Littérature scientifique sur le sujet « Nanostructures et nanocomposites »
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Articles de revues sur le sujet "Nanostructures et nanocomposites"
Doan, Mai Quan, Nguyen Ha Anh, Hoang Van Tuan, Nguyen Cong Tu, Nguyen Huu Lam, Nguyen Tien Khi, Vu Ngoc Phan, Pham Duc Thang et Anh-Tuan Le. « Improving SERS Sensing Efficiency and Catalytic Reduction Activity in Multifunctional Ternary Ag-TiO2-GO Nanostructures : Roles of Electron Transfer Process on Performance Enhancement ». Adsorption Science & ; Technology 2021 (1 octobre 2021) : 1–13. http://dx.doi.org/10.1155/2021/1169599.
Texte intégralHammud, Hassan H., Ranjith Kumar Karnati, Nusaybah Alotaibi, Syed Ghazanfar Hussain et Thirumurugan Prakasam. « Cobalt–Carbon Nanoparticles with Silica Support for Uptake of Cationic and Anionic Dyes from Polluted Water ». Molecules 26, no 24 (10 décembre 2021) : 7489. http://dx.doi.org/10.3390/molecules26247489.
Texte intégralGranitzer, Petra, Klemens Rumpf, Roberto Gonzalez-Rodriguez et Jeffery Coffer. « Metal Filled Nanostructured Silicon a Platform to Interlink Magnetism and Optics ». ECS Meeting Abstracts MA2023-02, no 21 (22 décembre 2023) : 1285. http://dx.doi.org/10.1149/ma2023-02211285mtgabs.
Texte intégralEl-Zoka, Ayman A. « (Invited) Making Nanostructured Composites Via Inner-Pore Electrodeposition into Nanoporous Metals ». ECS Meeting Abstracts MA2023-02, no 21 (22 décembre 2023) : 1281. http://dx.doi.org/10.1149/ma2023-02211281mtgabs.
Texte intégralRusu, Mihai M., Adriana Vulpoi, Isabelle Maurin, Liviu C. Cotet, Lucian C. Pop, Carmen I. Fort, Monica Baia, Lucian Baia et Ileana Florea. « Thermal Evolution of C–Fe–Bi Nanocomposite System : From Nanoparticle Formation to Heterogeneous Graphitization Stage ». Microscopy and Microanalysis 28, no 2 (1 mars 2022) : 317–29. http://dx.doi.org/10.1017/s1431927622000241.
Texte intégralGan’shina, Elena A., Vladimir V. Garshin, Nikita S. Builov, Nikolay N. Zubar, Alexandr V. Sitnikov et Evelina P. Domashevskaya. « Investigation of the Magnetic Properties of Amorphous Multilayer Nanostructures [(CoFeB)60C40/SiO2]200 and [(CoFeB)34(SiO2)66/C]46 by the Transversal Kerr Effect ». Kondensirovannye sredy i mezhfaznye granitsy = Condensed Matter and Interphases 22, no 4 (15 décembre 2020) : 438–45. http://dx.doi.org/10.17308/kcmf.2020.22/3114.
Texte intégralNgene, Peter. « Interface Induced Fast Ion Conduction in Complex Hydride/Oxide Nanocomposites : Interplay between Hydride and Oxide Properties ». ECS Meeting Abstracts MA2023-02, no 5 (22 décembre 2023) : 886. http://dx.doi.org/10.1149/ma2023-025886mtgabs.
Texte intégralYang, Bao Juan, Rui Xia, Su Bin Jiang et Mei Zhen Gao. « SnSe/Cu<sub>2</sub>SnSe<sub>3</sub> ; Heterojunction Structure with High Initial Coulombic Efficiency for Lithium-Ion Battery Anodes ». Key Engineering Materials 905 (4 janvier 2022) : 135–41. http://dx.doi.org/10.4028/www.scientific.net/kem.905.135.
Texte intégralUrper, Osman, Prabin Kharel, Nivedhitha Jothinarayanan, Karoline Krogstad, Lars Eric-Roseng, Miina Saebo, Walter Aker et Kaiying Wang. « Eco-Friendly TiO2 and ZnO Biocar Nanocomposites : Transforming Water Decontamination and Bacteria Inactivation ». ECS Meeting Abstracts MA2023-02, no 47 (22 décembre 2023) : 2292. http://dx.doi.org/10.1149/ma2023-02472292mtgabs.
Texte intégralSteier, Katharina, Peter James Kelly et Justyna Kulczyk-Malecka. « Vanadium-Doped Ni/YSZ Anode Functional Layers for Solid Oxide Fuel Cells Produced via Magnetron Sputtering ». ECS Meeting Abstracts MA2023-01, no 54 (28 août 2023) : 76. http://dx.doi.org/10.1149/ma2023-015476mtgabs.
Texte intégralThèses sur le sujet "Nanostructures et nanocomposites"
Belchi, Raphaëlle. « Architectures à base de nanostructures de carbone et TiO₂pour le photovoltaïque ». Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS329/document.
Texte intégralPhotovoltaic is a promising renewable energy to tackle global warming and the depletion of fossil resources. The emerging field of perovskite solar cells (3rd generation photovoltaic) is very attractive because it uses abundant and easy-processing materials (low-cost technology) and provides competitive efficiencies.Still, efforts remain to be performed to develop this technology, especially concerning the improvement of efficient and reliable charge transporting electrodes. Titanium dioxide layer, commonly used for electron extraction, presents defects that limit the performance and lifetime of the perovskite solar cells.This work proposes the use of materials based on TiO₂ and carbon nanostructures to improve the electron transport and collection within the solar cells, in order to enhance the power conversion efficiency. The singular technique of laser pyrolysis, which is a continuous process of nanoparticles synthesis, was adapted to produce TiO₂/graphene nanocomposites with well-controlled properties. These materials have been characterized and integrated into perovskite solar cells that demonstrate an improved efficiency in presence of graphene.Besides, this work presents an innovating architecture based on vertically aligned carbon nanotubes for the electron collection of a perovskite solar cell. We show then the strong potential of carbon materials for optoelectronic, especially 3rd generation photovoltaic
Do, Isabelle. « Nanocomposites nanotubes de carbone/élastomère : Propriétés rhéologiques et électriques ». Pau, 2007. http://www.theses.fr/2007PAUU3005.
Texte intégralSince carbon nanotubes (CNT) tend to remain as entangled agglomerates, homogeneous dispersed states within a polymer is not easily obtained, which reduces the interest of nanotubes as reinforcements. Many of the solutions proposed to address this issue rely on the modification of the interface between carbon nanotubes and the polymer matrix. The aim of the study is to establish the relationship between the nature of the CNT/polymethylacrylate (PMA) interface and the spatial organization of the CNTs in the matrix, on the one hand, and rheological and electrical properties of the nanocomposites, on the other hand. The interface is controlled by using polyacrylic acid (PAA), either by grafting it on the nanotubes surface, or by using it as a surfactant. The study of the morphology of the composites by electronic microscopy showed the importance of distinguishing the distribution of CNTs in the matrix (i. E. The repartition of the nanotubes clusters in the whole sample), from their dispersion (i. E. Their individualization within the clusters). This distinction is central as it allows explaining the physical properties of the nanocomposites. The studies of the linear viscoelastic and electrical properties of the composites highlighted the existence of percolation phenomena. We also showed that the electrical properties of the composites are sensitive to the CNTs dispersion, whereas the rheological ones are sensitive to the quality of distribution. The use of PAA, either grafted or adsorbed on nanotubes, allows an increase in electrical conductivity as well as a better dispersion of the nanotubes, thus lowering the electrical percolation thresholds
Mayne-L'Hermite, Martine. « Elaboration, microstructure et comportement au fluage de nanocomposites Si3N4/SiC ». Limoges, 1997. http://www.theses.fr/1997LIMO0021.
Texte intégralHoang, Minh Tuan. « Modélisation et simulation multi échelle des effets de taille et des couplages électromécaniques dans les nanostructures ». Thesis, Paris Est, 2014. http://www.theses.fr/2014PEST1074/document.
Texte intégralNanostructures, and more specifically semiconductor nanowires, have drawn special attention in recent years for many applications such as energy harvesting systems or sensors of very high precision. Many recent experiments and theoretical ab-initio calculations have evidenced size effects, which can significantly modify the electromechanical properties of nanowires for diameters below 10 nm. The objective of this thesis is to provide multi-scale modeling of electromechanical properties of nanostructures, such as ionic nanowires and laminated nanocomposites, to reproduce the size effects associated with nanoscale in a continuum model, based on ab-initio calculations to identify and validate the models. In a first part, the surface effects in isolated homogeneous piezoelectric nanowires are modeled. A multi-scale approach is developed, including continuous nanowires modeling taking into account an additional surface energy in the piezoelectric laminates where the associated parameters are identified by ab-initio calculations. For this, a procedure based on slabs is developed, allowing through first-principles calculations on successive slabs thicknesses to isolate the surface energy and to deduce the surface elastic and piezoelectric coefficients. The equations of the continuous model are then solved by a finite element method including appropriate surface elements. The continuous multi-scale model is compared with ab-initio calculations involving full atomistic models of nanowires with different diameters (from 0.6 to 3.9 nm) to validate model regarding size effects of electromechanical properties. In the second part, multi-scale models are constructed to describe the size effects for heterogeneous nanostructures. These structures include coated nanowires or laminated nanocomposites. For nanowires with radial heterogeneity, the previously developed approach is extended to the case of coated surfaces, and involves a continuous surface energy incorporating the effects of the coating. For laminated AlN/GaN nanocomposites, size effects observed by ab-initio calculations are caused by the presence of the interfaces and induce size-dependent elastic properties with respect to the layer thickness. A continuum model based on an imperfect interface is proposed to describe the size dependent effective elastic properties of the overall composite, which are identified by ab-initio calculations. In the last part, nanogenerators system based on nanowires are modeled, involving nanowires arrays aligned in polymer substrates with graphene electrode. The previously developed finite element models are used to simulate the electromechanical properties of such systems
Habis, Christelle. « Development of ZnO-FTO nanocomposites for the use in transparent conductive thin films ». Electronic Thesis or Diss., Université de Lorraine, 2022. http://www.theses.fr/2022LORR0192.
Texte intégralMy thesis work entitled “Development of ZnO-FTO nanocomposites for the use in transparent conductive thin films” is supervised by Professor Michel Aillerie at University of Lorraine. This work was mainly made at the “Laboratoire des Matériaux Optiques, Photoniques et Systèmes” LMOPS in Centrale Supélec, Metz. Although this work forms a whole in the elaboration of transparent conductive oxides, it is divided into two parts. The first part consists on identifying the properties of bulk materials (ZnO and FTO) deposited in the form of thin film. Whereas, the second part is about the elaboration and characterization of Zinc Oxide (ZnO) and Aluminum doped Zinc Oxide (AZO) nanofibers, then associated to FTO thin films to form nanocomposite. The main objective of this work is to make flexible electrodes using low cost and abundant material, but also improving the optical properties and more specifically the haze factor of the nanocomposite layers.Transparent conductive oxides (TCOs) are technologically significant class of materials extensively used in thin film solar cells due to their ability to transmit light and collect charge carriers. In addition to the fundamental qualities of transparency and conductivity, the TCOs are frequently desired to have a certain degree of surface roughness (i.e., texture) in order to effectively scatter transmitted light into the active materials, therefore lengthen the optical path and, as a result, enhance the performance of the cell and light absorption. This thesis focuses on the development of low-cost fabrication techniques for transparent oxide layers using non-polluting materials to enable the functionalization of operational devices with high efficiency for renewable energy production. The choice was made to study tin-based TCO layers doped with fluorine, F:SnO2, known as FTOs for "Fluor Tin Oxides". FTOs are wide band gap oxides, like ZnO, TiO2, Al2O3, pure or doped. In principle, these layers have a high scattering factor, as defined above, in order to improve the optical path and absorption. In addition, the optical texture of TCOs can be easily controlled by depositing suspensions of nanostructures before the film deposition. Generally, these nanostructures are nanoparticles or even carbon nanowires or metallic nanowires (silver, copper, ...) and more recently nanowires of TiO2 (presenting the disadvantage of the titanium element) or of undoped ZnO which unfortunately decrease the conductivity due to the increase of the interface resistance with the concentration of the nanoparticles.Therefore, we propose the study of FTO thin films, pure and also in the presence of ZnO and AZO nanofibers by electrospinning from a PVA-based solution in order to have a nanostructured layer with improved transparency and electrical conductivity properties to be integrated as transparent electrodes in photovoltaic cells, meeting the performance criteria defined above. With the characterization techniques available in the LMOPS laboratory and the University of Lorraine (SEM, Raman, EDX, DRX, UV-vis Spectro, ATG, AFM, profilometer) the growth will be followed by morphological and structural studies of the layers. Finally, electrical and optical properties, in particular absorption and scattering factor, will also be extensively investigated on selected layers with the best structural and morphological properties and the minimum of interface defects when deposited on a PV structure
Zaitsev, Andrii. « Exploration de la voie plasma pour la synthèse de nanostructures et de nanocomposites à base de polyaniline ». Thesis, Le Mans, 2015. http://www.theses.fr/2015LEMA1014/document.
Texte intégralPolymer nanostructures are of great interest due to their unique properties such as high shape factor. This property is essential for applications where surface interactions are involved. One example of such an application is the gas detection. Polyaniline (PANi) has been shown as a promising material for ammonia detection. Conventional synthesis (chemical orelectrochemical) of PANi nanofibers has been widely described in the literature but this way has many drawbacks. They include several steps (synthesis, purification, deposition on the substrate) and the use of chemicals (oxidants, acids) which are not environmentally friendly. The polymerization assisted by cold plasma (PECVD) allows overcoming it, as only themonomer is used and is directly polymerized on the substrate. This thesis work aims to develop plasma polyanilinenanostructures while retaining the monomer unit in the polymer. The key parameter that determines thenanostructuring process is the discharge power. At high power, highly structured films are obtained but the monomer molecules are totally fragmented. On the contrary, low power allows conservation of the monomer unit but no surface structuring is observed. We developed a method which combines the advantages of each regime. This "bottom-up" process consists to vary the input power during deposition in two or three stages. Parameters influencing the chemical and morphological structures are determined and the two and three steps methods are compared. Furthermore, the "top-down" synthesis of nanostructures by etching the PANi layer is also studied according to the plasma parameters (power and discharge time, etching gas flow rate and substrate bias). Finally, in plasma phase, we synthesized nanocomposite by combining PANi nanostructures and sputtered Pd particles. The chemical structure of the PANi films is characterized by UV-Vis spectroscopy, FT-IR and XPS. In order to highlight the nanostructuring of thin films, SEM and AFM microscopy areused. The latter one allows also the calculation of the roughness and specific surface of the PANi. EDX spectroscopyis used to bring out the presence of palladium and to quantify it. Finally, the obtained layers are characterized under gas byabsorbance variation measurements in order to determine their sensitivity and response time to ammonia
Dubois, Jean-Baptiste. « Conducteurs nanocomposites métalliques élaborés par déformation plastique sévère : formation et stabilité thermo-mécanique des nanostructures, propriétés induites ». Poitiers, 2010. http://theses.univ-poitiers.fr/26782/2010-Dubois-Jean-Baptiste-These.pdf.
Texte intégralThis thesis concerns the study of metallic nanocomposite copper/niobium (Cu/Nb) wires, combining high electrical conductivity and high strength, as required for the design of high magnetic field resistive coils. The reinforced continuous nanocomposite Cu/Nb conductors are fabricated via a severe plastic deformation process (SPD), which consists in repeated extrusion, drawing and bundling cycles (Accumulative Drawing and Bundling : ADB) and leads to the nanostructuration of the Nb reinforcements and a multi-scale Cu matrix. In order to optimize the process, the effect of heat treatments on texture and its development during the process were analysed by means of laboratory X-ray diffraction. Complementary in-situ heat treatments under synchrotron radiation gave a better insight into the elementary annealing mechanisms and enabled defining optimized heat treatments. These experiments also revealed that the thermal stability of Cu/Nb conductors is extremely dependent of the microstructure size: recovery, recrystallization, grain growth and all relaxation processes are frustrated in the case of nanocomposites. From these results, optimized “co-axial” conductors reinforced by Nb nanofilaments and nanotubes were processed. Their microstructure and physical properties have been characterized and compared to those of previous Cu/Nb nanocomposite conductors. With the possibility to produce long wires with improved properties, these new Cu/Nb nanocomposites offer a great alternative to existing conductors for future high magnetic field applications
Aldroe, Hanaya. « Analyse des propriétés physiques et mécaniques des nanocomposites polyamide 12 / cloisite® 30B en lien avec leurs nanostructures ». Thesis, Tours, 2014. http://www.theses.fr/2014TOUR4034/document.
Texte intégralNanocomposites are interestingly growing since their development in the 1990s by Toyota Company. Therefore, improving the properties of such materials is a major issue from fundamental and industrial point of view. This improvement can pass through a relevant choice of reinforcing loads added to the matrix particularly regarding the type, geometry, the proportion, and the treatment of these fillers. The processing parameters of the mixture play also a key role. The objective of this work is to contribute to the identification and understanding of the mechanisms at the origin of the reinforcing thermoplastic matrices by nanofillers. This aspect presented through the study of the thermal and mechanical properties of nanocomposites formed by a polyamide 12 matrix (PA12) filled with organically modified clay nanoparticles. More specifically, we analysed the effects of the filler mass fraction and environmental aging on structural, thermal and mechanical properties of these nanocomposites. The mixing conditions on these properties were also examined. A particular attention has been paid to the study of relationships between the macroscopic properties and the structure of nanocomposites. Viscoelastic properties of these materials in both melt and solid states were compared, which represents one of the originalities of this work
Laurent, Christophe. « Contribution à l'étude de nanocomposites à matrice céramique. Alumine-alliages fer-chrome et alumine-zircone-fer et alliages fer-chrome ». Toulouse 3, 1994. http://www.theses.fr/1994TOU30017.
Texte intégralSauvage, Xavier. « Transformations de phases induites par déformation plastique intense. Cas des aciers perlitiques tréfilés et des nanocomposites filamentaires Cu/Nb ». Rouen, 2001. http://www.theses.fr/2001ROUES032.
Texte intégralLivres sur le sujet "Nanostructures et nanocomposites"
author, Thomas Sabu, MirMahaleh Moein MehdiPour author, Rafiei Saeedeh author, Maghsoodlou Shima author et Afzali Arezo author, dir. Foundations of nanotechnology. Oakville, ON, Canada : Apple Academic Press Inc., 2014.
Trouver le texte intégralJoshi, Mangala. Nanotechnology in Textiles : Advances and Developments in Polymer Nanocomposites. Jenny Stanford Publishing, 2020.
Trouver le texte intégralJoshi, Mangala. Nanotechnology in Textiles : Advances and Developments in Polymer Nanocomposites. Jenny Stanford Publishing, 2020.
Trouver le texte intégralJoshi, Mangala. Nanotechnology in Textiles : Advances and Developments in Polymer Nanocomposites. Jenny Stanford Publishing, 2020.
Trouver le texte intégralJoshi, Mangala. Nanotechnology in Textiles : Advances and Developments in Polymer Nanocomposites. Jenny Stanford Publishing, 2020.
Trouver le texte intégralJoshi, Mangala. Nanotechnology in Textiles : Advances and Developments in Polymer Nanocomposites. Jenny Stanford Publishing, 2020.
Trouver le texte intégralChapitres de livres sur le sujet "Nanostructures et nanocomposites"
Hashem Abdelmohsen, Ahmed, Sherif A. El-Khodary et Nahla Ismail. « Theories, Hypothesis and Rules for Morphology Transition Engineering of 1D, 2D and 3D Nanomaterials ». Dans Nanotechnology and Nanomaterials. IntechOpen, 2023. http://dx.doi.org/10.5772/intechopen.112135.
Texte intégralActes de conférences sur le sujet "Nanostructures et nanocomposites"
Aboul-Gheit, Ahmed K., Sawsan A. Mahmoud et Yasser M. Moustafa. « Nanostructured Ti-Fe Thin Layered Photocatalyst via Sol-Gel Technique ». Dans ASME 2008 2nd Multifunctional Nanocomposites and Nanomaterials International Conference. ASMEDC, 2008. http://dx.doi.org/10.1115/mn2008-47033.
Texte intégralVodopyanov, Alexander, Andrey Samokhin, Nikolay Aleksev, Mikhail Sinayskiy, Andrey Sorokin et Sergey Sintsov. « TUNGSTEN CARBIDE NANOPOWDER SYNTHESIS UNDER THE EXPOSURE OF 24 GHZ GYROTRON RADIATION ON THE NANOCOMPOSITE OF THE W-C SYSTEM OBTAINED IN A THERMAL PLASMA ». Dans Ampere 2019. Valencia : Universitat Politècnica de València, 2019. http://dx.doi.org/10.4995/ampere2019.2019.9836.
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