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Acetic acid additive in NaNO_(3)aqueous electrolyte for long-lifespan Mg-air batteries

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Journal of Magnesium and Alloys 2024年第2期12卷 825-839页

作者： Yaqing Zhou Fan Sun Gunahua Lin Sandrine Zanna Antoine Seyeux Philippe Marcus Jolanta´Swiatowska Chimie ParisTech-CNRS PSL UniversityInstitut de Recherche de Chimie Paris11 rue Pierre et Marie CurieParis 75005France

Mg-air batteries have attracted tremendous attention as a potential next-generation power source for portable electronics and e-transportation due to their remarkable high theoretical volumetric energy density,environmental sustainability,and cost-effectiveness.However,the fast hydrogen evolution reaction(HER)in NaCl-based aqueous electrolytes impairs the performance of Mg-air batteries and leads to poor specific capacity,low energy density,and low utilization.Thus,the conventionally used NaCl solute was proposed to be replaced by NaNO_(3)and acetic acid additive as a corrosion inhibitor,therefore an electrolyte engineering for long-life time Mg-air batteries is reported.The resulting Mg-air batteries based on this optimized electrolyte demonstrate an improved discharge voltage reaching~1.8 V for initial 5 h at a current density of 0.5 mA/cm^(2) and significantly prolonged cells'operational lifetime to over 360 h,in contrast to only~17 h observed in NaCl electrolyte.X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry were employed to analyse the composition of surface film and scanning electron microscopy combined with transmission electron microscopy to clarify the morphology changes of the surface layer as a function of acetic acid addition.The thorough studies of chemical composition and morphology of corrosion products have allowed us to elucidate the working mechanism of Mg anode in this optimized electrolyte for Mg-air batteries.

关键词： Acetic acid additive in NaNO_(3)electrolyte Electrolyte engineering Corrosion surface film Surface characterization Hydrogen evolution

Recent Progress in Fluorescent Vesicles with Aggregation-induced Emission

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Chinese Journal of Polymer Science 2019年第4期37卷 352-371,I0006页

作者： Hui Chen Min-Hui Li Chimie ParisTech PSL University ParisCNRSInstitut de Recherche de Chimie Paris Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical Technology

Fluorescent vesicles have recently attracted increasing attention because of their potential applications in bioimaging,diagnostics, and theranostics, for example, in vivo study of the delivery and the distribution of active substances. However, fluorescent vesicles containing conventional organic dyes often suffer from the problem of aggregation-caused quenching(ACQ) of fluorescence.Fluorescent vesicles working with aggregation-induced emission(AIE) offer an extraordinary tool to tackle the ACQ issue, showing advantages such as high emission efficiency, superior photophysical stability, low background interference, and high sensitivity. AIE fluorescent vesicles represent a new type of fluorescent and functional nanomaterials. In this review, we summarize the recent advances in the development of AIE fluorescent vesicles. The review is organized according to the chemical structures and architectures of the amphiphilic molecules that constitute the AIE vesicles, i.e., small-molecule amphiphiles, amphiphilic polymers, and amphiphilic supramolecules and supramacromolecules. The studies on the applications of these AIE vesicles as stimuli-responsive vesicles,fluorescence-guided drug release carriers, cell imaging tools, and fluorescent materials based on fluorescence resonance energy transfer(FRET) are also discussed.

关键词： Vesicles Polymersomes Aggregation-induced emission Small-molecule amphiphiles Amphiphilic polymers Amphiphilic supramolecules Amphiphilic supramacromolecules

Twinning-induced plasticity(TWIP)effect in multi-phase metastable beta Zr-Nb alloys

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Journal of Materials Science & Technology 2023年第8期139卷 120-125页

作者： Junhui Tang Ahmed Zorgati Jean-Baptiste Philippe Vermaut Frédéric Prim Fan Sun PSL Research University Chimie ParisTechCNRS-UMR8247Institut de Recherche de Chimie ParisParis 75005France Sorbonne University Ecole PolytechniquePalaiseau 91128France Gaillard Paris-Saclay University Commissariatàl’Energie AtomiqueService d’Etude des Matériaux IrradiésGif-Sur-Yvette 911191France PSL Research University Chimie ParisTechCNRS-UMR8247Institut de Recherche de Chimie ParisParis 75005France Sorbonne UniversityUPMC University ParisUFR926Paris 75005France

During the last decades,a large amount of scientific works had been devoted toβ-type Zr and Ti alloys for biomedical applica-tions due to their high strength,good corrosion resistance,low magnetic susceptibility and ... 详细信息

关键词： alloys corrosion resistance

Large-Size Honeycomb-Shaped and Iris-Like Liquid Crystal Elastomer Actuators

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CCS Chemistry 2022年第3期4卷 847-854页

作者： Bin Ni Gaoyu Liu Mengxue Zhang Patrick Keller Michael Tatoulian Min-Hui Li Chimie ParisTech UniversitéParis Sciences&LettresCNRSInstitut de Recherche de Chimie ParisUMR824775005 Paris Institut Curie UniversitéParis Sciences&LettresCNRSSorbonne UniversitéLaboratoire Physico-Chimie CurieUMR16875005 Paris

Nature is providing inspiration for researchers to mimic its functions or existing structures,which could remarkably promote the development of new materials.Here,a large-size honeycomb-shaped liquid crystal elastomer(LCE)actuator with LC orientation along the height of the honeycomb shape is built by combining magnetic field alignment and soft lithography technology.This homeotropic alignment allowed the height contraction of honeycomb and pore size expansion of hexagons in a reversible manner upon temperature variation.Therefore,this LCE actuator can be used as a structure for temperature-gated separation of particles.Another example is an iris-like LCE actuator,which has the capability of adjusting its aperture size with a temperature variation.Our approach provides a simple way to design customizable sophisticated LCE actuators for various potential applications.

关键词： liquid crystal elastomers soft actuators biomimetic systems

Iron-catalyzed reductive cyclization of nitroarenes: Synthesis of aza-heterocycles and DFT calculations

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Chinese Chemical Letters 2023年第3期34卷 337-341页

作者： Christine Tran Aicha Abdallah Valentin Duchemann Guillaume Lefevre Abdallah Hamze CNRS BioCISUniversitéParis-SaclayChatenay-Malabry 92290France Chimie ParisTech CNRSInstitute of Chemistry for Life and Health SciencesPSL UniversityCSB2DParis 75005France

Research into environmentally friendly strategies for hydrogen transfer reduction is increasing, along with the need for more elaborate heterocyclic platforms. Within this context, we develop a new approach for substituted dihydrobenzo[c]carbazoles and indoles. These compounds were synthesized through an iron-catalyzed hydrogen transfer reduction of nitroarenes, followed by intramolecular cyclization. This transformation involves using a Kn?lker-type catalyst, Cs_(2)CO_(3) as the base, and benzyl alcohol as the nonexpensive and low volatile hydrogen donor. We synthesize 30 examples of aza-heterocycles with moderate to excellent yields by applying this strategy. Additionally, DFT calculations demonstrated that the pathway reaction could follow an anionic mechanism.

关键词： Iron Cyclization Nitroarenes Dihydrobenzo[c]carbazoles Indoles

Tunable UCST thermoresponsive copolymers based on natural glycyrrhetinic acid

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Chinese Chemical Letters 2021年第1期32卷 548-552页

作者： Yiran Zhao Jingyao Ma Xia Yu Min-Hui Li Jun Hu Beijing Advanced Innovation Center for Soft Matter Science and Engineering Beijing University of Chemical TechnologyBeijing 100029China Institut de Recherche de chimie Paris Chimie ParisTechPSL Research UniversityCNRSParis 75005France

Water-soluble thermoresponsive polymers present either upper critical solution temperature(UCST) or lower critical solution tempe rature(LCST) depending on the location of their miscibility range with water at high temperatures or at low temperatures.Compared with LCST polymers,the water-soluble UCST polymers are still less explored until now.In this work three copolymers of P(AAm-co-GAA) were synthesized by copolymerizing two acrylamide monomers,acrylamide(AAm) and acrylamide functionalized with natural glycyrrhetinic acid(GAA),using reversible addition-fragmentation chain transfer(RAFT) polymerization.These copolymers exhibited the typical UCST thermoresponsive behavior,and their phase transition temperatures could be easily tuned to around 37℃ for potential biological applications.Moreover,the UCST of P(AAm-co-GAA) can be adjusted not only by the content of glycyrrhetinic acid(GA) and polymer concentrations,but also by the host-guest interactions between GA and cyclodextrins(β-and γ-CD).The suitable value of UCST and the biocompatible nature of GA and CDs may endow these copolymers with practical applications in biomedical chemistry.

关键词： Thermo-responsive polymer UCST Glycyrrhetinic acid Natural product Cyclodextrin

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可移动的长寿命相干光存储器

Science Bulletin 2022年第23期67卷 2402-2405,M0003页

作者：周宗权陈铎仑靳明郑亮马有志涂涛 Alban Ferrier Philippe Goldner 李传锋郭光灿 CAS key Laboratory of Quantum Information University of Science and Technology of ChinaHefei 230026China CAS Center for Excellence in Quantum Information and Quantum Physics University of Science and Technology of ChinaHefei 230026China Hefei National Laboratory University of Science and Technology of ChinaHefei 230088China Chimie ParisTech PSL UniversityCNRSInstitut de Recherche de Chimie ParisParis 75005France Faculte des Sciences et Ingenierie Sorbonne UniversiteUFR933Paris 75005France

光是现代信息传输的基本载体.长寿命的光存储既具有基础物理方面的价值,也在光信息处理领域具有广泛的应用.本文提出一种新型的光存储方案:自旋锁定受激光子回波(简称SLSE).基于该方案,作者在掺铕硅酸钇(Eu:YSO)晶体中实现了可移动的长... 详细信息

光是现代信息传输的基本载体.长寿命的光存储既具有基础物理方面的价值,也在光信息处理领域具有广泛的应用.本文提出一种新型的光存储方案:自旋锁定受激光子回波(简称SLSE).基于该方案,作者在掺铕硅酸钇(Eu:YSO)晶体中实现了可移动的长寿命相干光存储器.存储器及其配套设备实现整体封装并放置在一个电控导轨上往返搬运.在1 h的存储时间里,存储器及其存储的轨道角动量编码光场共被搬运了24 m的距离.结合带宽压缩等量子光学技术,可移动相干光存储器可应用于构建甚长基线光学干涉望远镜.作为一种光传输的新媒介,可移动相干光存储有望进一步催生出更多新的应用.

关键词：存储器光存储相干光光信息处理轨道角动量量子光学基础物理光学干涉

纳米尺度下304不锈钢表面钝化机制及预氧化影响

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纳米尺度下304不锈钢表面钝化机制及预氧化影响

Advanced protection against environmental degradation of silver mirror stacks for space application

第十一届全国腐蚀与防护大会

作者： Li Ma Frédéric Wiame Vincent Maurice Philippe Marcus PSL Research University CNRS-Chimie ParisTech 复旦大学材料科学系珠海复旦创新研究院

不锈钢的抗腐蚀性能来源于表面厚度为3-5纳米的超薄氧化膜（钝化膜）。该薄膜有效地将金属合金基材与腐蚀性环境隔离,从而提供长期抗腐蚀保护1。但是,在例如含氯化物的环境中,钝化膜会出现局部失效,并在没有自我修复的情况下导致局部腐... 详细信息

不锈钢的抗腐蚀性能来源于表面厚度为3-5纳米的超薄氧化膜（钝化膜）。该薄膜有效地将金属合金基材与腐蚀性环境隔离,从而提供长期抗腐蚀保护1。但是,在例如含氯化物的环境中,钝化膜会出现局部失效,并在没有自我修复的情况下导致局部腐蚀。目前,根据铁素体和奥氏体的钝化表面分析研究表明,钝化膜具有显着Cr（Ⅲ）富集2。最新的微观尺度上表面氧化膜研究表明,在纳米尺度上产生的Cr（Ⅲ）贫化会导致薄膜的化学/结构上异质性3。这类纳米/原子表面异质性是表面氧化膜初始生长机制和预钝化机制的关键影响因素,也被认为是钝化膜稳定性失效的来源。因此,提高不锈钢防腐钝化膜的稳定性不仅需要更好地了解铬富集的纳米级氧化机制,还需要彻底研究不同氧化预处理表面的电化学钝化行为4。X射线光电子能谱（XPS）和扫描隧道显微镜（STM）用于研究FeCrNi（100）表面在室温下,在超低纯氧暴露量下的形貌和结构变化5。超高真空实验系统确保制备原子级别的清洁表面,便于初始氧化阶段（0-100 L）的实现与测试。电化学表征用于检验制备的不同氧化膜的钝化行为。结果表明,初始氧化阶段具有氧化物2D成核和3D生长两个明显阶段,直至表面完全被Cr（Ⅲ）富集的纳米氧化颗粒完全覆盖,形成氧饱和表面膜。金属铁和铬在数个原子层内的局部扩散是在氧化膜纳米级异质性的来源。预氧化显着促进氧化膜Cr（Ⅲ）的富集,并在含水环境中阻碍/延迟随后的铁氧化。在OCP硫酸中钝化过程中,铁氧化物优先溶解;预氧化促进Cr（Ⅲ）氢氧化物的形成,从而提高纳米颗粒氧化膜的致密性。在-0.1 V极化时,Cr（Ⅲ）氢氧化物出现分解,进一步导致Cr（Ⅲ）富集。此项工作为铬富集氧化膜的成分和形态调整提供纳米尺度的理解。

关键词：不锈钢氧化机理钝化机理 XPS STM

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Journal of Materials Science & Technology 2021年第5期64卷 1-9页

作者： Rajendra Kurapati Vincent Maurice Antoine Seyeux Lorena H.Klein Dimitri Mercier Gregory Chauveau Catherine Grees-Besset Loic Berthod Philippe Marcus PSL Research University CNRS-Chimie ParisTechInstitut De Recherche De Chimie ParisPhysical Chemistry of Surfaces Group11 Rue Pierre Et Marie Curie75005 ParisFrance CILAS MARSEILLE 600 Avenue De La Roche FourcadePole ALPHA Sud-Saint Mitre13400 AubagneFrance CNES Sous-direction Assurance QualitéService TechnologiesMatériaux Et Procédés18 AvenueÉdouard Belin31401 ToulouseFrance

Protection of silver mirror stacks from environmental degradation before launching is crucial for space applications.Hereby,we report a comparative study of the advanced protection of silver mirror stacks for space telescopes provided by SiO_(2)and Al_(2)O_(3)coatings in conditions of accelerated aging by sulfida-tion.The model silver stack samples were deposited by cathodic magnetron sputtering on a reference silica substrate for optical applications and a surface-pretreated SiC substrate.Accelerated aging was per-formed in dry and more severe wet conditions.Optical micrographic observations,surface and interface analysis by Time-of Flight Secondary Ion Mass Spectrometry(ToF-SIMS)and reflectivity measurements were combined to comparatively study the effects of degradation.The results show a lower kinetics of degradation by accelerated aging of the stacks protected by the alumina coating in comparable test conditions.

关键词： Mirror layers Protection Layers Silver Atmospheric corrosion Accelerated aging Surface analysis Space applications