Relevant bibliographies by topics / Bimetallic nano

Academic literature on the topic 'Bimetallic nano'

Author: Grafiati
Published: 22 June 2024

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Contents

  1. Journal articles
  2. Dissertations / Theses
  3. Book chapters
  4. Conference papers

Journal articles on the topic "Bimetallic nano":

1

Crozier, P. A., and P. Claus. "Nano-characterization of Rh-Sn bimetallic catalysts." Proceedings, annual meeting, Electron Microscopy Society of America 54 (August 11, 1996): 224–25. http://dx.doi.org/10.1017/s0424820100163587.

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Bimetallic catalysts are of considerable importance because they possess both high activity and selectivity. Recently, there has been considerable interest in bimetallic catalysts produced by surface organometallic chemistry on metals. A detailed description of the structure and composition at the nanometer level is critical to fully understand the behavior of such catalysts. We have undertaken a study of the microstructure of Rh-Sn/SiO2 bimetallic hydrogenation catalysts.A Rh-Sn precursor was prepared by reacting tetrabutyltin with a silica supported Rh parent catalyst (1 %Rh/SiO2). The bimetallic catalysts were produced by thermal decomposition of the precursor in flowing hydrogen at 623 K. Five different catalysts were produced with a range of different Sn loadings from Rh(1%)/SiO2 to Rh(1%)-Sn(1.85%)/SiO2. The resulting bimetallic catalysts were able to selectively hydrogenate isolated and conjugated C=O functional groups. In situ XPS showed that the Sn and Rh were in the fully reduced state. Mossbauer spectroscopy studies confirmed that Sn was present in the zerovalent state indicating that no oxidized Sn was present. Preliminary IR data suggests that most of the Rh atoms are isolated from their neighbors (presumably by Sn).
2

Guisbiers, Grégory, Subarna Khanal, Francisco Ruiz-Zepeda, Jorge Roque de la Puente, and Miguel José-Yacaman. "Cu–Ni nano-alloy: mixed, core–shell or Janus nano-particle?" Nanoscale 6, no. 24 (2014): 14630–35. http://dx.doi.org/10.1039/c4nr05739b.

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Bimetallic nanoparticles like Cu–Ni are particularly attractive due to their magnetic and catalytic properties; however, their properties depend strongly on the structure of the alloy i.e. mixed, core–shell or Janus.
3

Abdelghany, A. M., A. H. Oraby, Awatif A. Hindi, Doaa M. El-Nagar, and Fathia S. Alhakami. "Green synthesis of mixed metallic nanoparticles using room temperature self-assembly." JOURNAL OF ADVANCES IN PHYSICS 13, no. 2 (March 16, 2017): 4671–77. http://dx.doi.org/10.24297/jap.v13i2.5942.

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Bimetallic nanoparticles of silver (Ag) and gold (Au) were synthesized at room temperature using Curcumin. Reduction process of silver and gold ions with different molar ratios leads to production of different nanostructures including alloys and core-shells. Produced nanoparticles were characterized simultaneously with FTIR, UV/vis. spectroscopy, transmission electron microscopy (TEM), and Energy-dispersive X-ray (EDAX). UV/vis. optical absorption spectra of as synthesized nanoparticles reveals presence of surface palsmon resonance (SPR) of both silver at (425 nm) and gold at (540 nm) with small shift and broadness of gold band after mixing with resucing and capping agent in natural extract which suggest presence of bimetallic nano structure (Au/Ag). FTIR and EDAX data approve the presence of bimetallic nano structure combined with curcumin extract. TEM micrographs shows that silver and gold can be synthesized separately in the form of nano particles using curcumin extract. Synthesis of gold nano particles in presence of silver effectively enhance and control formation of bi-metallic structure.
4

Zhang, Tao, Li Li, Zhishuang Ye, Qingsong Yang, Yuchuan Tian, and Xuhong Guo. "Preparation and characterization of Ag–Pd bimetallic nano-catalysts in thermosensitive microgel nano-reactor." RSC Advances 8, no. 33 (2018): 18252–59. http://dx.doi.org/10.1039/c8ra02563k.

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5

Chen, Ming, DaMeng Wang, and XiangDong Liu. "Direct synthesis of size-tailored bimetallic Ag/Au nano-spheres and nano-chains with controllable compositions by laser ablation of silver plate in HAuCl4 solution." RSC Advances 6, no. 12 (2016): 9549–53. http://dx.doi.org/10.1039/c5ra24578h.

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Bimetallic Ag/Au nano-spheres and nano-chains with controllable structures fabricated by laser ablation of Ag in HAuCl4 solution without any potential toxic surfactants or adding extra reductants.
6

Ugalde, M., E. Chavira, M. T. Ochoa-Lara, I. A. Figueroa, C. Quintanar, and A. Tejeda. "Synthesis by Microwaves of Bimetallic Nano-Rhodium-Palladium." Journal of Nanotechnology 2013 (2013): 1–9. http://dx.doi.org/10.1155/2013/578684.

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An improved acrylamide sol-gel technique using a microwave oven in order to synthesize bimetallic Rh-Pd particles is reported and discussed. The synthesis of Pd and Rh nanoparticles was carried out separately. The polymerization to form the gel of both Rh and Pd was carried out at 80°C under constant agitations. The method chosen to prepare the Rh and Pd xerogels involved the decomposition of both gels. The process begins by steadily increasing the temperature of the gel inside a microwave oven (from 80°C to 170°C). In order to eliminate the by-products generated during the sol-gel reaction, a heat treatment at a temperature of 1000°C for 2 h in inert atmosphere was carried out. After the heat treatment, the particle size increased from 50 nm to 200 nm, producing the bimetallic Rh-Pd clusters. It can be concluded that the reported microwave-assisted, sol-gel method was able to obtain nano-bimetallic Rh-Pd particles with an average size of 75 nm.
7

Kwak, Taejin, and Dongchoul Kim. "Controlling Equilibrium Morphologies of Bimetallic Nanostructures Using Thermal Dewetting via Phase-Field Modeling." Materials 14, no. 21 (November 7, 2021): 6697. http://dx.doi.org/10.3390/ma14216697.

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Herein, we report a computational model for the morphological evolution of bimetallic nanostructures in a thermal dewetting process, with a phase-field framework and superior optical, physical, and chemical properties compared to those of conventional nanostructures. The quantitative analysis of the simulation results revealed nano-cap, nano-ring, and nano-island equilibrium morphologies of the deposited material in thermal dewetting, and the morphologies depended on the gap between the spherical patterns on the substrate, size of the substrate, and deposition thickness. We studied the variations in the equilibrium morphologies of the nanostructures with the changes in the shape of the substrate pattern and the thickness of the deposited material. The method described herein can be used to control the properties of bimetallic nanostructures by altering their equilibrium morphologies using thermal dewetting.
8

Guczi, László. "Bimetallic nano-particles: featuring structure and reactivity." Catalysis Today 101, no. 2 (March 30, 2005): 53–64. http://dx.doi.org/10.1016/j.cattod.2005.01.002.

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Zhang, Yanlin, Chaowei Jia, Qiuyue Wang, Quan Kong, Gang Chen, Hongtao Guan, and Chengjun Dong. "MOFs-Derived Porous NiFe2O4 Nano-Octahedrons with Hollow Interiors for an Excellent Toluene Gas Sensor." Nanomaterials 9, no. 8 (July 24, 2019): 1059. http://dx.doi.org/10.3390/nano9081059.

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Toluene is extensively used in many industrial products, which needs to be effectively detected by sensitive gas sensors even at low-ppm-level concentrations. Here, NiFe2O4 nano-octahedrons were calcinated from NiFe-bimetallic metal-organic framework (MOFs) octahedrons synthesized by a facile refluxing method. The co-existence of p-Phthalic acid (PTA) and 3,3-diaminobenzidine (DAB) promotes the formation of smooth NiFe-bimetallic MOFs octahedrons. After subsequent thermal treatment, a big weight loss (about 85%) transformed NiFe2O4 nanoparticles (30 nm) into NiFe2O4 porous nano-octahedrons with hollow interiors. The NiFe2O4 nano-octahedron based sensor exhibited excellent gas sensing properties for toluene with a nice stability, fast response, and recovery time (25 s/40 s to 100 ppm toluene), and a lower detection limitation (1 ppm) at 260 °C. The excellent toluene-sensing properties can not only be derived from the hollow interiors combined with porous nano-octahedrons to favor the diffusion of gas molecules, but also from the efficient catalytic activity of NiFe2O4 nanoparticles.
10

Radhakrishnan, Ramakrishnan, Kathiravan Kannan, Sakthivel Kumaravel, and Sivakumar Thiripuranthagan. "Oxidative esterification of furfural over Au–Pd/HAP-T and Au–Ag/HAP-T bimetallic catalysts supported on mesoporous hydroxyapatite nanorods." RSC Advances 6, no. 51 (2016): 45907–22. http://dx.doi.org/10.1039/c6ra07614a.

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You might also be interested in the extended bibliographies on the topic 'Bimetallic nano' for particular source types:
Journal articles Dissertations / Theses

Dissertations / Theses on the topic "Bimetallic nano":

1

Khimyak, Tetyana. "New bimetallic clusters - precursors for heterogeneous nano-catalysts." Thesis, University of Cambridge, 2002. http://ethos.bl.uk/OrderDetails.do?uin=uk.bl.ethos.620698.

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Jegadeesan, Gautham. "Environmental catalysis using nano-sized bimetallic particles : selenium remediation /." Available to subscribers only, 2005. http://proquest.umi.com/pqdweb?did=1068236761&sid=29&Fmt=2&clientId=1509&RQT=309&VName=PQD.

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Snyder, Brian. "An investigation into bimetallic hollow nanoparticles in catalysis." Thesis, Georgia Institute of Technology, 2013. http://hdl.handle.net/1853/47614.

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Nanocatalysis, catalysis using particles on the nanoscale, is an emerging field that has tremendous potential. Nanoparticles have different properties than bulk material and can be used in different roles. Macro sized precious metals, for example, are inert, but nanoparticles of them are becoming more widely used as catalysts. Understanding the manner in which these particles work is vital to improving their efficacy. This thesis focuses on two aspects of nanocatalysis. Chapter 1 begins with a brief introduction into nanotechnology and some of the areas in which nanoparticles are different than bulk particles. It then proceeds into an overview of catalysis and nanocatalysis more specifically. Focus is brought to the definitions of the different types of catalysis and how those definitions differ when applied to nanoparticles. Chapter 2 is in finding an inert support structure to more easily assist in recycling the nanoparticles. Polystyrene microspheres were studied and found to prevent platinum nanoparticles from aggregating in solution and possibly aid in recycling of the nanoparticles. These nanoparticles were used in catalysis, aiding in the reduction of 4-nitrophenol in the presence of sodium borohydride. While the rate decreased by a factor of ~ 7 when using the polystyrene, the activation energy of the reaction was unaltered, thus confirming the inactivity of the polystyrene in the reaction. In Chapter 3, nanocatalysis was studied by examining bimetallic hollow nanoparticles with specific attention to the effect of altering the ratios of the two metals. Ten different bimetallic nanocages were tested in an electron transfer reaction between hexacyanoferrate and thiosulfate. Five PtAg nanocages and five PdAg with varying metal ratios were prepared and studied. It was found that while silver cubes immediately precipitate out of solution when combined with thiosulfate, a small amount of either platinum or palladium allows the particles to remain in solution and function as a substantially more effective catalyst. However, as additional Pt was added the activation energy increased. To obtain a better understanding of the catalysis using bimetallic cages, the evolution of these cages was studied as the 2nd metal was added. Initially the particle edge length increased and then slowly decreased back to the size of the template cubes. The increase in edge length suggests of addition of material to the nanoparticles. This indicated the 2nd metal is on the outside of the cage, which was confirmed using UV-Vis spectroscopy and EDS mapping. By understanding how these bimetallic particles evolve, we may be able to manipulate these synthetic methods to more precisely design nanoparticles for catalysis.
4

Agarwal, Shirish. "Palladium/Magnesium Bimetallic Systems for Dechlorination of Polychlorinated Biphenyls." Cincinnati, Ohio : University of Cincinnati, 2009. http://www.ohiolink.edu/etd/view.cgi?acc_num=ucin1236037376.

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Thesis (Ph.D.)--University of Cincinnati, 2009.
Advisors: Dionysios Dionysiou (Committee Chair), Souhail Al-Abed (Committee Member), George Sorial (Committee Member), Margaret Kupferle (Committee Member). Title from electronic thesis title page (viewed April 22, 2009). Keywords: PCBs; Dechlorination; Pd/Mg; Bimetallic; Reduction pathway; intermediates; aggressive anions; sediment; nano-synthesis; nano-scaling; sulfide poisoning. Includes abstract. Includes bibliographical references.
5

Liao, Fenglin. "The development of Pd-based bimetallic nano-catalysts in green chemistry." Thesis, University of Oxford, 2015. https://ora.ox.ac.uk/objects/uuid:2fb03ce6-ba32-4102-96fc-f00fc7593bc0.

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With the gradual depletion of the non-renewable fossil fuel resources and the emerging environmental concerns, the need of exploring renewable synthesis routes of our daily basic stocks is rising. Due to the large contribution to the global primary energy (up to 40% in some countries), biomass has recently been advocated to be one of the most promising alternatives for fossil fuel. This thesis focuses on the catalytic transformations of biomass or biomass derived molecules into valuable small alcohols such as methanol, ethanol, and propanol, which can be used as both fuel and chemical synthesis intermediates. Novel catalysts with high activity and selectivity toward target products are desperately required in the development of renewable chemical synthesis routes. In the past 200 years, platinum metal catalysts have been widely used in the industry. But nowadays, Pd is attracting increasing attentions due to (i) its similar physicochemical properties to those of Pt, (ii) its higher natural abundance than Pt. Alloying has been demonstrated as an effective method in enhancing the catalytic properties of noble metals. In this thesis, a new and facile method for the preparation of supported bimetallic NPs with tunable compositions is developed. Through the establishment of a type II hetero-junction in support, controllable amounts of metallic atoms can be derived from the reduction of the metal oxide support, with the assistance of a supported noble metal. A series of extremely small Pd-based bimetallic NPs with a variety of modifier atoms at tunable compositions, namely PdFe, PdCo, PdNi and PdZn, have been synthesized by this method. These novel bimetallic NPs are applied to the catalytic conversion of biomass or biomass derived molecules containing repeating vicinal diol units. It is demonstrated that the catalytic performance of Pd in bimetallic phase is governed by the d-band structure. The high degree of d-band filling and high d-band center position favour the selective C-O cleavage in hydrogenolysis of vicinal diol units. On the other hand, the selective C-C cleavage can be achieved by lowering the d-band filling of the Pd-based bimetallic NPs. The specificity of C-C bond rupture over that of C-O increases in order of PdZn < PdNi < PdCo < PdFe, with progressive d-band filling reduction, eventually reaches 95% in a series of vicinal diols hydrogenolysis. As a result, small alcohols are produced with high selectivity as the degradation products of biomass molecules when PdFe bimetallic NPs are employed as catalyst. Conversely, by incorporating Co atoms at high concentration, PdCo exhibits a high selectivity in breaking C-O bond of ethylene glycol due to the raised d-band center position and gives ethanol as the main product. Pd@Zn bimetallic NPs with an imperfect core(Pd)-shell(Zn) structure were used in a methanol synthesis route from biomass transformation via CO2 hydrogenation (CO2/H2 is produced from low temperature reforming of biomass resource). The Zn shell not only enhances the catalytic activity of Pd metal towards methanol synthesis, but also suppresses the reverse water gas shift (RWGS) reaction in which CO is produced as a by-product. Methanol can be produced as the main product over CO on the Zn rich Pd@Zn surface, even at low pressure. The methanol turnover frequency (TOF) on the exposed Pd site reaches 1.9 ×10-1 s-1 with a selectivity of 70% at 2 MPa. The enhancement is attributed to the increasing d-band filling of Pd@Zn bimetallic NPs by the progressive decoration of Zn on Pd surface, which selectively stabilizes the precursor of methanol (HCOO) over that of CO (COOH). Also, the PdZn catalyst with high ability in dissociating H2 reduces the activation barrier for methanol synthesis. The results presented in this thesis, for the first time, signify the possibility of fine-tuning of product specificity of biomass conversion simply by rationally modifying the electronic properties of the Pd-based catalysts. More importantly, these catalysts will help to diversify the energy generation and relieve our dependence on fossil fuels.
6

Kane, Kenneth. "Metallic systems at the nano and micro scale: Bimetallic nanoparticles as catalysts and MCrAlY bond coats in thermal barrier coatings." VCU Scholars Compass, 2019. https://scholarscompass.vcu.edu/etd/5732.

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The dissertation is split into two parts. The first part will be focused on changes in material properties found at the nanoscale, as miscibility and electronic structure can change significantly with size. The formation of classically-immiscible bimetallic nanoparticles (BNPs) becomes favorable at the nanoscale and novel catalytic properties can emerge from the bimetallic alloying. The formation of alloyed and non-alloyed BNPs is achieved through pulse laser ablation (PLA) and a significant increase in catalytic activity is observed for both. Recently discovered, the increased activity in the non-alloyed BNPs, deemed multicomponent photocatalysis, is examined and the proposed mechanism discussed. The second part of the talk will focus on thermal barrier coatings (TBCs), which are advanced, multi-layered coatings used to protect materials in high temperature environments. MCrAlY (M=Ni, Co) bond coats deposited via atmospheric plasma spray (APS) are intrinsically rough and initially the roughness provides a high surface area platform for the mechanical interlocking of the yttria stabilized zirconia (YSZ) top coat, which provides the bulk of the thermal insulation. After high temperature exposure, a protective oxide scale forms at the top coat/bond coat interface however the convex asperities of the bond coat can grow non-α-Al2O3 type oxides that can be detrimental for coating lifetime. A surface modification technique that removes the asperities while leaving intact the concavities is used to examine the role that roughness distribution has on 1100°C APS coating lifetime. Lastly, recent work validating a modelling strategy for evaluating 900°C TBC lifetimes, which can typically surpass 25 kh, is presented. Differences in coating-substrate interdiffusion behavior over 5-20 kh of 900°C exposure are discussed and reproduced with Thermo- Calc/DICTRA for three superalloys (1483, 247, X4) deposited with high velocity oxy fuel (HVOF) NiCoCrAlY coatings.
7

Forel, Salomé. "Single wall carbon nanotube growth from bimetallic nanoparticles : a parametric study of the synthesis up to potential application in nano-electronics." Thesis, Université Paris-Saclay (ComUE), 2017. http://www.theses.fr/2017SACLX094/document.

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Ce manuscrit présente une étude expérimentale autour de la synthèse des nanotubes de carbone et de leurs possibles intégrations dans des dispositifs. Les remarquables propriétés électroniques et optiques des nanotubes en font un matériau de choix pour entre autres, la nanoélectronique. Néanmoins, l’intégration des nanotubes dans des dispositifs performants est encore aujourd’hui un défi. Cela repose principalement sur la difficulté d’obtenir de grandes quantités de nanotubes mono-paroi avec des propriétés uniformes, propriétés qui sont définies par la structure du nanotube (i.e. leur angle chiral et leur diamètre). Ainsi, réaliser des synthèses de nanotube de carbone avec un contrôle de leur structure représente un point clé pour le progrès dans ce domaine.Nous avons donc mis en place une nouvelle méthode de synthèse de nanotubes de carbone basée sur la chimie de coordination et le dépôt chimique en phase vapeur activé par filament chaud. Cette synthèse permet la conception de nombreux nouveaux catalyseurs bimétalliques pour la croissance des nanotubes de carbone. Comme le procédé mis en place est très générique, des études paramétriques peuvent être réalisées de manière à mieux comprendre l’influence des différents paramètres de la croissance sur la structure des nanotubes obtenue. Nous discuterons ici du rôle de la température et de la composition chimique du catalyseur. Les nanotubes obtenus sont principalement caractérisés par spectroscopie Raman et par microscopies électroniques.Afin de valider les observations obtenues par spectroscopie Raman, les nanotubes synthétisés ont aussi été intégrés dans des dispositifs de type transistor à effet de champ. Une analyse des performances des transistors en fonction des différents nanotubes utilisés dans le canal est présentée.Enfin, les nanotubes intégrés dans ces transistors ont été fonctionnalisés avec un chromophore de ruthénium. Nous avons montré que cette fonctionnalisation nous permet de moduler, grâce à une impulsion lumineuse, la conductivité du dispositif sur trois ordres de grandeur
This manuscript presents an experimental study around the single wall carbon nanotubes (SWCNT) synthesis and their possible integration in nanodevices. The unique electronic and optical properties of carbon nanotubes make them a choice material for various applications, particularly in nano-electronics.Nevertheless, their integration in effective devices is still a challenge. This is mainly due to the difficulty to obtain large quantity of SWCNT with uniform properties, defined by their structure (i.e. chiral angle and diameter). Therefore, structure controlled growth of SWCNTs is a key point for progress in this field.Here, we established a new synthesis approach based on coordination chemistry and hot-filament chemical vapor deposition. This approach allows the design of various bimetallic catalyst nanoparticles for the SWCNT growth. As the synthesis process is generic, parametric study can be performed in order to better understand the influence of the various parameters on the structure of the as-grown SWCNTs. In particular, we will discuss the role of the growth temperature and the chemical composition of the catalyst on the final SWCNTs structure. The obtained SWCNTs are mainly characterized by Raman spectroscopy and electronic microscopy.In order to validate the observations performed by Raman measurement, the synthesized SWCNTs have been also integrated in field effect transistors (FET) devices. An analysis of the performance of the FET-device as a function of the SWCNTs used in its channel will be presented.Finally, SWCNTs integrated in these transistors have been functionalized with an inorganic chromophore of ruthenium.We demonstrate that the functionalization of the SWCNTs leads to a three order of magnitude reversible switch of the device conductivity triggered by visible light
8

McCoppin, Jared Ray. "FABRICATION AND MASS TRANSPORT ANALYSIS OF TAPE CAST NANO-SILVER HIGH TEMPERATURE SOLDER." Wright State University / OhioLINK, 2013. http://rave.ohiolink.edu/etdc/view?acc_num=wright1389285958.

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9

Maknun, Luluil. "Development of mass spectrometric analytical methods for the determination of iron complexes in plants and bacteria and for the determination of cobalt using bimetallic nanoparticles." Electronic Thesis or Diss., Pau, 2023. http://www.theses.fr/2023PAUU3039.

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L'objectif principal de cette recherche est le développement de méthodes analytiques utilisant une technique de séparation couplée à la spectrométrie de masse pour l'analyse de complexes de fer de faible poids moléculaire et une technique de single-particle ICP MS pour la détection de nanoparticules bimétalliques.Dans la première partie, une méthode utilisant la chromatographie liquide avec spectrométrie de masse à double détecteur, spectrométrie de masse (MS) à haute résolution par électrospray (HRAM) et spectrométrie de masse à couplage inductif (ICPMS), a été développée pour les complexes du fer (Fe) de faible poids moléculaire, appelés 'sideophore', dans un échantillon d'un sol. La complexité des échantillons étudiés, les faibles concentrations et la labilité des analytes ont posé un défi dans le développement de méthodes pour leur identification et leur quantification. Pour éliminer la matrice, une extraction en phase solide (SPE) a été développée dans des conditions acides pour purifier la majeure partie des complexes 56Fe-sidérophore et concentrée par évaporation. Les complexes 56Fe-sidérophore ont été identifiés par chromatographie d'exclusion stérique rapide (FastSEC) - Orbitrap MSn sur la base de la masse moléculaire exacte (+ 1 ppm) et de la fragmentation MS2 ou MS3. Leur capacité à échanger facilement le 56Fe naturel contre le 58Fe ajouté a été démontrée par SEC avec détection par l'ICP MS et l'ESI MS. La méthode a été appliquée à l'analyse de tourbe prélevée dans la partie orientale des montagnes pyrénéennes françaises. Dix-neuf sidérophores appartenant à quatre classes différentes ont été identifiés et quantifiés sans avoir besoin d'un standard authentique. Les résultats ont été validés à l'aide de la détection ICP MS du fer en comparant la somme des complexes de fer déterminés par échange isotopique - ESI MS dans chaque pic observé par FastSEC-ICP MS.Dans la deuxième partie du manuscrit, une méthode utilisant la spectrométrie de masse à plasma à couplage inductif -ICP-MS en mode particule unique (SP-ICP-MS) et en mode conventionnel couplée au fractionnement d'écoulement de champ (FlFFF) a été développée. Les conditions de synthèse de nanoparticules bimétalliques (BNP) Ag-Au ont été optimisées pour appliquer celles-ci à la détection colorimétrique basée sur le concept d'agrégation. Les BNP Ag-Au, synthétisés par la réduction par le citrate des ions Ag et Au, ont été utilisées comme capteurs pour la détection du Co2+. Pour mieux comprendre la détection colorimétrique du Co2+ à l'aide de BNP Ag-Au, divers mélanges de solutions ont été étudiés, notamment : (i) uniquement des BNP Ag-Au ; (ii) BNP Ag-Au avec thiosulfate; (iii) BNP Ag-Au avec thiosulfate et éthylènediamine; et (iv) Ag-Au BNPs avec thiosulfate, Co2+ et éthylènediamine. SP-ICP-MS a été utilisé pour déterminer la taille du noyau, la distribution de taille et la concentration en nombre de particules, ainsi que l'hétérogénéité des particules synthétisées en utilisant diverses concentrations de citrate et un rapport de métal. FlFFF-ICP-MS a également été utilisé pour observer la taille hydrodynamique et le rapport d'intensité du signal de Ag et Au dans les BNP et donc pour étayer les informations obtenues à partir de SP-ICP-MS. La combinaison des techniques proposées dans des conditions appropriées a permis de surveiller la réaction de détection colorimétrique. Les informations supplémentaires du fractogramme fournies par FlFFF-ICP-MS ont également été utiles pour comprendre l'agrégation des BNP due au complexe [Co(II)(en)3]2+ autour de la surface des BNP. En outre, par rapport à la détection colorimétrique classique, la limite de détection (LOD) pour la détection des ions Co2+ a été réduite de 20 fois, du niveau ppb au niveau ppt
The research focuses on an analytical method development using chromatography coupled to mass spectrometry for the analysis of low molecular weight iron complexes. In the second part, the study explores the utilization of bimetallic nanoparticles for Co2+ detection.In the first part, a method using liquid chromatography with two detector mass spectrometry, i.e., electrospray high-resolution accurate mass (HRAM) mass spectrometry (MS) and inductively coupled mass spectrometry (ICP-MS), was developed for the analysis of low molecular weight iron (Fe) complexes, called ‘siderophores'. The complexity of the samples, their low concentrations, and the lability of the iron complexe were challenges in the development of methods for their identification and quantification. For the sample clean-up, solid phase extraction (SPE) using acidic conditions was developed to purify the samples, followed by evaporation to dryness. The individual 56Fe-siderophore complexes were identified by fast size-exclusion chromatography (FastSEC) - Orbitrap MSn based on the exact molecular mass (+ 1 ppm) and MS2. Their capability of exchanging the natural 56Fe with the spiked 58Fe was demonstrated by SEC with ICP-MS and ESI-MS detection. The method was applied to the analysis of peat collected in the Eastern part of the French Pyrenean mountains. Nineteen siderophores belonging to four different classes were presumptively identified and quantified. The results were compared with ICP-MS detection of iron and matching of the sum of the moles of iron complexes determined by the isotopic- ESI-MS within each peak as eluted from the fastSEC column.In the second part, a method using inductively coupled plasma mass spectrometry in the single particle mode and the conventional mode coupled to a flow field flow fractionation was developed to select suitable conditions for the synthesis of Ag-Au bimetallic nanoparticles and to monitor the colorimetric changes due to aggregations. Ag-Au BNPs, synthesized by using citrate reduction of Ag and Au ions, were used as sensors for the detection of Co2+. To better understand the colorimetric sensing of Co2+ using the Ag-Au BNPs, various mixtures were studied, viz. (i) only Ag-Au BNPs; (ii) Ag-Au BNPs with thiosulfate; (iii) Ag-Au BNPs with thiosulfate and ethylenediamine; and (iv) Ag-Au BNPs with thiosulfate, Co2+ and ethylenediamine. SP-ICP-MS was used to determine the core size, size distribution, and number concentration, as well as the heterogeneity of the particles synthesized by using various citrate concentrations and metal ratios. Fl-FFF-ICP-MS was also used to observe the hydrodynamic size and the Ag: Au signal intensity ratio of the BNPs to support information obtained from the SP-ICP-MS. The combination of the proposed techniques has been applied to monitor the reaction during colorimetric sensing. Additional information from fractograms provided by Fl-FFF-ICP-MS was also useful for the understanding of the aggregation of BNPs arising from the [Co(II)(en)3]2+ complex surrounding the surface of the BNPs. Furthermore, when compared to colorimetric sensing, the limit of detection for Co2+ ion, using the BNPs and SP-ICP-MS, were 20-fold lower, decreasing from ppb to ppt levels
10

Béjaud, Romuald. "Formation et extension de macles de déformation dans des nanostructures cfc : simulations numériques." Thesis, Poitiers, 2017. http://www.theses.fr/2017POIT2318.

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Abstract:
Depuis quelques dizaines d'années, l'élaboration de matériaux nanostructurés tend de plus en plus à se développer. En effet, ces matériaux présentent souvent des propriétés intéressantes et en particulier des propriétés mécaniques surprenantes vis-à-vis de leurs homologues sous forme massive. Les métaux nano-maclés ou nano-lamellaires par exemple, sont connus pour avoir une bonne résistance mécanique, une bonne stabilité thermique et une excellente résistance aux radiations. Au fur et à mesure que l'espacement entre les interfaces diminue, leur densité augmente de manière significative et les propriétés macroscopiques du matériau sont de plus en plus dépendantes des interactions défaut-interface. Dans ce contexte, nous avons étudié, via des simulations atomistiques, la formation de macles de déformation et les mécanismes d'interaction d'une macle nouvellement formée avec une interface préexistante (un joint de macle ou une interface entre 2 métaux), pour une configuration modèle de film mince auto-supporté. Des premiers résultats montrent l'influence de marches de surface sur le maclage, pour un cas modèle sans interface. Puis nous avons identifié un mécanisme inédit aboutissant à la formation d'une dislocation de Lomer suite à l’interaction d'une macle en formation avec un joint de macle préexistant. En faisant varier la densité de défauts de surface, nous montrons l'influence particulière d'un joint de macle sur la taille et le nombre de macles formées. Enfin, pour les systèmes bimétalliques Cu/Ag, nos résultats mettent en évidence le rôle des dislocations d'épitaxie (à l'interface) dans la nucléation et l'extension des macles ainsi qu'une influence directe du type d'interface considéré sur la propagation de ces macles
For several decades, the elaboration of nano-structured materials tends to develop more and more. Indeed, these materials often show interesting properties, and in particular surprising mechanical properties when compared to their bulk counterparts. For example, nano-twinned or nano-layered metals are known to have ultra-high mechanical strength, good thermal stability, and very good radiation resistance. As the interface spacing decreases to the nanometer-scale, the density of interfaces increases significantly and subsequently the macroscopic properties become largely governed by the interface-defect interactions. In that context, we have studied deformation twin formation and mechanisms of interaction between a new formed twin and a preexisting interface (a twin boundary or a bimetallic interface), using atomistic simulations and a thin film model configuration. First results show the influence of surface steps on mechanical twinning, for a model system without interface. Then we identify a new mechanism leading to the formation of a Lomer dislocation, following the interaction of a newly formed twin and a preexisting twin boundary. By varying the density of surface defects, we show the particular influence of a preexisting twin boundary on twin size and number. Finally, for the Cu/Ag bimetallic system, our results highlight the role of epitaxial dislocations (at the interface) in twin nucleation and extension as well as a direct influence of the interface type in twin propagation
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Book chapters on the topic "Bimetallic nano":

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Perera, D. H. A. G. K., J. P. Usliyanage, U. A. D. Y. S. Perera, S. A. K. K. Samaraweera, and G. Thiripuranathar. "Green Synthesized Bimetallic Nanomaterials for Bioenergy Applications." In Green Nano Solution for Bioenergy Production Enhancement, 19–49. Singapore: Springer Nature Singapore, 2022. http://dx.doi.org/10.1007/978-981-16-9356-4_2.

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Liu, Wei, and Qionghua Zhou. "Synthesis of Silver Plating Nano-copper Bimetallic Powders." In Supplemental Proceedings, 539–46. Hoboken, NJ, USA: John Wiley & Sons, Inc., 2011. http://dx.doi.org/10.1002/9781118062111.ch61.

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Liu, Zhongyi, Shouchang Liu, and Zhongjun Li. "Third-Generation Catalyst of Benzene Selective Hydrogenation to Cyclohexene—Ru–M (Zn, Mn, Fe, La, Ce) Nano-bimetallic System." In Catalytic Technology for Selective Hydrogenation of Benzene to Cyclohexene, 105–68. Singapore: Springer Singapore, 2020. http://dx.doi.org/10.1007/978-981-15-6411-6_5.

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Gjervan, T., M. Rønning, R. Prestvik, B. Tøtdal, C. E. Lyman, and A. Holmen. "Bimetallic nano-particle formation in the Pt-Re reforming catalysts revealed by STEM/EDX, XANES/EXAFS and chemical characterization techniques. Effects of water and chlorine." In Studies in Surface Science and Catalysis, 3189–94. Elsevier, 2000. http://dx.doi.org/10.1016/s0167-2991(00)80513-3.

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Conference papers on the topic "Bimetallic nano":

1

Smelova, Ekaterina M., Ivan I. Sitnikov, Vladimir S. Zelensky, Kseniya M. Tsysar, Valery G. Andreev, Vladimir A. Vdovin, and Alexander M. Saletsky. "Mechanical properties of bimetallic one-dimensional structures." In The International Conference on Micro- and Nano-Electronics 2016, edited by Vladimir F. Lukichev and Konstantin V. Rudenko. SPIE, 2016. http://dx.doi.org/10.1117/12.2267129.

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Terekhova, E. N., and O. B. Belskaya. "Synthesis and study of bimetallic catalysts based on carbon-mineral materials derived from sapropel." In NANOSCIENCE AND NANOTECHNOLOGY: NANO-SciTech. AIP Publishing, 2019. http://dx.doi.org/10.1063/1.5122033.

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Lee, Yeon Kyung, Dae Ho Jang, Kyeong-Seok Lee, Won Mok Kim, Jeong-Ok Lim, and Young-Soo Sohn. "Enhancing resolution of a miniaturized surface plasmon resonance sensor using bimetallic-based chip." In Nano-Bio Sensing, Imaging and Spectroscopy, edited by Shin Won Kang, Seung-Han Park, Luke P. Lee, Ki-Bong Song, and Yo Han Choi. SPIE, 2013. http://dx.doi.org/10.1117/12.2018710.

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Huang, Chia-Sheng, Junwei Chung, Yu-Ting Cheng, and Wensyang Hsu. "Thermal Bimetallic Microactuators by Ni and Ni-diamond Nanocomposite." In 2007 2nd IEEE International Conference on Nano/Micro Engineered and Molecular Systems. IEEE, 2007. http://dx.doi.org/10.1109/nems.2007.352048.

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Kim, Yong Hee, Gook Hwa Kim, Ah Young Kim, and Sang-Don Jung. "Multi-electrode arrays modified with bimetallic nanoparticles; electrical performance and neural signal recording." In 2015 IEEE 15th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2015. http://dx.doi.org/10.1109/nano.2015.7388966.

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Puchades, Ivan, and Lynn F. Fuller. "Design and Evaluation of a MEMS Bimetallic Thermal Actuator for Viscosity Measurements." In 2008 17th Biennial University/Government/Industry Micro/Nano Symposium. IEEE, 2008. http://dx.doi.org/10.1109/ugim.2008.31.

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Cao, Sihai, Chuanfei Guo, Yongsheng Wang, Junjie Miao, Zhuwei Zhang, and Qian Liu. "Transparency conversion mechanism and laser induced fast response of bimetallic Bi/In thin film." In Smart Materials, Nano-and Micro-Smart Systems, edited by Jung-Chih Chiao, Alex J. Hariz, David V. Thiel, and Changyi Yang. SPIE, 2008. http://dx.doi.org/10.1117/12.810615.

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Ng, Poh-Keong, Brandon Fisher, Ke-Bin Low, Matthias Bode, and Carmen M. Lilley. "Self assembled bimetallic Ag/Cu-Si nanowires on Si(001) synthesized with e-beam evaporation." In 2012 IEEE 12th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2012. http://dx.doi.org/10.1109/nano.2012.6322114.

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Mansourian, A., M. Nasir, W. Dickson, D. O'Connor, R. McCarron, G. Wurtz, and Anatoly V. Zayats. "Fabrication and effect of annealing on optical properties of single and bimetallic periodic array of different noble metals." In 2012 IEEE 12th International Conference on Nanotechnology (IEEE-NANO). IEEE, 2012. http://dx.doi.org/10.1109/nano.2012.6322234.

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Peng, Jiao, Li Lin, and Jian Ye. "Silver nanocubes-based bimetallic core-shell surface-enhanced Raman scattering nanoprobes for cell imaging." In 2021 IEEE International Conference on Manipulation, Manufacturing and Measurement on the Nanoscale (3M-NANO). IEEE, 2021. http://dx.doi.org/10.1109/3m-nano49087.2021.9599773.

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