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Artykuły w czasopismach na temat "Composite metal nanoparticles"
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Wang, Ji Fen, Hua Qing Xie, Zhong Xin, Yang Li i Jing Li. "Thermal Properties of Composites Containing Metal Oxide Nanoparticles". Materials Science Forum 694 (lipiec 2011): 146–49. http://dx.doi.org/10.4028/www.scientific.net/msf.694.146.
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We prepared a series of paraffin wax (PW) based phase change composite containing ZnO, Al2O3 and Fe2O3 nanoparticles, respectively. DSC results showed that there is a decrease trend in phase change latent heat capacity (Ls) with an increase of metal oxide nanoparticle loadings. ZnO/PW has higher Ls than those of Fe2O3/PW and Al2O3/PW with same metal oxide nanoparticle loadings. Transient short-hot-wire (SHW) method was used to measure thermal conductivity of these composites. The results showed that nanoparticle addition leads to substantial enhancement in the thermal conductivity of the composites. The highest thermal conductivity of the measured composites is about 0.27 W/(m•K) of Fe2O3/PW with 3.0 wt% nanoparticles and Al2O3/PW with 5.0 wt% nanoparticles at 15 oC, which higher than that of PW by about 30%. The lowest thermal conductivity of composites is that of Al2O3/PW and ZnO/PW with 1.0 wt% nanoparticles at 60 oC, which higher than that of PW by about 7%.
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Atisme, Yu, Tseng, Chen, Hsu i Chen. "Interface Interactions in Conjugated Polymer Composite with Metal Oxide Nanoparticles". Nanomaterials 9, nr 11 (29.10.2019): 1534. http://dx.doi.org/10.3390/nano9111534.
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This study presents the preparation, characterization, and properties of a new composite containing cerium oxide nanoparticles and a conjugated polymer. CeO2 nanoparticles prepared using the co-precipitation method were dispersed into the conjugated polymer, prepared using the palladium-catalyzed Suzuki–Miyaura cross-coupling reaction. The interface interactions between the two components and the resultant optoelectronic properties of the composite are demonstrated. According to transmission electron microscopy and X-ray absorption spectroscopy, the dispersion of CeO2 nanoparticles in the polymer matrix strongly depends on the CeO2 nanoparticle concentration and results in different degrees of charge transfer. The photo-induced charge transfer and recombination processes were studied using steady-state optical spectroscopy, which shows a significant fluorescence quenching and red shifting in the composite. The higher photo-activity of the composite as compared to the single components was observed and explained. Unexpected room temperature ferromagnetism was observed in both components and all composites, of which the origin was attributed to the topology and defects.
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Rahman, Mohammad Mizanur. "Polyurethane/Zinc Oxide (PU/ZnO) Composite—Synthesis, Protective Property and Application". Polymers 12, nr 7 (11.07.2020): 1535. http://dx.doi.org/10.3390/polym12071535.
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A polyurethane (PU) is a multifunctional polymer prepared by using more than two types of monomers. The unique properties of PU come from monomers, thus broadening the applicability of PU in many different sectors. The properties can be further improved by using many nanoparticles. Different metal oxides as nanoparticles are also widely used in PU materials. ZnO is a widely used inorganic metal oxide nanoparticle for improving polymer properties. In this review article, the techniques to prepare a PU/ZnO composite are reviewed; the key protective properties, such as adhesive strength and self-healing, and applications of PU/ZnO composites are also highlighted. This review also highlights the PU/ZnO composite’s current challenges and future prospects, which will help to broaden the composite practical application by preparing environmentally friendly composites.
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Busko, T. O. "Electron structure of TiO 2 composite films with noble metal nanoparticles". Semiconductor Physics Quantum Electronics and Optoelectronics 17, nr 1 (31.03.2014): 67–74. http://dx.doi.org/10.15407/spqeo17.01.067.
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Zhang, Junyu, i Zhao Wang. "Nanoparticle–Hydrogel Based Sensors: Synthesis and Applications". Catalysts 12, nr 10 (22.09.2022): 1096. http://dx.doi.org/10.3390/catal12101096.
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Hydrogels are hydrophilic three-dimensional (3D) porous polymer networks that can easily stabilize various nanoparticles. Loading noble metal nanoparticles into a 3D network of hydrogels can enhance the synergy of the components. It can also be modified to prepare intelligent materials that can recognize external stimuli. The combination of noble metal nanoparticles and hydrogels to produce modified or new composite materials has attracted considerable attention as to the use of these materials in sensors. However, there is limited review literature on nanoparticle–hydrogel-based sensors. This paper presents the detailed strategies of synthesis and design of the composites, and the latest applications of nanoparticle–hydrogel materials in the sensing field. Finally, the current challenges and future development directions of nanoparticle–hydrogel-based sensors are proposed.
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Li, Zhe Fei, Jian Xie, Lia Stanciu i Yang Ren. "Nanostructured Graphenes and Metal Oxides for Fuel Cell and Battery Applications". Advanced Materials Research 705 (czerwiec 2013): 126–31. http://dx.doi.org/10.4028/www.scientific.net/amr.705.126.
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Graphene/spacer nanoparticle composites were prepared by reducing graphene oxide with hydrazine in the presence of different contents of polyaniline nanoparticles. In-situ cryo-TEM image of GO-spacer solution shows that spacer nanoparticles are anchored on GO sheets. During the reduction, as-adsorbed spacer nanoparticles were sandwiched between layers of graphene. These spacer nanoparticles act as spacers to create gaps between neighboring graphene sheets, resulting in higher surface area. Graphene/spacer nanocomposites exhibited highest specific surface area of 1500 m2/g. Utilizing this composite material, a supercapacitor with specific capacitance of 267 F/g at a current density of 0.1 A/g was achieved.
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Kang, Sang Wook. "Long-Term Stable 1-butyl-3-methylimidazolium Hexafluorophosphate/Ag Metal Composite Membranes for Facilitated Olefin Transport". Membranes 10, nr 8 (18.08.2020): 191. http://dx.doi.org/10.3390/membranes10080191.
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For the preparation of long-term stable ionic liquid/Ag nanoparticles composites, we compared the separation performance of 1-butyl-3-methylimidazolium tetrafluoroborate (BMIM+BF4−)/Ag, and 1-butyl-3-methylimidazolium hexafluorophosphate (BMIM+PF6−)/Ag composite membranes with time. Separation performance showed that the BMIM+PF6−/Ag metal composite membrane was more stable than the BMIM+BF4−/Ag metal composite membrane for more than 160 h. These differences in long-term stability in BMIM+PF6−/Ag and BMIM+BF4−/Ag metal composite membranes was attributable to the phase separation between ionic liquid and nanoparticles. In particular, the phase separation between ionic liquid and silver nanoparticles was not observed with time in hydrophobic ionic liquid BMIM+PF6−, confirmed by X-ray photoelectron spectroscopy.
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Malaki, Massoud, Wenwu Xu, Ashish Kasar, Pradeep Menezes, Hajo Dieringa, Rajender Varma i Manoj Gupta. "Advanced Metal Matrix Nanocomposites". Metals 9, nr 3 (15.03.2019): 330. http://dx.doi.org/10.3390/met9030330.
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Lightweight high-strength metal matrix nano-composites (MMNCs) can be used in a wide variety of applications, e.g., aerospace, automotive, and biomedical engineering, owing to their sustainability, increased specific strength/stiffness, enhanced elevated temperature strength, improved wear, or corrosion resistance. A metallic matrix, commonly comprising of light aluminum or magnesium alloys, can be significantly strengthened even by very low weight fractions (~1 wt%) of well-dispersed nanoparticles. This review discusses the recent advancements in the fabrication of metal matrix nanocomposites starting with manufacturing routes and different nanoparticles, intricacies of the underlying physics, and the mechanisms of particle dispersion in a particle-metal composite system. Thereafter, the microstructural influences of the nanoparticles on the composite system are outlined and the theory of the strengthening mechanisms is also explained. Finally, microstructural, mechanical, and tribological properties of the selected MMNCs are discussed as well.
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Basak, A. K., A. Pramanik i M. N. Islam. "Failure Mechanisms of Nanoparticle Reinforced Metal Matrix Composite". Advanced Materials Research 774-776 (wrzesień 2013): 548–51. http://dx.doi.org/10.4028/www.scientific.net/amr.774-776.548.
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The quest for the advanced functional material of superior functionality for advanced structure is being driven in various fronts of engineering materials. One of such front is metal matrix composite (MMC) which has already been proven as one of the most productive field in that respect. With the advance of technology, now it is possible to reinforce the MMCs with nanosized particles compared to conventional micron-sized ones. However, the addition of nanoparticle in the MMC to improve its mechanical properties is not unconditional. To achieve positive gain by adding nanoparticles in the MMCs, all the influencing factors should be taken into consideration. The present paper reviews the failure mechanisms of nanoparticles reinforced MMCs in light of its strengthening mechanisms.
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Yatsyshen, Valeriy, Irina Potapova i Vyacheslav Shipaev. "Polaritons in Nanocomposites of Metal Nanoparticles – Dielectric". NBI Technologies, nr 2 (październik 2019): 39–53. http://dx.doi.org/10.15688/nbit.jvolsu.2019.2.7.
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The article studies the main characteristics of surface polaritons in composite nanomaterials. The authors consider composite media such as noble metal nanoparticles randomly distributed in a transparent dielectric matrix and build dispersion curves of polaritons in such nanocomposites. The paper shows calculating optical parameters of the surface polariton for several values of the radius of metal nanoparticles and the nanocomposite filling parameter. The authors also present the calculations of the complex refractive index for polaritons in composites with nanoparticles of different metals. In addition, the authors find the dependences of the real and imaginary parts of the complex refractive index of the nanocomposite on the normalized frequency for membranes with different thicknesses and calculate real and imaginary parts of dielectric constant for waves in several metals. Besides, the article provides an overview of important stages in the study of surface electromagnetic waves. It shows that the variation of the structure materials, size and concentration of nanoparticles opens wide possibilities for controlling the optical properties of composite mediums and their practical application. The considered nanocomposites are artificially created media whose material parameters can be controlled. The first method consists in changing the relative volume of the nanoparticles filling of the dielectric matrix. The second method consists in changing the dielectric constant of the nanocomposite matrix. The authors emphasize that the dielectric constant of the nanocomposite in this case acquires resonant properties in contrast to the permeability of the nanoparticles themselves.
Rozprawy doktorskie na temat "Composite metal nanoparticles"
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Strossi, Pedrolo Débora Regina. "Synthesis of metal-zeolite composite materials for bifunctional catalytic reactions". Thesis, Université de Lille (2018-2021), 2021. https://pepite-depot.univ-lille.fr/LIBRE/EDSMRE/2021/2021LILUR065.pdf.
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Les catalyseurs à base de zéolite ont été largement utilisés dans la conversion de la biomasse. Les rendements catalytiques des produits recherchés sont fortement limités en raison de la taille relativement petite des pores dans les zéolithes et la préparation du catalyseur par imprégnation conduit généralement à des nanoparticules métalliques relativement grosses et à un faible contact entre les sites métalliques et acides. Le but de ce travail est la conception de catalyseurs nanocomposites métal-zéolithe contenant des nanoparticules de ruthénium uniformément réparties dans les zéolithes hiérarchiques BEA et ZSM-5. L'utilisation de ruthénium évite la formation de silicates et d'aluminates métalliques inertes difficilement réductibles, tandis que les nanotubes de carbone avec des nanoparticules d'oxyde métallique supportées jouent un rôle de gabarit sacrificiel, ce qui permet de créer une mésoporosité et d'apporter une fonctionnalité métallique à l'intérieur de la matrice zéolithique. Par rapport aux catalyseurs métalliques supportés par des zéolites classiques, les zéolites ruthénium hiérarchiques synthétisées présentaient une activité beaucoup plus élevée et une sélectivité en méthane plus faible dans la synthèse Fischer-Tropsch. La caractérisation des catalyseurs préparés a indiqué l'initiation de la cristallisation des zéolites sur des nanoparticules métalliques. Cet effet a en outre été utilisé pour augmenter la dispersion de nanoparticules métalliques par cristallisation secondaire de Ru supporté sur ZSM-5. Nos résultats montrent une redispersion significative des nanoparticules d'oxyde métallique incorporées et une augmentation de l'activité des réactions modèles. De plus, une stratégie de synthèse a été développée pour la préparation de catalyseurs nanocomposites métalliques et zéolithiques hiérarchiques pour la synthèse directe d'iso-paraffines à partir de gaz de synthèse. Les nanocomposites sont synthétisés en trois étapes. Dans la première étape, la zéolite mère (noyau) est gravée avec une solution de fluorure d'ammonium. La gravure crée de petits mésopores à l'intérieur des cristaux de zéolite. Dans la deuxième étape, les nanoparticules de Ru préparées à l'aide de microémulsion eau-dans-huile sont déposées dans les mésopores de la zéolithe. Dans la troisième étape, une enveloppe de zéolite de zéolites de type MFI (silicalite-1 ou ZSM-5) est cultivée sur les cristaux de zéolite parent recouvrant à la fois la surface gravée et les nanoparticules métalliques. Ainsi, les nanoparticules métalliques deviennent entièrement encapsulées à l'intérieur de la matrice zéolithique. Les paramètres les plus importants tels que la teneur en ruthénium, la mésoporosité de la zéolite, et plus particulièrement, l'acidité de l'enveloppe du catalyseur, qui affectent les performances catalytiques des matériaux nanocomposites synthétisés dans la synthèse Fischer-Tropsch à basse température ont été identifiés dans ce travail. La quantité relative plus élevée d'iso-paraffines a été observée sur les catalyseurs contenant une enveloppe de ZSM-5. La proximité entre les sites métalliques et acides dans l'enveloppe zéolithique des catalyseurs nanocomposites est un paramètre crucial pour la conception de catalyseurs bifonctionnels zéolithiques métalliques efficaces pour la synthèse sélective de carburants de type essence via la synthèse Fischer-Tropsch, tandis que l'acidité du cœur du catalyseur a qu'un impact limité sur les performances catalytiquesZeolite-based catalysts have been widely used in the conversion of biomass. The catalytic yields of the desired products are strongly limited due to the relatively small size of the pores in zeolites and the catalyst preparation by impregnation usually leads to relatively large metal nanoparticles and low contact between metal and acid sites. The purpose of this work is the design of metal-zeolite nanocomposite catalysts containing ruthenium nanoparticles uniformly distributed in the hierarchical BEA and ZSM-5 zeolites. Use of ruthenium avoids formation of inert hardly reducible inert metal silicates and metal aluminates, while carbon nanotubes with supported metal oxide nanoparticles play a role of sacrificial template, which allows creating mesoporosity and bringing metallic functionality inside the zeolite matrix. Compared to the conventional zeolite supported metal catalysts the synthesized hierarchical ruthenium-zeolites exhibited much higher activity and lower methane selectivity in Fischer-Tropsch synthesis. Characterization of the prepared catalysts has indicated initiation of crystallization of zeolites over metal nanoparticles. This effect has been further used to increase the dispersion of metal nanoparticles by secondary crystallization of Ru supported over ZSM-5. Our results show significant re-dispersion of embedded metal oxide nanoparticles and increase in the activity of model reactions. In addition, a synthetic strategy was developed for the preparation of hierarchical metal and zeolite nanocomposite catalysts for direct synthesis of iso-paraffins from syngas. The nanocomposites are synthesized in three steps. In the first step, the parent (core) zeolite is etched with an ammonium fluoride solution. The etching creates small mesopores inside the zeolite crystals. In the second step, the Ru nanoparticles prepared using water-in-oil microemulsion are deposited in the mesopores of the zeolite. In the third step, a zeolite shell of MFI-type zeolites (silicalite-1 or ZSM-5) is grown on the parent zeolite crystals coating both the etched surface and metallic nanoparticles. Thus, the metal nanoparticles become entirely encapsulated inside the zeolite matrix. Most important parameters such as ruthenium content, zeolite mesoporosity, and more particularly, the acidity of the catalyst shell, which affect the catalytic performance of the synthesized nanocomposite materials in low-temperature Fischer−Tropsch synthesis were identified in this work. The higher relative amount of iso-paraffins was observed on the catalysts containing a shell of ZSM-5. The proximity between metal and acid sites in the zeolite shell of the nanocomposite catalysts is a crucial parameter for the design of efficient metal zeolite bifunctional catalysts for selective synthesis of gasoline-type fuels via Fischer−Tropsch synthesis, while the acidity of the catalyst core has only a limited impact on the catalytic performance
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Jonke, Alex P. "Atomic metal/polyaniline composites". Diss., Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/49070.
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It is ideal to theoretically predict the activity of a catalyst. It has been recognized that not only the type of metal, but also its atomic size plays an important role in catalysis. In the past, atomic clusters have been created by sputtering from a sacrificial metal plate and then using a mass selector to choose cluster sizes from 1-233 atoms of gold. This approach has practical limitations. In this thesis, I describe a procedure by which atomic clusters of gold containing 1-8 atoms are deposited in polyaniline as an isolation matrix. My atomic deposition follows a cyclic pathway. Atomic clusters of palladium and atomic alloys of gold and palladium are also deposited in polyaniline using the same process. It is to show that this method will also work for other metals. These composite materials are characterized, and the catalytic activity for alcohol oxidation is evaluated.
This thesis is divided into seven chapters. The first chapter discusses the chemistry of polyaniline for using gold and palladium as catalysts. The technique developed to deposit the atomic clusters is discussed in the second chapter. This technique deposits one atom of metal per imine site on polyaniline, per cycle. The cycle is repeated n-times until a cluster of specified size, Mn, and composition has been synthesized. It is known that polyaniline plays an important role in stabilization of the formed clusters which prevents their aggregation. The optimization of this technique is the topic of the third chapter along with the description of how these composite films are produced. To end this chapter, the composite films are characterized by cyclic voltammetry, Kelvin probe, and X-ray photoelectron spectroscopy.
In chapters 4 and 5, the catalytic activity of the polyaniline/gold composites for the oxidation of alcohols in alkaline media using cyclic voltammetry is evaluated. In chapter 4, the correlation of the electrochemical activity for the oxidation of n-PrOH with the odd-even pattern from the calculated HOMO-LUMO gap energies for the same size clusters is shown. It is shown that the infrared spectrum of polyaniline with different sizes of atomic gold clusters also follows the odd-even pattern. Chapter 5 expands on the discussion of the catalytic oxidation of alcohols. The oxidation of methanol, ethanol, propanol, and butanol is surveyed. The peak currents are again dominated by the odd-even pattern.
In chapter 6, the versatility of the atomic deposition cycle is shown by depositing atomic palladium clusters. The peak currents for the oxidation of n-PrOH by these palladium composite films again follows the predicted pattern of the calculated HOMO-LUMO gap energies for atomic palladium clusters. This chapter also explores bimetallic atomic clusters of gold and palladium. The results indicate that the catalytic activity depends on the orientation of the cluster in the polyaniline matrix. Chapter 7 discusses the oxidation of methanol, ethanol, and isopropanol on AunPd1 bimetallic atomic clusters. The addition of palladium in the cluster increases the peak current densities for the oxidation of both alcohols except for the most stable of the atomic gold clusters, while it inactivated the electrodes for isopropanol. The possible future work for this project is discussed in chapter 8.
Overall, this thesis has developed a novel and unique technique for depositing atomic metal clusters into a polyaniline matrix. The technique is versatile enough to deposit atomic metal clusters other than gold, as shown by creating atomic palladium clusters and atomic bimetallic clusters of gold and palladium. This is extremely useful, since this single technique can produce many different types of atomic catalysts. The composite materials have been shown to be catalytically active for the oxidation of alcohols in alkaline media. This indicates a significant improvement to conserve precious metals while still retaining a high catalytic activity.
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Anyaogu, Kelechi C. "Stabilized metal nanoparticle-polymer composites preparation, characterization and potential applications /". Bowling Green, Ohio : Bowling Green State University, 2008. http://rave.ohiolink.edu/etdc/view?acc%5Fnum=bgsu1222126708.
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Navas, M. P. "Pulsed laser ablation of composite metal nanoparticles: studies on growth, plasmonic sensing and catalysis". Thesis, IIT Delhi, 2017. http://localhost:8080/iit/handle/2074/7229.
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Hardian, Rifan. "Interplay between structure, texture, and reactivity in MOFs in the case of amorphous, defective, and composite materials". Thesis, Aix-Marseille, 2018. http://www.theses.fr/2018AIXM0419/document.
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Metal-Organic Frameworks (MOFs) sont constitués de clusters métalliques connectés dans les ligands organiques. L'objectif principal de ma thèse était de caractériser la texture, la structure et la réactivité des MOFs dans le cas de systèmes présentant des défauts, amorphes et composites.La première étude est centrée sur les propriétés de la famille Fe-BTC et ce travail a été réalisé en collaboration avec l'Université d'Utrecht et l'Université d'Oxford. Une étude comparative entre le MIL-100(Fe) et son homologue commercial Basolite F300 (BASF) qui est amorphe ont été évaluées par l’adsorption de méthanol et d'autres techniques de caractérisation. De plus, les deux matériaux ont été testés pour être utilisés comme support pour l'imprégnation des métaux.Dans la deuxième étude, le broyage à la bille est utilisé comme stratégie de modification post-synthèse de MOFs. Le matériau ZIF-8 a été sélectionné de cas car il s'agit d'un MOF disponible dans le commerce (Basolite Z1200) et qui est en train de devenir de référence dans ce domaine. Ce chapitre examiner des propriétés flexibles, de la texture, de la structure, et la réactivité.Les MOFs UiO-66 et MOF-808 sont également analysées. Ces études ont été réalisées en collaboration avec l'Université Technique de Munich. UiO-66 contenant différents défauts d'ingénierie sont examinées. Nous avons démontré que les mesures d’adsorption de vapeur peuvent être un outil précieux pour accéder à la chimie des défauts. Le deuxième système est la série MOF-808 qu’une étude complète est présentée allant des diverses stratégies de synthèse de MOFs défectueux et composites jusqu'à leur propriété d'adsorption et de réactivitéMetal-organic frameworks (MOFs) are a class of porous materials that constructed from metal clusters connected with organic linkers. The main objective of my PhD was to characterize the texture, structure, and reactivity of MOFs materials with a particular focus on defective, amorphous and composite materials. The first study is centered on the properties of the Fe-BTC family and this work was realized in collaboration with Utrecht University and the University of Oxford. A comparative study between crystalline MIL-100(Fe) and its commercial counterpart amorphous Basolite F300 (BASF) were studied by using methanol adsorption to predict the reactivity. Other characterization methods are introduced to investigate both materials which were further tested to be used as supports for metal-impregnation. In the next study, ball-milling was employed as a post-synthesis strategy for MOF modification. This ZIF-8 material was selected since it is commercially available (Basolite Z1200) and is becoming one of the reference materials in this area. Extensive studies including flexibility, textural, structural, as well as reactivity of different milling products is presented. Zirconium-based MOFs (UiO-66 and MOF-808) were also examined in this thesis. These studies were performed in collaboration with TU Munich. UiO-66 series containing engineered defects are first examined. We demonstrated that vapor adsorption measurement is a valuable tool to access the chemistry of the defects. The second studied system is MOF-808 series, where a comprehensive study is presented starting from synthesis strategies of defective and composite MOFs up to adsorption properties and reactivity
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Samer, Nassim. "Synthèse réactive de Composites à Matrice Métallique". Thesis, Lyon, 2016. http://www.theses.fr/2016LYSE1057/document.
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En raison de leur propriétés spécifiques élevées, par rapports aux alliages légers, les Composites à matrice métallique (CMM) représentent des matériaux d'intérêt pour des applications de haute technologie dans les domaines aéronautique et aérospatiale. Les CMM les plus couramment utilisés sont à renfort particulaire, ou PRMMC, et à matrice Al en raison de leur faible densité. Cette thèse porte sur la mise au point de PRMMC à renfort nanométrique par une voie de synthèse réactive globale. En raison des normes encadrant l’usage des nanomatériaux et visant à limiter l’exposition des usagers et de l’environnement, la manipulation de poudres de taille nanométrique est coûteuse et problématique dans le cadre d’un usage industriel. La nouvelle voie de synthèse qui a été développée dans le cadre de cette thèse a permis de démontrer la faisabilité de composites à matrice métallique et à renfort particulaire nanométrique, dimension moyenne de 30 nm, sans avoir recourt initialement à des poudres de taille nanométrique. Le procédé étudié consiste en une réaction chimique à haute température entre deux matériaux précurseurs qui conduit à la formation in-situ non seulement du renfort mais aussi de la matrice. Par rapport aux techniques de synthèse classiques, cette technique permet de synthétiser des nanoparticules in situ et d’en contrôler la taille. De plus, la matrice et le renfort étant co produits par la réaction à haute température, l’interface entre les deux phases est exempte de couches d’oxydes, ce qui lui assure une très bonne adhésion. Dans le cadre du projet ANR NanoTiCAl, la faisabilité de cette nouvelle méthode a été étudiée à travers le cas d'un composite à matrice aluminium renforcé par des particules de carbure de titane (TiC). Les synthèses ont été réalisées entre 900°C et 1000°C à partir d’un couple de précurseurs incluant le graphite et un aluminiure de titane (Al3Ti). Le composite obtenu, caractérisé par un taux de renfort élevé de 34wt.%, possède un module de Young de 106 GPa, un allongement maximal à la rupture de 6% ainsi qu’une énergie à rupture de l’ordre de 28 J.cm-3. Ces valeurs démontrent un compromis entre résistance et capacité d’endommagement original et particulièrement intéressant, jamais observé dans la littérature pour des composites d’une teneur en renfort aussi importante. La caractérisation fine de la microstructure du composite ainsi que du renfort TiC après extraction du composite massif, ont permis de mieux comprendre les mécanismes à l’oeuvre dans cette voie de synthèse réactive. Enfin, sur la base de la compréhension obtenue dans le cas du composite Al/TiC, des critères ont été identifiés permettant d’aller vers une généralisation de ce procédé de synthèse. La pertinence de cette généralisation a finalement pu être démontrée par quelques mises en application à d’autres systèmesMetal Matrix Composites (MMCs) have attracted research and industrial attentions as materials for high technological applications in the aeronautic and aerospace industry. The MMCs differ by their high specific mechanical properties compared to light weight alloys. The most commonly used are the Particulate Reinforcement Metal Matrix Composites (PRMMCs), especially the Al based matrices because of their low density.This thesis deals with the reactive synthesis of PRMMCs reinforced by nanoparticles. Because of the standards governing the use of nanomaterials to limit the exposure of users and environment, handling nanoscaled powders is very problematic and expensive in industry. Furthermore, the cost of this kind of processes is very high. This new synthesis route, developed during this thesis, shows the feasibility of PRMMCs reinforced by nanosized particles, with a mean size of 30 nm, without using any starting nanoparticles.The process consists in a chemical reaction at high temperature between precursor materials which leads to form both of the matrix and the reinforcement phase. Compared to conventional synthesis techniques as stir casting, this route allows to synthesis nanoparticles in-situ and to control their size. In addition, the matrix and the reinforcement, which are formed by a reaction at high temperature, have an interface free of oxide layers which assures a good adhesion.In the NanoTiCAl project, the feasibility of this new method is illustrated in the case of an aluminium based composite reinforced by titanium carbide (TiC). The synthesis were realized between 900°C and 1000°C from a couple of precursors including graphite and titanium aluminide (Al3Ti). The resulting composite, characterized by a high reinforcement ratio (34 wt.%), presents a Young’s modulus of 106 GPa, a maximum elongation of 6 % and a high toughness, about 28 J.cm-3. These values represent an uncommon compromise between strength and toughness never seen in the literature regarding to the high content of reinforcement.The characterization of the composite microstructure and of the reinforcement phase, after extraction of the solid composite, allowed a better understanding of the reaction mechanism during the reactive synthesis. Finally, based on our understanding of the Al-TiC composite, criteria have been identified to generalize this synthesis process. This generalization was demonstrated with success in other systems
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Walden, Sarah L. "Nonlinear optical properties of ZnO and ZnO-Au composite nanostructures for nanoscale UV emission". Thesis, Queensland University of Technology, 2017. https://eprints.qut.edu.au/114126/9/Sarah_Walden_Thesis.pdf.
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This thesis investigates the nonlinear optical properties of ZnO and ZnO-Au composite nanostructures. For applications such as photodynamic therapy, it is desirable to use nanoparticles to generate localised UV emission while illuminating them with visible or infrared light. This is possible using nonlinear optical processes such as two photon absorption. Nonlinear optical processes however, are extremely weak, so this work investigates the potential of increasing the efficiency of two photon absorption in ZnO nanoparticles by coupling them to metal nanoparticles. Using new experimental methods, the two photon absorption and resulting UV emission from the nanoparticles are measured.
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Ma, Yu. "Effects of TiB2 nanoparticles on the interfacial precipitation and mechanical properties of Al-Zn-Mg-Cu matrix composites". Thesis, Université Paris-Saclay (ComUE), 2019. http://www.theses.fr/2019SACLS252.
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L’influence des renforts nanoparticules de TiB2 (6 wt.%) sur la précipitation interfaciale de la phase (Zn1.5Cu0.5)Mg, la résistance à la traction et la fissuration sous chargement de fatigue (fatigue crack growth-FCG) des composites à matrice de Al-Zn-Mg-Cu ont été étudiées. Des échantillons de composites ont été obtenus par réaction in-situ pendant le moulage suivi d’un FSP (friction stir processing) et une extrusion à chaud. Seuls les échantillons moulés et extrudés ont été utilisés pour étude de FCG à cause de la limitation de la taille après FSP. Des observations au microscope électronique à balayage (SEM), avec la diffraction des électrons rétrodiffusés (SEM/EBSD) et au microscope électronique en transmission à haute résolution (HRSTEM) ont été réalisées pour caractériser la microstructure.Des échantillons présentent une structure des grains équi-axiaux et des nanoparticules de TiB2 sont distribuées de façon homogène dans la matrice. En état de solution solide, l’interface TiB2/Al est de nature semi-cohérente et très propre. En état de vieillissementou ou sur vieillissement, la précipitation interfacaile hétérogène de la phase (Zn1.5Cu0.5)Mg a été observée. La cinétique de la précipitation interfaciale a été discutée. Les interfaces entre Al/(Zn1.5Cu0.5)Mg/TiB2 sont quasi cohérentes et l’interface TiB2/Al a été renforcée grâce à la réduction de l’énergie de l’interface. Ce mécanisme de précipitation interfaciale peut expliquer l’effet de renforcement de l’interface contribuant simultanement l’augmentation de la résistance et de l’élongation des échatillons de composite.La majorité de nanoparticules TiB2 tentent de s’agglomérer le long des joints de grains dans des échantillons sans FSP. La vitesse de croissance de fissure a été augmentée à l’intérieur des grains avec un facteur d’intensité (ΔK) intermédiaire ou important à cause de l’affinement de grains. Cependant, la vitesse de croissance de fissure a été diminuée aux joints de grains avec (ΔK) faible ou intermédiaire à cause de la présence des clusters de TiB2 tandis que cette vitesse augmente avec (ΔK) important à cause de la coalescence des microporesThe influences of TiB2 reinforcement nanoparticles (6 wt.%) on the interfacial precipitation of (Zn1.5Cu0.5)Mg phase, the associated tensile and fatigue crack growth (FCG) properties of the Al-Zn-Mg-Cu matrix composites have been studied. The composite samples were produced by in-situ reaction during casting followed by friction stir processing (FSP) and hot extrusion, while only casted and extruded samples were used for evaluating FCG due to size limit of the nugget zone after FSP. Scanning electron microscopy (SEM), electron backscatter diffraction (EBSD) and high-resolution scanning transmission electron microscopy (HRSTEM) were employed for the microstructure characterization.The as-processed composite samples contain the fine equiaxed-grain structure, where TiB2 nanoparticles are homogenously distributed. At solid-solution state, the TiB2/Al interfaces are featured by the clean and semi-coherent nature. At the peak-aged and overaged states, the interface precipitate determined as (Zn1.5Cu0.5)Mg phase was formed, and the underlying heterogeneous interfacial precipitation kinetics was discussed. The Al/(Zn1.5Cu0.5)Mg/TiB2 multi-interfaces were revealed to be almost coherent, and the TiB2/Al interfaces were thus strengthened due to the greatly reduced coherency strains. This mechanism was proposed as precipitation assisted interface strengthening, which has contributed to the simultaneously enhanced tensile strength and uniform elongation of the as-processed composite.The majority of TiB2 nanoparticles tend to aggregate along grain boundaries (GBs) in the composite samples without FSP. The FCG rate is increased inside grains at intermediate and high stress intensity factor (ΔK) ranges due to the refined grain size. However, the FCG rate at the GBs is decreased at the low and intermediate ΔK ranges by fatigue crack deflection and trapping due to the presence of TiB2 clusters, while it increases at the high ΔK range due to microvoid coalescence
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D'britto, V. "Synthesis of metal nanoparticles and polymer/metal nanoparticle composites: investigation towards biological applications". Thesis(Ph.D.), CSIR-National Chemical Laboratory, Pune, 2010. http://dspace.ncl.res.in:8080/xmlui/handle/20.500.12252/3716.
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Lee, Tung Chun. "Cucurbit[n]uril-metal nanoparticle composites". Thesis, University of Cambridge, 2012. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.610335.
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The research presented in this dissertation pioneers a new area of study in CB[n]-metal nanoparticle (CB[n]-NP) supramolecular assemblies. While many of the supramolecular motifs are only functional in organic media, cucurbit[n]urils (CB[n]s), as a result of their water solubility and unique multi-functional macrocyclic structure, are promising as a series of robust supramolecular building blocks for both self-assembly of the CB[n]-NP organic-inorganic composite frameworks and the subsequent molecular recognition of small organic molecules in aqueous media. While various ways in integrating CB[n]s with metal nanoparticles have been investigated, two major systems are presented here, namely, portal binding (Type III) and indirect binding (Type IV) composites. Chapter 1 introduces metal nanoparticles based on their unique properties and the corresponding applications in photonics, catalysis and as nano-scaffolds. After a brief description of various supramolecular motifs, macrocyclic molecules will be highlighted as a series of robust supramolecular building blocks. Motivations and challenges in incorporating supramolecular self-assembling and molecular-recognition motifs into nanomaterials are then discussed and illustrated by specific examples in the literature. Precedent examples of composites between macrocyclic molecules and metal nanoparticles are critically reviewed in the latter part of the chapter. Chapter 2 describes the synthesis and characterisation of aqueous metastable gold nanoparticles (AuNPs*), which were discovered to be a facile intermediate in the fabrication of CB[n]-AuNPs. Although similar syntheses have been reported, there is no report on investigating the “metastability” of these AuNPs* or optimising different parameters for practical uses. In the absence of any additional stabilising ligands, AuNPs* are only stabilised by a layer of adsorbed chloride ions, which can then be easily displaced by a wide variety of water-soluble ligands, including weakly bound CB[n]s. This serves as an important foundation for the subsequent research in Type III CB[n]-AuNP systems which will be discussed in detail in the next two chapters. Chapter 3 focuses on the synthesis and characterisation of Type III CB[n]-AuNP supramolecular composites, in which the CB[n] molecules are dynamically capped by AuNPs on either or both of their portals. The CB[n]-AuNPs can then further self-assemble and form well-defined dynamic aggregates in aqueous media, with a controllable ratio between singly and doubly capped CB[n]s. The first report of Type III CB[n]-AuNP in the literature is presented here, contributing to the early development of this field of study which is now being pursued together with a number of research groups around the world. Owing to the high rigidity and well-defined molecular geometry of such molecules, CB[n]s can act as a precise sub-nanometer junction between plasmonically active AuNPs within the dynamic composites. Chapter 4 focuses on discussing the plasmonic properties of these Type III CB[n]-AuNP systems, and their applications in surface-enhanced Raman scattering (SERS) spectroscopy. Through the aid of computational simulation, we are able to assign each major peak in the Raman and SERS spectra, as well as understand their systematic shifts across the CB[n] homologues. Armed with such fundamental knowledge, we then further employ the SERS-technique to study the aggregation kinetics and the corresponding evolution of plasmonic behaviours of the Type III CB[n]-AuNP systems. The precise and well-defined plasmonic junctions, created by doubly AuNP-capped CB[n]s, allow aggregation kinetics to be studied in the finest details, which is unprecedented in any previous reports. Furthermore, hydrophobic cavity of the CB[n] hosts offers the possibility for small organic guest molecules to be encapsulated right at the heart of these plasmonic hot spots, leading to a self-calibrated molecular-recognition-based in situ SERS sensing system. An initial example of this powerful sensing system is presented at the end of the chapter. Chapter 5 highlights an alternative promising strategy in building up dynamic hierarchical materials in different solvents. The first part of this chapter describes a novel method of dispersing AuNPs within a polymer matrix. Thiol-terminated ureido-pyrimidinone (UPy)-functionalised polymers are attached to AuNPs, creating a polymeric shell with quadruple hydrogen-bonding units on the periphery. The second part of the chapter focuses on Type IV CB[8]-NP supramolecular composites, in which CB[8] and metal nanoparticles are indirectly tethered via host-guest complexation with guests that are covalently anchored on the surface of nanoparticles. While CB[8], a larger homologue in the CB[n] family, can simultaneously accommodate two complementary guests in its cavity, it can act as a robust and versatile “supramolecular handcuff” that ligates appropriately functionalised molecules and nano-objects together in a reversible manner. Dynamic hierarchical composites based on self-assembly between guest-functionalised AuNPs and a water-soluble polymer with pendant complementary guests is presented.
Książki na temat "Composite metal nanoparticles"
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Roca, Alejandro G., Paolo Mele, Hanae Kijima-Aoki, Elvira Fantechi, Jana K. Vejpravova, Martin Kalbac, Satoru Kaneko i Tamio Endo, red. Surfaces and Interfaces of Metal Oxide Thin Films, Multilayers, Nanoparticles and Nano-composites. Cham: Springer International Publishing, 2021. http://dx.doi.org/10.1007/978-3-030-74073-3.
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Capek, Ignác. Noble Metal Nanoparticles: Preparation, Composite Nanostructures, Biodecoration and Collective Properties. Springer, 2017.
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Capek, Ignác. Noble Metal Nanoparticles: Preparation, Composite Nanostructures, Biodecoration and Collective Properties. Springer, 2018.
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Capek, Ignác. Noble Metal Nanoparticles: Preparation, Composite Nanostructures, Biodecoration and Collective Properties. Springer, 2017.
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Parameswaranpillai, Jyotishkumar, Sanjay Mavinkere Rangappa, Suchart Siengchin, M. Ozgur Seydibeyoglu i Yashas Gowda T. G. Metal Nanoparticle-Based Polymer Composites. Elsevier Science & Technology, 2022.
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Parameswaranpillai, Jyotishkumar, Sanjay Mavinkere Rangappa, Suchart Siengchin, M. Ozgur Seydibeyoglu i Yashas Gowda T. G. Metal Nanoparticle-Based Polymer Composites. Woodhead Publishing, 2022.
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Mele, Paolo, Alejandro G. Roca, Hanae Kijima-Aoki, Elvira Fantechi i Jana K. Vejpravova. Surfaces and Interfaces of Metal Oxide Thin Films, Multilayers, Nanoparticles and Nano-Composites: In Memory of Prof. Dr. Hanns-Ulrich Habermeier. Springer International Publishing AG, 2022.
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Mele, Paolo, Alejandro G. Roca, Hanae Kijima-Aoki, Elvira Fantechi i Jana K. Vejpravova. Surfaces and Interfaces of Metal Oxide Thin Films, Multilayers, Nanoparticles and Nano-Composites: In Memory of Prof. Dr. Hanns-Ulrich Habermeier. Springer International Publishing AG, 2021.
Znajdź pełny tekst źródłaCzęści książek na temat "Composite metal nanoparticles"
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Mallick, Priyambada, Santosh Ku Satpathy i Srikanta Moharana. "Nanomaterials for Fabrication of Thermomechanical Robust Composite". W Nanoparticles Reinforced Metal Nanocomposites, 297–315. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-9729-7_10.
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Kumawat, Yogesh Kumar, Rishabh Sehgal, Irfan Ayoub, Rakesh Sehgal i Vijay Kumar. "Recent Progress in the Development of Metallic Composite for Advanced Technologies". W Nanoparticles Reinforced Metal Nanocomposites, 53–87. Singapore: Springer Nature Singapore, 2023. http://dx.doi.org/10.1007/978-981-19-9729-7_3.
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Yang, Jun, i Hui Liu. "A General Phase Transfer Approach for Metal Ions and Nanoparticles". W Metal-Based Composite Nanomaterials, 11–29. Cham: Springer International Publishing, 2014. http://dx.doi.org/10.1007/978-3-319-12220-5_2.
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Okanigbe, Daniel Ogochukwu, i Shade Rouxzeta Van Der Merwe. "Thermal and Mechanical Properties (I): Optimum Predictive Thermal Conduction Model Development for Epoxy-Filled Copper Oxide Nanoparticles Composite Coatings on Spent Nuclear Fuel Steel Casks". W Resource Recovery and Recycling from Waste Metal Dust, 135–68. Cham: Springer International Publishing, 2023. http://dx.doi.org/10.1007/978-3-031-22492-8_7.
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Cardenas, Victor M., i Carlos A. Villarreal B. "Hardening of Metal Matrix Composites with Ceramic Nanoparticles". W Communications in Computer and Information Science, 346–58. Cham: Springer International Publishing, 2020. http://dx.doi.org/10.1007/978-3-030-42531-9_28.
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Morales-Luckie, Raul Alberto, Alfredo Rafael Vilchis-Nestor, Victor Sanchez-Mendieta i Juan P. Hinestroza. "Bio-Inspired Synthesis of Metal Nanoparticles Using Cellulosic Substrates as Nature Templates". W Cellulose Based Composites, 233–48. Weinheim, Germany: Wiley-VCH Verlag GmbH & Co. KGaA, 2014. http://dx.doi.org/10.1002/9783527649440.ch12.
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Dékány, I., S. Papp i R. Patakfalvi. "Synthesis and characterization of noble metal nanoparticles/kaolinite composites". W From Colloids to Nanotechnology, 88–95. Berlin, Heidelberg: Springer Berlin Heidelberg, 2004. http://dx.doi.org/10.1007/978-3-540-45119-8_15.
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Singh, Pawandeep, Vivudh Gupta i Md Irfan ul Haque Siddiqui. "Tribological behaviour of aluminium metal composites reinforced with nanoparticles". W Nanomaterials for Sustainable Tribology, 53–64. Boca Raton: CRC Press, 2023. http://dx.doi.org/10.1201/9781003306276-3.
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Hyder, M. K. Mohammad Ziaul, i Sajjad Husain Mir. "Performance of Metal-Based Nanoparticles and Nanocomposites for Water Decontamination". W Inorganic-Organic Composites for Water and Wastewater Treatment, 65–112. Singapore: Springer Singapore, 2021. http://dx.doi.org/10.1007/978-981-16-5928-7_3.
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Vorozhtsov, S., D. Eskin, A. Vorozhtsov i S. Kulkov. "Physico-Mechanical and Electrical Properties of Aluminum-Based Composite Materials with Carbon Nanoparticles". W Light Metals 2014, 1373–77. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2014. http://dx.doi.org/10.1002/9781118888438.ch229.
Pełny tekst źródłaStreszczenia konferencji na temat "Composite metal nanoparticles"
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Marzbanrad, Bahareh, Ehsan Marzbanrad i Hamid Jahed. "Cold Spray Deposition of Aluminium 6061 Decorated with Al2O3 Nanoparticles". W ITSC 2023. ASM International, 2023. http://dx.doi.org/10.31399/asm.cp.itsc2023p0574.
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Abstract This research presents a novel approach for producing metal matrix composite powders using a nanoparticle decoration technique. A 1wt% stable suspension of 30nm Al2O3 particles was decorated onto primary AA6061using a redispersion method. The resulting AA6061-1wt% Al2O3 composite powder was mixed in a rotary mixer for one hour and subsequently dried at 45°C. Scanning electron microscopy of the composite powder confirmed the successful material composition. The composite powders were then deposited onto an AA6061 substrate using a low-pressure cold spray system, with the coating quality, deposition efficiency, surface roughness, and hardness of the deposited materials analyzed. After heat treatment at 430oC, the role of the nanoparticles in hindering recrystallization was studied, with Orowan strengthening shown to be the main mechanism for preventing recrystallization and grain growth. This technique provides a promising alternative method for producing metal matrix composites and offers potential for further exploration of their properties and applications.
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Chang, Sehoon, Shannon L. Eichmann i Wei Wang. "Nanoparticle Tracers in Reservoir-On-A-chip by Surface-Enhanced Raman Scattering - Fluorescence SERS-SEF Imaging Technology". W SPE Middle East Oil & Gas Show and Conference. SPE, 2021. http://dx.doi.org/10.2118/204704-ms.
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Abstract Nanoparticles or nanocomposite fluids are injected into oil reservoirs for reservoir tracing or to improve injectivity or recovery of oil. Effective application of nanoparticles in fluid flooding still needs to be investigated. Dual-mode surface-enhanced Raman scattering (SERS) - surface-enhanced fluorescence (SEF) composite nanoparticles have been developed as nanoparticle reservoir tracers. This presentation discusses their transport and detectability in porous media, providing valuable information for understanding the role of nanoparticles in EOR process. The dual-mode surface-enhanced Raman scattering (SERS) - surface-enhanced fluorescence (SEF) composite nanoparticles are synthesized composed of Ag or Au metal cores, specific dye molecules, and a SiO2 shell materials. To optimize maximum signal enhancement of both phenomena such as SERS and SEF, the distance between core metal nanoparticles and dye molecules are precisely controlled. The synthesized composite nanoparticles barcoded with dye molecules are detectable by both fluorescence and Raman spectroscopies due to the SERS-SEF phenomena. Both fluorescence and Raman microscopic images of dye embedded surfaceenhanced Raman scattering (SERS) surface-enhanced fluorescence (SEF) composite nanoparticles in water phase successfully were collected within microfluidic reservoir-on-a-chip. The reservoir-on-a-chip utilized in this study fabricated based on reservoir rock geometry and coated with calcium carbonate. The synthesized SERS-SEF composite nanoparticles in water solution have been flooded into the microfluidic reservoir-on-a-chip and imaged for probing interfacial behavior of fluids such as liquid-liquid interfaces and studying the behavior of nanoparticles at liquid-rock interfaces. The precise synthesis method to produce the composite nanoparticles has been developed for the embedded dye molecules to generate noticeably enhanced detectability due to the strong SERS phenomenon. In conclusion, SERS-SEF nanoparticles barcoded with the fingerprinted Raman and fluorescence signals can provide a possible pathway toward SERS-SEF nanoprobe as various barcoded tracers to understand fluid behavior in porous media. Composite nanoparticle synthesis and its detection in flow technologies have been developed for visualization of the fluid flow behavior in porous media representing reservoir rock geometry. The results of the high-resolution nanoparticle fluid imaging data in reservoir-on-a-chip can be applied to understand mechanism of nanoparticle fluid assisted chemical enhanced oil recovery.
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LI, FAN, SARAH A. DELO i ANDREAS STEIN. "SHAPED METAL OXIDE-PHOSPHATE COMPOSITE NANOPARTICLES SYNTHESIZED BY TEMPLATED DISASSEMBLY". W Proceedings of the 5th International Symposium. WORLD SCIENTIFIC, 2008. http://dx.doi.org/10.1142/9789812779168_0040.
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Yumozhapova, N. V., i A. V. Nomoev. "Modeling the formation and transport characteristics of composite metal/semiconductor nanoparticles". W HIGH-ENERGY PROCESSES IN CONDENSED MATTER (HEPCM 2020): Proceedings of the XXVII Conference on High-Energy Processes in Condensed Matter, dedicated to the 90th anniversary of the birth of RI Soloukhin. AIP Publishing, 2020. http://dx.doi.org/10.1063/5.0028825.
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Xu, Dongyan, Joseph P. Feser, Yang Zhao, Hong Lu, Peter Burke, Arthur C. Gossard i Arun Majumdar. "Thermal Conductivity Characterization and Modeling of P-Type Metal/Semiconductor Nanocomposites". W 2010 14th International Heat Transfer Conference. ASMEDC, 2010. http://dx.doi.org/10.1115/ihtc14-23298.
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Semiconductor alloys with epitaxially embedded nanoparticles have been shown to be very promising materials for thermoelectric energy conversion applications. In this work, we report on thermal conductivity characterization of two classes of p-type nanoparticle-in-alloy composite materials: compensated InGaAs semiconductor matrix with randomly distributed ErAs nanoparticles, and GaSb and its alloys with embedded ErSb nanoparticles. The three omega method is used to measure thermal conductivity of all materials. It is shown that thermal conductivity of compensated p-type ErAs:InGaAs is comparable to the n-type ErAs:InGaAs and it reduces with the increase in the erbium concentration. ErSb:GaSb nanocomposites are intrinsically p-type and show a thermal conductivity substantially lower than the pure GaSb compound. By comparing nanostructured samples from alloyed (InGaSb) and unalloyed (GaSb) matrix materials, we show that alloying is complimentary to the role of the nanostructure in reducing thermal conductivity. We also discuss Boltzmann transport modeling that indicates an optimum nanocrystal size, and the prospects for further reductions in the lattice thermal conductivity.
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Kalinkevich, O. V., A. M. Sklyar, A. N. Kalinkevich, S. N. Danilchenko, Ye I. Zinchenko, Ya V. Trofimenko, O. Yu Karpenko, V. A. Baturin, V. M. Holubnycha i M. V. Pogorielov. "Chitosan-Based Composite Materials Comprising Metal or Metal Oxide Nanoparticles: Synthesis, Characterization and Antimicrobial Activity". W 2018 IEEE 8th International Conference Nanomaterials: Application & Properties (NAP). IEEE, 2018. http://dx.doi.org/10.1109/nap.2018.8914920.
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Sawale, Alka, Kancharla Harsha Vardhan Reddy, Kailash Poornashree i Puja Savdas Dosa Karmur. "Fabrication of aluminum metal matrix composite with carbon nanoparticles via stir casting". W PROCEEDINGS OF THE 14TH ASIA-PACIFIC PHYSICS CONFERENCE. AIP Publishing, 2021. http://dx.doi.org/10.1063/5.0036311.
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James, Sagil, i Shayan Nejadian. "Preliminary Study on High-Speed Machining of Hybrid Composite Stacks Using Nanoparticle Enhanced MQL". W ASME 2020 15th International Manufacturing Science and Engineering Conference. American Society of Mechanical Engineers, 2020. http://dx.doi.org/10.1115/msec2020-8523.
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Abstract Hybrid composite stacks are multi-material laminates which find extensive applications in industries such as aerospace, automobile, and electronics. Most hybrid composites consist of multi-layer fiber composites, and metal sheets stacked together. These composite stacks have excellent physical and mechanical properties, including high strength, high hardness, high stiffness, excellent fatigue resistance, and low thermal expansion. Composite stacks are fabricated to near net shape; additional machining operations are often required for several applications, primarily in the aerospace industry. The most frequent machining operation is high-speed cold saw cutting of these hybrid stacks within specified tolerances. During the cutting process, the cutting fluids play a significant role by reducing the cutting temperature and cutting forces, thereby increasing the surface quality finish of the hybrid composite stack. However, most of the cutting fluids pose environmental and health risks. Recently, researchers have been exploring the possibilities of using MQL to overcome the adverse effects of traditional cutting fluids. This research investigates MQL based cutting of hybrid composite stacks using different types of nanoparticle-enhanced vegetable oils. Specifically, the nanoparticles of choice that have found extensive popularity within the booming nano industry: Al2O3, Al(s), Ni(s), and Carbon Nanotubes (SWCNTs). For this study, CFRP/Al and CFRP/Ti composite stacks are used as the substrates. The effects of critical process parameters on the quality, surface roughness, and interface delamination of the composite materials are studied. The process parameters under consideration include the type of vegetable oils utilized, namely, jojoba and castor oil, the nanoparticle-enhancement effects, and the construction of the hybrid composite stack. From the results of this study, it is found that the chemistry between the MQL of choice and the dispersion of the nanoparticles is of critical importance. The results of this study are expected to open new possibilities for eco-friendly and cost-effective methods for cold saw cutting advanced engineering materials.
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Mao, Haiyang, Ruirui Li, Chengjun Huang, Yuncong Jia, Weibing Wang, Anjie Ming i Jijun Xiong. "A highly SERS-active and flexible droplet based on carbon-metal composite nanoparticles". W 2017 19th International Conference on Solid-State Sensors, Actuators and Microsystems (TRANSDUCERS). IEEE, 2017. http://dx.doi.org/10.1109/transducers.2017.7994305.
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Ishiguro, H., E. Yokoyama i M. Wakaki. "Synthesis and optical properties of ZnO composite films embedded with noble metal nanoparticles". W Frontiers in Optics. Washington, D.C.: OSA, 2012. http://dx.doi.org/10.1364/fio.2012.fth1a.6.
Pełny tekst źródłaRaporty organizacyjne na temat "Composite metal nanoparticles"
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Chefetz, Benny, Baoshan Xing, Leor Eshed-Williams, Tamara Polubesova i Jason Unrine. DOM affected behavior of manufactured nanoparticles in soil-plant system. United States Department of Agriculture, styczeń 2016. http://dx.doi.org/10.32747/2016.7604286.bard.
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The overall goal of this project was to elucidate the role of dissolved organic matter (DOM) in soil retention, bioavailability and plant uptake of silver and cerium oxide NPs. The environmental risks of manufactured nanoparticles (NPs) are attracting increasing attention from both industrial and scientific communities. These NPs have shown to be taken-up, translocated and bio- accumulated in plant edible parts. However, very little is known about the behavior of NPs in soil-plant system as affected by dissolved organic matter (DOM). Thus DOM effect on NPs behavior is critical to assessing the environmental fate and risks related to NP exposure. Carbon-based nanomaterials embedded with metal NPs demonstrate a great potential to serve as catalyst and disinfectors. Hence, synthesis of novel carbon-based nanocomposites and testing them in the environmentally relevant conditions (particularly in the DOM presence) is important for their implementation in water purification. Sorption of DOM on Ag-Ag₂S NPs, CeO₂ NPs and synthesized Ag-Fe₃O₄-carbon nanotubebifunctional composite has been studied. High DOM concentration (50mg/L) decreased the adsorptive and catalytic efficiencies of all synthesized NPs. Recyclable Ag-Fe₃O₄-carbon nanotube composite exhibited excellent catalytic and anti-bacterial action, providing complete reduction of common pollutants and inactivating gram-negative and gram-positive bacteria at environmentally relevant DOM concentrations (5-10 mg/L). Our composite material may be suitable for water purification ranging from natural to the industrial waste effluents. We also examined the role of maize (Zeamays L.)-derived root exudates (a form of DOM) and their components on the aggregation and dissolution of CuONPs in the rhizosphere. Root exudates (RE) significantly inhibited the aggregation of CuONPs regardless of ionic strength and electrolyte type. With RE, the critical coagulation concentration of CuONPs in NaCl shifted from 30 to 125 mM and the value in CaCl₂ shifted from 4 to 20 mM. This inhibition was correlated with molecular weight (MW) of RE fractions. Higher MW fraction (> 10 kDa) reduced the aggregation most. RE also significantly promoted the dissolution of CuONPs and lower MW fraction (< 3 kDa) RE mainly contributed to this process. Also, Cu accumulation in plant root tissues was significantly enhanced by RE. This study provides useful insights into the interactions between RE and CuONPs, which is of significance for the safe use of CuONPs-based antimicrobial products in agricultural production. Wheat root exudates (RE) had high reducing ability to convert Ag+ to nAg under light exposure. Photo-induced reduction of Ag+ to nAg in pristine RE was mainly attributed to the 0-3 kDa fraction. Quantification of the silver species change over time suggested that Cl⁻ played an important role in photoconversion of Ag+ to nAg through the formation and redox cycling of photoreactiveAgCl. Potential electron donors for the photoreduction of Ag+ were identified to be reducing sugars and organic acids of low MW. Meanwhile, the stabilization of the formed particles was controlled by both low (0-3 kDa) and high (>3 kDa) MW molecules. This work provides new information for the formation mechanism of metal nanoparticles mediated by RE, which may further our understanding of the biogeochemical cycling and toxicity of heavy metal ions in agricultural and environmental systems. Copper sulfide nanoparticles (CuSNPs) at 1:1 and 1:4 ratios of Cu and S were synthesized, and their respective antifungal efficacy was evaluated against the pathogenic activity of Gibberellafujikuroi(Bakanae disease) in rice (Oryza sativa). In a 2-d in vitro study, CuS decreased G. fujikuroiColony- Forming Units (CFU) compared to controls. In a greenhouse study, treating with CuSNPs at 50 mg/L at the seed stage significantly decreased disease incidence on rice while the commercial Cu-based pesticide Kocide 3000 had no impact on disease. Foliar-applied CuONPs and CuS (1:1) NPs decreased disease incidence by 30.0 and 32.5%, respectively, which outperformed CuS (1:4) NPs (15%) and Kocide 3000 (12.5%). CuS (1:4) NPs also modulated the shoot salicylic acid (SA) and Jasmonic acid (JA) production to enhance the plant defense mechanisms against G. fujikuroiinfection. These results are useful for improving the delivery efficiency of agrichemicals via nano-enabled strategies while minimizing their environmental impact, and advance our understanding of the defense mechanisms triggered by the NPs presence in plants.