical Engineering of Xiamen&Key Laboratory of Biomedical Engineering of Fujian Province&Fujian Provincial Key Laboratory for Soft Functional Materials Research Department of BiomaterialsCollege of MaterialsXiamen UniversityXiamen 361005China Centre D’Elaboration de Mat eriaux et D’etudes Structurales(CEMES) CNRSUniversit e de Toulouse-UPS29 Rue Jeanne MarvigBP 9434731055ToulouseCedex 4France

Lanthanide doped fluorescent nanoparticles have gained considerable attention in biomedical ***,the low uptake efficiency of nanoparticles by cells has limited their *** this work,we demonstrate how the uptake efficiency is affected by the size of nanoparticles under flow *** the same size NaYF_(4):20%Yb^(3+),2%Er^(3+),2%Ce^(3+)(the contents of rare earths elements are in molar fraction)nanoparticles as core,NaYF_(4):20%Yb^(3+),2%Er^(3+),2%Ce^(3+)@NaYF_(4) core-shell structured nanorods(NRs)with different sizes of 60-224 nm were synthesized by thermal decomposition and hot injection *** excitation at 980 nm,a strong upconversion green emission(541 nm,^(2)H_(11/2)→^(4) I_(15/2) of Er^(3+))is observed for all *** emission intensity for each size nanorod was calibrated and is found to depend on the width of *** flow conditions,the nanorods with 96 nm show a maximum uptake efficiency by endothelial *** work demonstrates the importance of optimizing the size for improving the uptake efficiency of lanthanide-doped nanoparticles.

关键词： Uptake efficiency Endothelial cells Upconversion luminescence Cell imaging Rare earths

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Microfluidic actuators based on temperature-responsive hydrogels

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Microsystems & Nanoengineering 2018年第1期4卷 534-540页

作者： Loïc D'Eramo Benjamin Chollet Marie Leman Ekkachai Martwong Mengxing Li Hubert Geisler Jules Dupire Margaux Kerdraon Clémence Vergne Fabrice Monti Yvette Tran Patrick Tabeling MMN IPGGMicrofluidiqueMEMSNanostructures(MMN)Institut Pierre-Gilles de Gennes(IPGG)GulliverEcole Supérieure de Physique et Chimie Industrielles(ESPCI Paris)PSL Research University10 rue VauquelinParis 75005France SIMM ESPCI ParisSciences et Ingénierie de la Matière Molle(SIMM)Ecole Supérieure de Physique et Chimie Industrielles(ESPCI Paris)PSL Research University10 rue VauquelinParis 75005France Microfactory 8 rue Jean CalvinParis 75005France

The concept of using stimuli-responsive hydrogels to actuate fluids in microfluidic devices is particularly attractive,but limitations,in terms of spatial resolution,speed,reliability and integration,have hindered its development during the past two *** patterning and grafting poly(N-isopropylacrylamide)PNIPAM hydrogel films on plane substrates with a 2μm horizontal resolution and closing the system afterward,we have succeeded in unblocking bottlenecks that thermo-sensitive hydrogel technology has been challenged with until *** this paper,we demonstrate,for the first time with this technology,devices with up to 7800 actuated micro-cages that sequester and release solutes,along with valves actuated individually with closing and opening switching times of 0.6±0.1 and 0.25±0.15 s,*** applications of this technology are illustrated in the domain of single cell handling and the nuclear acid amplification test(NAAT)for the Human Synaptojanin 1 gene,which is suspected to be involved in several neurodegenerative diseases such as Parkinson’s *** performance of the temperature-responsive hydrogels we demonstrate here suggests that in association with their moderate costs,hydrogels may represent an alternative to the actuation or handling techniques currently used in microfluidics,that are,pressure actuated polydimethylsiloxane(PDMS)valves and droplets.

关键词： actuator high throughput hydrogel microfluidics single cell valve

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Investigation of KTiOPO4 Nanocrystals for Nonlinear Probing of Electric Optical Fields

Investigation of KTiOPO4 Nanocrystals for Nonlinear Probing ...

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第十三届全国量子光学学术报告会

作者： XUAN LOC LE SLABLAB ABDALLAH CHAUVAT DOMINIQUE ROCHJEAN-FRANOIS laboratoire de photonique Quantique et Molculaire ENS CachanUMR CNRS853761 avenue du Prsident Wilson94235 Cachan Cedex France laboratoire de photonique Quantique et Molculaire ENS CachanUMR CNRS853761 avenue du Prsident Wilson94235 Cachan Cedex France laboratoire de photonique Quantique et Molculaire ENS CachanUMR CNRS853761 avenue du Prsident Wilson94235 Cachan Cedex France laboratoire de photonique Quantique et Molculaire ENS CachanUMR CNRS853761 avenue du Prsident Wilson94235 Cachan Cedex France

＜正＞The finding of nonlinear nanometric-sized probes is of key importance for the development of nonlinear microscopy in physical as well as biological *** isolate nonlinear KTiOPO4（KTP） nanocrystals

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Structured laser beams: toward 2-μm femtosecond laser vortices

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Photonics Research 2021年第3期9卷 357-363页

作者： Yongguang Zhao Li Wang Weidong Chen Pavel Loiko Xavier Mateos Xiaodong Xu Ying Liu deyuan Shen Zhengping Wang Xinguang Xu Uwe Griebner Valentin Petrov Jiangsu Key Laboratory of Advanced Laser Materials and devices School of Physics and Electronic EngineeringJiangsu Normal UniversityXuzhou 221116China Max Born Institute for Nonlinear Optics and Short Pulse SpectroscofDy 12489 BerlinGermany Centre de Recherche sur les Ions les Materiaux et la Photonique(CIMAP)UMR 6252 CEA-CNRS-ENSICAENUniversite de CaenCaen 14050France Universitat Rovira i Virgin(URV) Fisica i Cristal lografia de Materials i Nanomaterials(FiCMA-FiCNA)Marcel.li Domingo 143007 TarragonaSpain State Key Laboratory of Crystal Materials and Institute of Crystal Materials Shandong UniversityJinan 250100China

Structured ultrashort-pulse laser beams, and in particular eigenmodes of the paraxial Helmholtz equation, are currently extensively studied for novel potential applications in various fields, e.g., laser plasma acceleration,attosecond science, and fine micromachining. To extend these prospects further, in the present work we push forward the advancement of such femtosecond structured laser sources into the 2-μm spectral region. Ultrashortpulse Hermite– and Laguerre–Gaussian laser modes both with a pulse duration around 100 fs are successfully produced from a compact solid-state laser in combination with a simple single-cylindrical-lens converter. The negligible beam astigmatism, the broad optical spectra, and the almost chirp-free pulses emphasize the high reliability of this laser source. This work, as a proof of principle study, paves the way toward few-cycle pulse generation of optical vortices at 2 μm. The presented light source can enable new research in the fields of interaction with organic materials, next generation optical detection, and optical vortex infrared supercontinuum.

关键词： laser cylindrical acceleration

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Atomistic Simulation of Undissociated 60°Basal Dislocation in Wurtzite GaN.

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Modeling and Numerical Simulation of Material Science 2013年第4期3卷 11-16页

作者： I.Belabbas J.Chen Ph.Komninou G.Nouet Groupe de Cristallographie et de Simulation des Matériaux Laboratoire de Physico-Chimie des Matériaux et Catalyse.Universite Abderrahmane MiraBejaia(06000)Algérie CIMAP UMR6252 CNRS-CEA-ENSICAEN-Universite de Caen Basse-Normandie14032France department of Physics Aristotle University of ThessalonikiGR-54124 ThessalonikiGreece Centre de Recherche sur les Ions les Matériaux et la Photonique6 Boulevard du Maréchal Juin14050 Caen cedexFrance

We have carried out computer atomistic simulations, based on an efficient density functional based tight binding method, to investigate the core configurations of the 60°basal dislocation in GaN wurtzite. Our energetic calculations, on the undissociated dislocation, demonstrate that the glide configuration with N polarity is the most energetically favorable over both the glide and the shuffle sets.

关键词： Gallium Nitride 60°Basal Dislocation Core Structure Energy Tight-binding SCC-DFTB

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Tailoring chiral optical properties by femtosecond laser direct writing in silica

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Light(Science & Applications) 2023年第3期12卷 366-378页

作者： Jiafeng Lu Jing Tian Bertrand Poumellec Enrique Garcia-Caurel Razvigor Ossikovski Xianglong Zeng Matthieu Lancry Institut de Chimie Moléculaire et des Matériaux d’Orsay UniversitéParis SaclayOrsay91405France Key Laboratory of Specialty Fiber Optics and Optical Access Networks Joint International Research Laboratory of Specialty Fiber Optics and Advanced CommunicationShanghai Institute for Advanced Communication and Data ScienceShanghai UniversityShanghai200444China LPICM CNRSEcole PolytechniqueInstitut Polytechnique de ParisPalaiseau91128France

An object that possesses chirality,that is,having its mirror image not overlayed on itself by rotation and translation,can provide a different optical response to a left-or right-handed circular polarized *** nanostructures may exhibit polarization-selective optical properties that can be controlled for micro-to-nano optical element *** attractive way to induce such complex nanostructures in three-dimension in glass is femtosecond laser direct ***,the mechanism of femtosecond laser induced chirality remains to be unveiled due to complex physical and chemical processes occurring during the ultrashort light-matter ***,a phenomenological model is proposed and is built on two-layers phase shifters to account for this laser-induced optical chirality in an initially achiral material(silica glass).This model is based on the observation that femtosecond laser induced nanogratings own two principal contributions to its aggregate birefringent response:a form and a stress-related *** refining this formalism,a multilayer approach is developed to imprint on demand optical *** up to+/-60°at 550 nm within an optimal 80μm thickness in silica glass are possible,corresponding to the highest value in a glass to *** results provide new insights of circular-optical control in micro-nano optical manufacturing and open new opportunities for photonics applications.

关键词： polarization silica circular

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Polarization shaping of Poincare´ beams by polariton oscillations

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Light(Science & Applications) 2015年第1期4卷 122-128页

作者： David Colas Lorenzo Dominici Stefano Donati Anastasiia A Pervishko Timothy CH Liew Ivan A Shelykh Dario Ballarini Milena de Giorgi Alberto Bramati Giuseppe Gigli Elena del Valle Fabrice P Laussy Alexey V Kavokin Daniele Sanvitto departamento de Fı´sica Teorica de la Materia Condensada and Condensed Matter Physics Center(IFIMAC) Universidad Autonoma de MadridE-28049Spain NANOTEC Istituto di Nanotecnologia-CNRVia Arnesano73100 LecceItaly Istituto Italiano di Tecnologia IIT-LecceVia Barsanti73010 LecceItaly Universita del Salento Via Arnesano73100 LecceItaly Division of Physics and Applied Physics Nanyang Technological University637371 SingaporeSingapore Science Institute University of IcelandDunhagi 3IS-107ReykjavikIceland Laboratory of Light-Matter Coupling in nanostructures ITMO University197101 St.PetersburgRussia laboratoire Kastler Brossel UPMC-Paris 6ENS et CNRS75005 ParisFrance Russian Quantum Center Novaya 100143025 SkolkovoMoscow RegionRussia CNR-SPIN Tor Vergataviale del Politechnico 1I-00133 RomeItaly

We propose theoretically and demonstrate experimentally the generation of light pulses whose polarization varies temporally to cover selected areas of the Poincare´sphere with both tunable swirling speed and total duration(1 ps and 10 ps,respectively,in our implementation).The effect relies on the Rabi oscillations of two polariton polarized fields excited by two counter-polarized and delayed *** superposition of the oscillating fields result in the precession of the Stokes vector of the emitted light while polariton lifetime imbalance results in its drift from a circle of controllable radius on the Poincare´sphere to a single point at long *** positioning of the initial circle and final point allows to engineer the type of polarization spanning,including a full sweeping of the Poincare´*** universality and simplicity of the scheme should allow for the deployment of time-varying full-Poincare´polarization fields in a variety of platforms,timescales,and regimes.

关键词： full Poincare beams polaritons polarization pulse shaping Rabi oscillations

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