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Scalable batch fabrication of ultrathin flexible neural probes using a bioresorbable silk layer

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Microsystems & Nanoengineering 2022年第1期8卷 305-315页

作者： Clement Cointe Adrian laborde Lionel G.Nowak Dina N.Arvanitis David Bourrier Christian Bergaud Ali Maziz laAS-CNRS 7 Avenue du Colonel RocheF-31400 ToulouseFrance CerCo UniversitéToulouse 3CNRSPavillon BaudotCHU PurpanBP 2520231052 ToulouseFrance UMR institut national de la Santéet de la recherche Médicale 1048 Institut des Maladies Métaboliques et CardiovasculairesToulouseFrance

Flexible intracerebral probes for neural recording and electrical stimulation have been the focus of many research works to achieve better compliance with the surrounding tissue while minimizing *** have been explored to find the best way to insert flexible probes into the brain while maintaining their flexibility once ***,we present a novel and versatile scalable batch fabrication approach to deliver ultrathin and flexible probes consisting of a silk-parylene *** biodegradable silk layer,whose degradation time is programmable,provides a temporary and programmable stiffener to allow the insertion of ultrathin parylene-based flexible *** innovative and robust batch fabrication technology allows complete freedom over probe design in terms of materials,size,shape,and *** demonstrate successful ex vivo insertion of the probe with acute high-fidelity recordings of epileptic seizures in field potentials as well as single-unit action potentials in mouse brain *** novel technological solution for implanting ultraflexible devices in the brain while minimizing rejection risks shows high potential for use in both brain research and clinical therapies.

关键词： batch recording insertion

Atomically Dispersed Fe-Co Bimetallic Catalysts for the Promoted Electroreduction of Carbon Dioxide

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Nano-Micro Letters 2022年第2期14卷 79-93页

作者： Zhangsen Chen Gaixia Zhang Yuren Wen Ning Chen Weifeng Chen Tom Regier James Dynes Yi Zheng Shuhui Sun institut national de la recherche scientifique-Énergie Matériaux et Télécommunications VarennesQC J3X 1P7Canada School of Materials Science and Engineering University of Science and Technology100083 BeijingPeople’s Republic of China Canadian Light Source University of SaskatchewanSaskatoonSK S7N 2V3Canada Research institute of Photocatalysis State Key Laboratory of Photocatalysis on Energy and EnvironmentFuzhou UniversityFuzhou 350116People’s Republic of China

The electroreduction reaction of CO_(2)(ECO_(2)RR)requires high-performance catalysts to convert CO_(2)into useful *** metal-based atomically dispersed catalysts are promising for the high selectivity and activity in ECO_(2)*** work presents a series of atomically dispersed Co,Fe bimetallic catalysts by carbonizing the Fe-introduced Co-zeolitic-imidazolate-framework(C-Fe-Co-ZIF)for the syngas generation from ECO_(2)*** synergistic effect of the bimetallic catalyst promotes CO *** to the pure C-Co-ZiF,C-Fe-Co-ZIF facilitates CO production with a CO Faradaic efficiency(FE)boost of 10%,with optimal FE_(CO)of 51.9%,FE_(H_(2))of 42.4%at-0.55 V,and CO current density of 8.0 mA cm^(-2)at-0.7 V versus reversible hydrogen electrode(RHE).The H_(2)/CO ratio is tunable from 0.8 to 4.2 in a wide potential window of-0.35 to-0.8 V versus *** total FE_(CO+H_(2))maintains as high as 93%over 10 *** proper adding amount of Fe could increase the number of active sites and create mild distortions for the nanoscopic environments of Co and Fe,which is essential for the enhancement of the CO production in ECO_(2)*** positive impacts of Cu-Co and Ni-Co bimetallic catalysts demonstrate the versatility and potential application of the bimetallic strategy for ECO_(2)RR.

关键词： CO_(2)reduction Electrocatalysis Syngas production Cobalt Iron Bimetallic catalysts

Impact of nanocrystallinity segregation on the growth and morphology of nanocrystal superlattices

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Nano Research 2013年第8期6卷 611-618页

作者： Yanfen Wan Herve Portals Nicolas Goubet Alain Mermet Marie-Paule Pileni Université Pierre et Marie Curie Paris 6 UMR 7070 LM2N 8P 52 4 place Jussieu 75005 Paris France Centre national de la recherche scientifique Unitd Mixte de Recherche 7070 LM2N 4 place Jussieu 75005 Paris France Université Lyon I Institut Lumiére Matiére Unité Mixte de Recherche 5306 CNRS Bāt. A. Kastler 10 rueAda Byron 69622 Villeurbanne France

A colloidal solution of 5 nm Au tetradecanethiol-coated nanoparticles is syn-thesized. After fast evaporation of one drop, ordered monolayers both composed of single domain and polycrystalline nanocrystals are obtained. On increasing the amount of materials and the evaporation time, nanocrystal films with irregular outlines are produced together with close-packed 3D superlattices exhibiting a truncated-tetrahedral shape. Using low-frequency micro-Raman scattering spectroscopy and electron microscopy the building block nanocrystallinity is characterized. Spontaneous nanocrystallinity segregation is revealed： the truncated-tetrahedral supracrystals are shown to mainly contain single domain building blocks while the supracrystalline films are composed of a mixture of single domain and polycrystalline nanocrystals. This observation points out the correlation between the nanocrystallinity segregation involved in the growth of the nanocrystal superlattices and their morphology.

关键词： supracrystals close-packed self-assembly metal nanoparticles Raman scatteringspectroscopy

Toward carbon neutrality by artificial photosynthesis

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Frontiers in Energy 2024年第1期18卷 54-55页

作者： Baowen ZHOU Minhua SHAO Sharif Md.SADAF Shuhui SUN Key laboratory for Power Machinery and Engineering of the Ministry of Education Research Center of Renewable Synthetic FuelSchool of Mechanical EngineeringShanghai Jiao Tong UniversityShanghai 200240China department of Chemical and Biological Engineering Energy InstituteThe Hong Kong University of Science and TechnologyHong KongChina institut national de la recherche scientifique(INRS)-CenterÉnergie Matériaux Télécommunications VarennesQuebec J3X 1P7Canada

CO_(2)is not only the primary cause of climate change but also an abundant and recyclable carbon *** breakthrough in emerging disruptive technologies such as carbon capture and storage(CCS),power-to-X,and direct air capture(DAC)is fundamental to achieving carbon *** these technologies,artificial photosynthesis offers an attractive method for recycling carbon dioxide and water into fuels and chemicals using solar energy(CO_(2)+H_(2)O+sunlight→fuels+chemicals).It holds great promise for addressing the critical challenges associated with elevated CO_(2)concentrations and securing a sustainable supply of fuels and chemicals for economic sectors.

关键词： neutral holds breakthrough

Effect of self-weight consolidation on a hydro-sedimentological model for the Río de la Plata estuary

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International Journal of Sediment Research 2019年第5期34卷 444-454页

作者： Pablo Santoro Mónica Fossati Pablo Tassi Nicolas Huybrechts Damien Pham Van Bang Ismael Piedra-Cueva instituto de Mecánica de los Fluidos e Ingeniería Ambiental Facultad de Ingeniería Universidad de la República Université Paris-Est Laboratory for Hydraulics Saint-Venant (ENPC-EDF/R& D-CEREMA) Electricity of France R&D Department Sorbonne Universités Université de Technologie de Compiègne FRE UTC-CNRS 3023 Roberval Centre de Recherche Royallieu Cerema Direction Technique Eau Mer et Fleuves institut national de la recherche scientifique Centre-Eau Terre Environnement

The effect of the consolidation process on the morphodynamics and fine sediment dynamics of the Río de la Plata estuary is explored through a circulation-wave-sediment transport model. The consolidation model is calibrated based on settling column experimental data. Different simulations are done in order to initialize the mud layer distribution and to investigate the impact of different erosion parameter assumptions on the modeled sediment dynamics. Finally a two-year simulation is done with and without the consolidation process and realistic hydrodynamic forcings. Considering the consolidation process, the model correctly reproduces measured vertical density profiles in the Montevideo Bay access channel. The simulated suspended sediment dynamics behavior in Montevideo Bay with the consolidation process provides a more realistic deposition pattern in regard to the dredging activities.

关键词： Cohesive sediment Self-weight consolidation Morphodynamics Numerical modeling

The degradation of cathodic Fe/N/C catalyst in PEMFCs:The evolution of remanent active sites after demetallation

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Journal of Materials Science & Technology 2024年第6期173卷 100-106页

作者： Xiaohua Yang Wentao Sun Jiatang Chen Yang Gao Rongxian Zhang Qun Luo Tao Lyu Lei Du institut national de la recherche scientifique-Énergie Matériaux et Télécommunications J3X 1P7 VarennesQCCanada School of Chemistry and Chemical Engineering Jiangsu UniversityZhenjiang 212013China State Key laboratory of Advanced Special Steels&Shanghai Key laboratory of Advanced Ferrometallurgy School of Materials Science and EngineeringShanghai UniversityShanghai 200444China Huangpu Hydrogen Energy Innovation Center School of Chemistry and Chemical EngineeringGuangzhou UniversityGuangzhou 510006China

The state-of-the-art Fe/N/C catalyst has presented comparable initial cathode performance to the benchmark Pt/C catalyst in proton exchange membrane fuel cells(PEMFCs).However,the major bottleneck is its significant activity decay in real-world PEMFC *** superposed“fast decay”and“slow decay”have been well documented to describe the degradation process of Fe/N/C catalysts during PEMFC *** fast decay has been well understood in close relation to the demetallation at the initial 15-h stability ***,it is still unclear how the remanent active sites evolve after *** this end,the catalyst performance and evolution of a typical Fe/N/C active site were herein investigated through postmortem characterizations of the membrane electrode assemblies(MEAs)after different *** is presented that 1 bar pressure and 80℃ temperature are the optimized conditions for Fe/N/C ***,the“fast decay”in the initial 15 h is immune to the various operating parameters,while the“slow decay”highly depends on the applied temperature and *** to the X-ray absorption spectra(XAS)analysis and stability test of MEA,the gradual evolution of Fe-N coordination to Fe-O is found correlated with the“slow decay”and accounts for the catalyst decay after the demetallation process.

关键词： Fe/N/C Stability decay mechanism Metal oxidation PEMFCs

A facial reconstruction method based on new mesh deformation techniques

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Forensic Sciences Research 2018年第3期3卷 256-272页

作者： Maya de Buhan Chiara Nardoni Centre national de la recherche scientifique Unitémixte de recherche 8145Laboratoire de Mathematiques Appliquées de Paris DescartesUniversitéParis DescartesSorbonne Paris CitéParisFrance Sorbonne Universités UPMC Univ Paris 06Institut des Sciences du Calcul et des DonnéesParisFrance

This article presents a new numerical method for facial *** problem is the following:given a dry skull,reconstruct a virtual face that would help in the identification of the *** approach combines classical features as the use of a skulls/faces database and more original aspects:(1)an original shape matching method is used to link the unknown skull to the database templates;(2)the final face is seen as an elastic 3D mask that is deformed and adapted onto the unknown *** this method,the skull is considered as a whole surface and not restricted to some anatomical landmarks,allowing a dense description of the skull/face ***,the approach is fully *** results are presented to show its efficiency.

关键词： Forensic science facial reconstruction shape matching elasticity soft tissue deformation finite elements

For antigen-specific effector or Foxp3^(+) regulatory T cell fate, cyclin-dependent kinases hold the trump card

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Cellular & Molecular Immunology 2020年第4期17卷 310-312页

作者： Srinivasa Reddy Bonam Jagadeesh Bayry Neuroimmunology&peptide therapy Biotechnology and cell signalingCNRS-University of StrasbourgIllkirch 67412 StrasbourgFrance institut national de la Santéet de la recherche Médicale Centre de Recherche des CordeliersEquipe-Immunopathologie et Immunointervention ThérapeutiqueSorbonne UniversitéUniversitéParis DescartesSorbonne Paris CitéParis F-75006France

Forkhead box p3^(+)(Foxp3^(+))regulatory T cells(Tregs)are indispensable for immune homeostasis and for maintaining immune *** studies have confirmed that injection of a T cell population depleted of Tregs causes autoimmunity,rejection of grafts and inflammatory disorders,whereas reconstitution with Tregs inhibits these pathogenic *** the last two decades,intense efforts have been made to identify Treg subsets,Treg differentiation processes,and the molecular signatures and regulators that determine Treg lineage specificity and stability.1–6 Several lines of evidence clearly demonstrate that Foxp3^(+)Tregs do not constitute a homogeneous population,and various subsets of Tregs,such as thymic Tregs(tTregs),in vitro-generated Tregs(iTregs),and peripherally induced Tregs(pTregs),have been identified.5 In addition to Foxp3,epigenetic factors and metabolic processes play key roles in maintaining Treg identity and function,and mediate the switch between effector T cells and Tregs.

关键词： Foxp3 specificity homeostasis

Rare earth element-modified MOF materials:synthesis and photocatalytic applications in environmental remediation

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Rare Metals 2024年第4期43卷 1390-1406页

作者： Shu-Kun Le Qi-Jie Jin Jia-Ao Han Hua-Cong Zhou Quan-Sheng Liu Fu Yang Jie Miao Pei-Pei Liu Cheng-Zhang Zhu Hai-Tao Xu Inner Mongolia Key laboratory of High-Value Functional Utilization of Low Rank Carbon Resources Chemical Engineering CollegeInner Mongolia University of TechnologyHohhot010050China School of Environmental Science and Engineering Nanjing Tech UniversityNanjing210009China School of Environmental and Chemical Engineering Jiangsu University of Science and TechnologyZhenjiang212100China institut national de la recherche scientifique-Énergie Matériaux et Télécommunications MontrealQCJ3X 1P7Canada

Metal-organic framework-like materials(MOFs)have been developed in the fields of photocatalysis for their excellent optical properties and physicochemical properties,including environmental remediation,CO_(2)photoreduction,water splitting,and so *** their important roles in various fields,rare earth elements have received growing interests from *** MOFs with rare earth elements for modification allows broadening the absorption spectrum,while the active electrons on their empty 4f orbitals can act as traps to capture photoexcited carriers to inhibit the recombination of electron-hole pairs,thus promoting photocatalytic ***,rare earth elements modified MOFs provide an attractive way to achieve their high value *** this mini-review,the synthesis of rare earth element-modified MOFs photocatalysts and corresponding applications in the removal of antibiotics,CO_(2)reduction,and hydrogen production are constructively summarized and ***,the latest advancements and current difficulties of these materials as well as the application prospects are also provided.

关键词： Rare earth metals MOFs Photocatalytic CO_(2) reduction Environmental remediation Water splitting