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Micro-alloying of Zn and Ca in vacuum induction casted bioresorbable Mg system:Perspectives on corrosion resistance,cytocompatibility,and inflammatory response

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Journal of Magnesium and Alloys 2024年第7期12卷 2812-2825页

作者： Manisha Behera Agnès denys Rajashekhara Shabadi Fabrice Allain Cosmin Gruescu UnitéMatériaux et Transformations(UMET) Universitéde LilleCNRSINRAENSCLUMR 8207UMETF-59000 LilleFrance Universitéde Lille CNRSUMR 8576-UGSF-Unitéde Glycobiologie Structurale et FonctionnelleF-59000 LilleFrance

There is an increasing interest in biodegradable materials,such as magnesium,for orthopaedic *** is driven by their potential to address challenges like stress shielding and the need for secondary removal *** this study,biodegradable magnesium alloys were produced using the Vacuum Induction Casting *** impact of micro-alloying Zn and Ca in Mg-xZn-0.2Ca(x=0.1,0.2,0.3,and 0.4 wt%)alloys on corrosion resistance,cytocompatibility,and early-stage inflammatory response was *** and SEM-EDS analysis confirmed the presence of Ca_(2)Mg_(6)Zn_(3)secondary phases in all *** Mg-0.3Zn-0.2Ca alloy exhibited the lowest corrosion rate and an elastic modulus of 36.8 GPa,resembling that of natural *** measurements indicated a correlation between grain size and secondary phase volume fraction in explaining corrosion *** vitro degradation in simulated body fluid(SBF)for 21 days showed hydroxyapatite formation on alloy surfaces,aligning with electrochemical *** vitro cytotoxicity tests demonstrated the cytocompatibility of all alloys,with Mg-0.3Zn-0.2Ca having the highest cell viability over a 6-day cell *** into the inflammatory response with RAW-Blue macrophages revealed the anti-inflammatory properties of Mg-0.3Zn-0.2Ca ***-alloying with 0.3 wt%Zn and 0.2 wt%Ca enhanced mechanical properties,corrosion resistance,cytocompatibility,and immunomodulatory *** positions the Mg-0.3Zn-0.2Ca alloy as a promising biodegradable implant for bone fixation applications.

关键词： Micro-alloying MgZnCa Corrosion resistance In vitro Anti-inflammatory response

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Towards understanding the influence of Mg content on phase transformations in the La3-xMgxNi9 alloys by in-situ neutron powder diffraction study

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Progress in Natural Science:Materials International 2021年第5期31卷 698-704页

作者： Chu Bin Wan R.V.denys V.A.Yartys Institute for Energy Technology University of Science and Technology Beijing HYSTORSYS AS

The present work is focused on the studies of the phase-structural transformations in the La3-xMgxNi9(x = 1.0, 1.1 and 1.2) alloys as active materials of negative electrodes in the Nickel-Metal Hydride(Ni/MH) batteries. The phase equilibria and phase-structural transformations in the alloys were probed by in situ neutron powder diffraction(NPD) at the temperatures ranging from 300 K to 1273 K using the measurements of the equilibrated alloys at 8 setpoint temperatures of 300, 973, 1073, 1123, 1173, 1223, 1248 and 1273 *** by induction melting initial alloys were found to be multi-phase structured, containing up to 6 individual intermetallic compounds with different stoichiometric compositions. With the increase of the temperature and holding time, various transformations took place in the studied alloys. These included the formations and transformations of super-stacking intermetallics with variable ratios(La + Mg)/Ni, 1:3, 2:7 and 5:*** increasing temperatures, several systematic changes took place.(a) Abundances of(La,Mg)2Ni4AB2and(La,Mg)Ni3AB3type intermetallics gradually decreased before they melted/decomposed above 1073 K;(b) The(La,Mg)2Ni7A2B7type intermetallics began to decrease in abundances above 1123 K;(c) The transformation in the(La,Mg)5Ni19intermetallics from 3 R to 2 H proceeded above 1223 *** increase of Mg content had no obvious influence on(La,Mg)2Ni4and(La,Mg)2Ni7phases, and corresponding reactions R1 and R3 took place at the same temperatures as in the La–Ni system. However, with increasing Mg content the melting point of(La,Mg)5Ni19phase increased while the melting point of the(La,Mg)Ni3phase it decreased, leading to the variation of the reaction temperatures of the corresponding *** present study will assist in optimizing phase-structural composition of the alloys in the La–Mg–Ni system which contain Mg-modified layered structures by tailoring the high temperature annealing conditions.

关键词： Hydrogen absorbing materials Neutron powder diffraction In situ study La–Mg–Ni alloy Phase transformation

Dispersive Shallow Water Wave *** I:Model Derivation on a Globally Flat Space

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Communications in Computational Physics 2018年第1期23卷 1-29页

作者： Gayaz Khakimzyanov denys Dutykh Zinaida Fedotova Dimitrios Mitsotakis Institute of Computational Technologies Siberian Branch of the Russian Academy of SciencesNovosibirsk 630090Russia LAMA UMR 5127 CNRSUniversitéSavoie Mont BlancCampus Scientifique73376 Le Bourget-du-Lac CedexFrance Victoria University of Wellington School of MathematicsStatistics and Operations ResearchPO Box 600Wellington 6140New Zealand

In this paperwe reviewthe history and current state-of-the-art in modelling of long nonlinear dispersive *** the sake of conciseness of this review we omit the unidirectional models and focus especially on some classical and improved BOUSSINESQ-type and SERRE-GREEN-NAGHDI ***,we propose also a unified modelling framework which incorporates several well-known and some less known dispersive wave *** present manuscript is the first part of a series of two *** second part will be devoted to the numerical discretization of a practically important model on moving adaptive grids.

关键词： Long wave approximation nonlinear dispersive waves shallow water equations solitary waves

Host evolution in Mastomys natalensis(Rodentia:Muridae):An integrative approach using geometric morphometrics and genetics

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Integrative Zoology 2015年第6期10卷 505-514页

作者： Aude LALIS Allowen EVIN Marc JANIER Lamine KOIVOGUI Christiane denys UMR 7205 Institute of Systematic Evolution and Biodiversity(ISYEB)National Museum of Natural History CNRSSorbonne UniversitiesParisFrance Institute of Evolutionary Sciences-Montpellier(ISEM) University of MontpellierCNRSIRDEPHEMontpellierFrance Department of Archaeology University of AberdeenAberdeenUK Plateforme ANIMAGE-CREATIS Faculty of Medicine Lyon-EstClaude Bernard University Lyon 1LyonFrance National Institute of Public Health Guinea CHU DonkaConakryGuinea

The commensal rodent Mastomys natalensis is the natural reservoir of Lassa arenavirus(LASV),which causes hemorrhagic fever in West *** study a possible effect of the virus on phenotypic and genotypic variation of its persistently infected host,we compared LASV-positive and non-infected wild-caught *** LASV effects on the phenotypic variation were explored using standard external morphometric measurements,geometric morphometric analyses of the cranial size and shape,and brain case *** genetic variability of *** specimens was assessed using 9 polymorphic microsatellite *** of sex and age,LASV-infected animals had smaller external body measurements,reproductive organs,skull size and brain case *** shape differences between the 2 groups are represented by a lateral constriction of the entire *** genetic variability revealed consanguinity only among the LASV-positive *** hypothesize that growth impairment may result in a selective disadvantage for LASV-infected ***,leading to a preferably commensal lifestyle in areas where the LAVS is endemic and,thereby,increasing the risk of LASV transmission to humans.

关键词： host evolution genetic diversity inbreeding skull shape variation

Dispersive Shallow Water Wave *** II:Numerical Simulation on a Globally Flat Space

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Communications in Computational Physics 2018年第1期23卷 30-92页

作者： Gayaz Khakimzyanov denys Dutykh Oleg Gusev Nina Yu.Shokina Institute of Computational Technologies Siberian Branch of the Russian Academy of SciencesNovosibirsk 630090Russia LAMA UMR 5127 CNRSUniversitéSavoie Mont BlancCampus Scientifique73376 Le Bourget-du-Lac CedexFrance

In this paper we describe a numerical method to solve numerically the weakly dispersive fully nonlinear SERRE-GREEN-NAGHDI(SGN)celebrated ***,our scheme is based on reliable finite volume methods,proven to be very efficient for the hyperbolic part of *** particularity of our study is that we develop an adaptive numerical model using moving ***,we use a special form of the SGN equations where non-hydrostatic part of pressure is found by solving a linear elliptic ***,this form of governing equations allows to determine the natural form of boundary conditions to obtain a well-posed(numerical)problem.

关键词： Nonlinear dispersive waves non-hydrostatic pressure moving adaptive grids finite volumes conservative finite differences

A DNA origami plasmonic sensor with environment-independent read-out

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Nano Research 2019年第11期12卷 2900-2907页

作者： Valentina Masciotti Luca Piantanida denys Naumenko Heinz Amenitsch Mattia Fanetti Matjaz Valant Dongsheng Lei Gang Ren Marco Lazzarino CNR-IOM AREA Science ParkBasovizza TriesteI-34149Italy PhD Course in Nanotechnology University of TriesteTriesteI-34127Italy Institute for Physics of Semiconductors National Academy of Sciences of UkraineKyiv03028Ukraine Institute of Inorganic Chemistry Graz University of TechnologyGrazA-8010Austria Materials Research Laboratory University of Nova GoricaNova GoricaSI-5000Slovenia Institute of Fundamental and Frontier Sciences University of Electronic Science and Technology of ChinaChengdu610054China The Molecular Foundry Lawrence Berkeley National LaboratoryBerkeleyCA94720USA School of Physical Science and Technology Electron Microscopy Center of LZULanzhou UniversityLanzhou730000China Micron School of Materials Science&Engineering Boise State UniversityBoiseID 83725USA

DNA origami is a promising technology for its reproducibility,flexibility,scalability and *** the several potential applications,DNA origami has been proposed as a tool for drug delivery and as a contrast agent,since a conformational change upon specific target interaction may be used to release a drug or produce a physical signal,***,its conformation should be robust with respect to the properties of the medium in which either the recognition or the read-out take place,such as pressure,viscosity and any other unspecific interaction other than the desired target *** we report on the read-out robustness of a tetragonal DNA-origami/gold-nanoparticle hybrid structure able to change its configuration,which is transduced in a change of its plasmonic properties,upon interaction with a specific DNA *** investigated its response when analyzed in three different media:aqueous solution,solid support and viscous *** show that,once a conformational variation is produced,it remains unaffected by the subsequent physical interactions with the environment.

关键词： DNA origami plasmonic sensor molecular detection gold nanoparticle

Adaptation in brain structure and respiratory and olfactory structures across environmental gradients in African and North American muroid rodents

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Integrative Zoology 2024年第1期19卷 165-181页

作者： Peter J.TAYLOR Aluwani NENGOVHELA Christiane denys Graham R.SCOTT Catherine M.IVY Department of Zoology School of Natural and Mathematical SciencesUniversity of VendaThohoyandouSouth Africa Afromontane Unit Department of Zoology and EntomologyUniversity of the Free StatePhuthaditjhabaSouth Africa Department of Mammalogy National MuseumBloemfonteinSouth Africa Institut de Systématique EvolutionBiodiversité(ISYEB)Muséum National d’Histoire NaturelleCNRSSorbonne UniversitéEPHEUniversitéDes AntillesParisFrance Department of Biology McMaster UniversityHamiltonOntarioCanada Guglielmo and Shoemaker Labs Advanced Facility for Avian ResearchUniversity of Western OntarioLondonOntarioCanada

Morphometric studies of 3D micro CT-scanned images can provide insights into the evolution of the brain and sensory structures but such data are still scarce for the most diverse mammalian order of *** reviewed and new data,we tested for convergence to extreme aridity and high elevation in the sensory and brain morphology of rodents,from morphometric data from micro-CT X-ray scans of 174 crania of 16 species of three distantly re-lated African murid(soft-furred mice,Praomyini,laminate-toothed rats,Otomyini,and gerbils,Gerbillinae)clades and one North American cricetid(deer mice and white-footed mice,Peromyscus)*** studies demon-strated convergent evolution acting on the oval window area of the cochlea(enlarged in extremely arid-adapted species of Otomyini and Gerbillinae)and on endocranial volume(reduced in high elevation taxa of Otomyini and Peromyscus).However,contrary to our predictions,we did notfind evidence of convergence in brain struc-ture to aridity,or in the olfactory/respiratory system(turbinate bones)to high *** structure differed,particularly in the petrosal lobules of the cerebellum and the olfactory bulbs,between Otomyini and Gerbillinae,with extreme arid-adapted species in each clade being highly divergent(not convergent)from other species in the same *** observed greater“packing”of the maxillary turbinate bones,which have important respiratory functions,in Peromyscus mice from high and low elevations compared to the high-elevation African Praomyini,but more complex patterns within Peromyscus,probably related to trade-offs in respiratory physiology and heat exchange in the nasal epithelium associated with high-elevation adaptation.

关键词： 3D morphometrics Africa brain size North America Rodentia sensory evolution

MgCo2-D2 and MgCoNi-D2 systems synthesized at high pressures and interaction mechanism during the HDDR processing

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Progress in Natural Science:Materials International 2017年第1期27卷 74-80页

作者： Chubin Wan V.E.Antonov R.V.denys V.I.Kulakov V.A.Yartys University of Science and Technology Beijing Institute for Energy Technology Institute of Solid State Physics Russian Academy of Sciences HYSTORSYS AS Norwegian University of Science and Technology

MgCo2and MgNiCo crystallize with hexagonal Laves type intermetallic structures of the C14 type and do not form hydrides at ambient hydrogen pressures. However, applying high hydrogen pressures in the GPa range forces the hydrogen absorption and leads to the formation of multi-phase compositions, which contain approximately 2.5 atoms H per formula unit of MgCo2or MgNiCo and remain thermally stable under normal *** hydrogenation of MgCo2resulted in its decomposition to a ternary Mg2CoD5deuteride and metallic cobalt. Phase-structural transformations accompanying the vacuum desorption of deuterium in the temperature range of 27–500 °C were studied using in situ neutron powder diffraction. The investigation showed a complete recovery of the initial MgCo2intermetallic via a Hydrogenation-Disproportionation-Desorption-Recombination process. At 300°C, the Mg2CoD5deuteride first decomposed to elementary Mg and hexagonal Co. At 400°C, a MgCo phase was formed by interaction between Mg and Co. At the highest processing temperature of 500°C, a solid-state interaction of MgCo and Co resulted in the recovery of the initial *** interaction of MgNiCo with deuterium under the synthesis conditions of 2.8 GPa and 200 °C proceeded in a more complex way. A very stable ternary deuteride MgNi2D3was leached away while Co was separated in the form of Mg2CoD5and the remaining nickel formed a solid solution with Co with the approximate composition *** thermal desorption of deuterium from MgCo2D2.5and from MgNiCoD2.5has been studied by Thermal Desorption Spectroscopy with deuterium released into a closed volume. The observed effects nicely correlate with changes in the phase structural composition of the hydrides ***2is a new example of the hydrogen storage alloy, in which a successful HDDR processing results in the reversible formation of the initial intermetallic at much lower temperatures than in the equilibrium phase diagram of the Mg-Co system.

关键词： Intermetallics Hydrogen storage materials Neutron powder diffraction High pressure synthesis Phase-structural transformations Magnesium Cobalt Nickel

Synergistic Co-doping effect of CNTs and PVP in Na_(4)MnCr(PO_(4))3 cathode as a strategy for improving the electrochemical performance of SIBs

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Chinese Chemical Letters 2024年第2期35卷 539-543页

作者： Ruoyu Chen denys S.Butenko Shilin Li Xinyu Zhang Guangshe Li Igor V.Zatovsky Wei Han College of Physics State Key Laboratory of Inorganic Synthesis and Preparative ChemistryInternational Center of Future ScienceJilin UniversityChangchun 130012China Academy for Advanced Interdisciplinary Studies Southern University of Science and TechnologyShenzhen 518055China State Key Laboratory of Inorganic Synthesis and Preparative Chemistry College of ChemistryJilin UniversityChangchun 130012China F.D.Ovcharenko Institute of Biocolloidal Chemistry NAS UkraineKyiv 03142Ukraine

In order to solve the contradiction between the rapidly growing energy demand and the excessive exploitation of fossil fuels,it is urgent to research and develops more environmentally friendly and efficient energy storage ***,the development of high-performance cathode materials to enhance the energy density of SIB is currently one of the most important topics of scientific *** high-voltage and low-cost cathode material for SIBs,a composite of carbon-coated Na_(4)MnCr(PO_(4))_(3)(NASICON-type),polyvinylpyrrolidone(PVP),and modified carbon nanotubes(CNTs)is prepared by sol-gel and freeze-drying *** to the high conductivity of CNTs,the conductivity of the composite is significantly improved,and its initial capacity is increased to 114 mAh/g at 0.5 C and 96 mAh/g at 5 C(Mn^(2+)/Mn^(4+)conversion for voltage windows 1.4-4.3 V).Moreover,the multi-electrons transfer of Cr^(3+)/Cr^(4+) and Mn^(2+)/Mn^(4+) can provide a high capacity of 165 mAh/g at 0.1 C and 102 mAh/g at 5 C in the high voltage window of 1.4-4.6 ***,PVP can effectively inhibit the Jahn-Teller effect caused by Mn ion,making the composite have more excellent high-rate performance and *** addition,GITT,EIS and CV curves were drawn to better reveal the excellent kinetic properties of Na_(4)MnCr(PO_(4))_(3)@C@PVP@CNT cathode,and the mechanism of its performance improvement is deeply studied and ***,the co-doping of CNTs and PVP is a simple way to high conductivity and fast charging of cathode materials for SIBs.

关键词： Sodium-ion batteries Na_(4)MnCr(PO_(4))_(3) Carbon nanotubes Polyvinylpyrrolidone Synergistic effect

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