The Experts below are selected from a list of 360 Experts worldwide ranked by ideXlab platform
Hongming Lin - One of the best experts on this subject based on the ideXlab platform.
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copper oxide brake nanofluid manufactured using arc submerged Nanoparticle Synthesis system
Journal of Alloys and Compounds, 2007Co-Authors: Mujung Kao, Ching-song Jwo, T.t. Tsung, Hongming LinAbstract:This study examines the characteristics of copper-oxide brake nanofluid (CBN) manufactured using the arc-submerged Nanoparticle Synthesis system (ASNSS). Brake fluids containing copper Nanoparticles are developed by melting bulk metal used as the electrode which is submerged in dielectric liquid. Copper is vaporized in brake fluid DOT3, which is used as an insulting liquid, and then rapidly quenched thus nucleating and forming nanocrystalline copper powders. The CBN thus obtained shows higher boiling temperature, higher viscosity and higher conductivity, which are affected by the Synthesis parameters such as cooling liquid temperature and processing current. This study reveals that a home made machine can produce the CBN which higher boiling point to reduce the occurrence of vapor-lock, higher viscosity and higher conductivity thus showing superior performance of copper brake nanofluid.
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fabrication of copper oxide nanofluid using submerged arc Nanoparticle Synthesis system sanss
Journal of Nanoparticle Research, 2005Co-Authors: Tsingtshih Tsung, Liangchia Chen, Hongming LinAbstract:The optimal parameters are found for preparing nanofluid in our submerged arc Nanoparticle Synthesis system (SANSS) using a copper electrode. A suspended copper oxide nanofluid is thus produced at the current of 8.5–10 A, voltage of 220 V, pulse duration of 12 μs, and dielectric liquid temperature of 2°C. The CuO Nanoparticle are characterized by transmission electron microscopy (TEM), field emission scanning electron microscope (FESEM), X-ray diffraction (XRD), electron diffraction pattern (SAD) and electron spectroscopy for chemical analysis (ESCA). The equality volume spherical diameter of the obtained copper oxide particle is 49.1 nm, regular shape and narrow size distribution.
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process development of a novel arc spray Nanoparticle Synthesis system asnss for preparation of a tio2 Nanoparticle suspension
The International Journal of Advanced Manufacturing Technology, 2004Co-Authors: Tsingtshih Tsung, Ho Chang, Liangchia Chen, Hongming Lin, Ming Kun Liu, C.k. LinAbstract:This article presents the development of an innovative technology to manufacture TiO2 Nanoparticles. Manufacturing Nanoparticles is considered as a crucial step towards product and process innovation. In our proposed process, a titanium rod, as the electrode, is melted and vaporised in deionised water, which is used as an insulating liquid. The vaporised metal particles are then rapidly quenched by the designed cooling system, and thus nanocrystalline powders are nucleated and formed. By implementing the system, we have successfully developed the processing equipment of the arc spray Nanoparticle Synthesis system (ASNSS). The experimental results indicate that uniformly distributed and well-controlled TiO2 Nanoparticle size can be manufactured by ASNSS.
Paul D. Beer - One of the best experts on this subject based on the ideXlab platform.
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core shell bimetallic Nanoparticle Synthesis via anion coordination
Nature Chemistry, 2011Co-Authors: Christopher J. Serpell, James Cookson, Dogan Ozkaya, Paul D. BeerAbstract:Bimetallic core@shell Nanoparticles often have properties that are different from those of single-metal or alloy Nanoparticles. Here, a route to such Nanoparticles that binds the second metal to the core surface prior to reduction is described. The unique catalytic properties of the Nanoparticles are demonstrated in the selective production of chloroaniline.
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core shell bimetallic Nanoparticle Synthesis via anion coordination
Nature Chemistry, 2011Co-Authors: Christopher J. Serpell, James Cookson, Dogan Ozkaya, Paul D. BeerAbstract:Core@shell structured bimetallic Nanoparticles are currently of immense interest due to their unique electronic, optical and catalytic properties. However, their Synthesis is non-trivial. We report a new supramolecular route for the Synthesis of core@shell Nanoparticles, based on an anion coordination protocol--the first to function by binding the shell metal to the surface of the pre-formed primary metal core before reduction. The resultant gold/palladium and platinum/palladium core@shell Nanoparticles have been characterized by aberration-corrected scanning transmission electron microscopy (as well as other techniques), giving striking atomic-resolution images of the core@shell architecture, and the unique catalytic properties of the structured Nanoparticles have been demonstrated in a remarkable improvement of the selective production of industrially valuable chloroaniline from chloronitrobenzene.
Sotiris E Pratsinis - One of the best experts on this subject based on the ideXlab platform.
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scale up of Nanoparticle Synthesis by flame spray pyrolysis the high temperature particle residence time
Industrial & Engineering Chemistry Research, 2014Co-Authors: Arto Juhani Grohn, Sotiris E Pratsinis, Antoni Sanchezferrer, Raffaele Mezzenga, Karsten WegnerAbstract:The scale-up of Nanoparticle Synthesis by a versatile flame aerosol technology (flame spray pyrolysis) is investigated numerically and experimentally for production of ZrO2. A three-dimensional computational fluid dynamics model is developed accounting for combustion and particle dynamics by an Eulerian continuum approach coupled with Lagrangian description of multicomponent spray droplet atomization, transport, and evaporation. The model allows the extraction of the high-temperature particle residence time (HTPRT) that is governed by the dispersion gas to precursor liquid mass flow ratio as well as the flame enthalpy content. The HTPRT is shown to control the primary particle and agglomerate size, morphology, and even ZrO2 crystallinity in agreement with experimental data. When the HTPRT is kept constant, the production rate for ZrO2 Nanoparticles could be scaled up from ∼100 to 500 g/h without significantly affecting product particle properties, revealing the HTPRT as a key design parameter for flame ae...
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Scale-up of Nanoparticle Synthesis by Flame Spray Pyrolysis: The High-Temperature Particle Residence Time
2014Co-Authors: Arto J. Gröhn, Sotiris E Pratsinis, Raffaele Mezzenga, Antoni Sánchez-ferrer, Karsten WegnerAbstract:The scale-up of Nanoparticle Synthesis by a versatile flame aerosol technology (flame spray pyrolysis) is investigated numerically and experimentally for production of ZrO2. A three-dimensional computational fluid dynamics model is developed accounting for combustion and particle dynamics by an Eulerian continuum approach coupled with Lagrangian description of multicomponent spray droplet atomization, transport, and evaporation. The model allows the extraction of the high-temperature particle residence time (HTPRT) that is governed by the dispersion gas to precursor liquid mass flow ratio as well as the flame enthalpy content. The HTPRT is shown to control the primary particle and agglomerate size, morphology, and even ZrO2 crystallinity in agreement with experimental data. When the HTPRT is kept constant, the production rate for ZrO2 Nanoparticles could be scaled up from ∼100 to 500 g/h without significantly affecting product particle properties, revealing the HTPRT as a key design parameter for flame aerosol processes
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Nanoparticle Synthesis at high production rates by flame spray pyrolysis
Chemical Engineering Science, 2003Co-Authors: Roger Mueller, Lutz Mädler, Sotiris E PratsinisAbstract:Scaling-up of Nanoparticle Synthesis by the versatile flame spray pyrolysis process at production rates up to 1.1kg/h is investigated. Product silica powder is collected continuously in a baghouse filter unit which is cleaned periodically by air-pressure shocks. The effect of powder production rate, dispersion gas flow rate and precursor (hexamethyldisiloxane, HMDSO) concentration on product particle size, morphology and carbon content is investigated. Droplet size distributions of the cold spray are measured by laser diffraction, while N2 adsorption (BET), transmission electron microscopy and thermogravimetric analysis coupled with a mass spectrometer are employed to characterize the product powder. The product primary particle size was precisely controlled from 10 to 75nm and compared to a well-established vapor-fed flame aerosol reactor.
Dominique Astruc - One of the best experts on this subject based on the ideXlab platform.
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State of the Art in Gold Nanoparticle Synthesis
Coordination Chemistry Reviews, 2012Co-Authors: Pengxiang Zhao, Na Li, Dominique AstrucAbstract:General principles and recent developments in the Synthesis of gold Nanoparticles (AuNPs) are reviewed. The “in situ” Turkevich-Frens and Brust-Schiffrin methods are still major synthetic routes, with citrate and thiolate ligands respectively, that have been improved and extended to macromolecules including biomacromolecules with a large biomedical potential of optical and theranostic applications. Along this line, however, recently developed seed-growth methods have allowed a precise control of AuNP sizes in a broad range and multiple shapes. AuNPs and core@shell bimetallic MAuNPs loosely stabilized by nitrogen and oxygen atoms of embedding polymers and dendrimers and composite solid-state materials containing AuNPs with supports including oxides, carbons, mesoporous materials and molecular organic frameworks (MOFs) have attracted much interest because of their catalytic applications.
Christopher J. Serpell - One of the best experts on this subject based on the ideXlab platform.
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core shell bimetallic Nanoparticle Synthesis via anion coordination
Nature Chemistry, 2011Co-Authors: Christopher J. Serpell, James Cookson, Dogan Ozkaya, Paul D. BeerAbstract:Bimetallic core@shell Nanoparticles often have properties that are different from those of single-metal or alloy Nanoparticles. Here, a route to such Nanoparticles that binds the second metal to the core surface prior to reduction is described. The unique catalytic properties of the Nanoparticles are demonstrated in the selective production of chloroaniline.
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core shell bimetallic Nanoparticle Synthesis via anion coordination
Nature Chemistry, 2011Co-Authors: Christopher J. Serpell, James Cookson, Dogan Ozkaya, Paul D. BeerAbstract:Core@shell structured bimetallic Nanoparticles are currently of immense interest due to their unique electronic, optical and catalytic properties. However, their Synthesis is non-trivial. We report a new supramolecular route for the Synthesis of core@shell Nanoparticles, based on an anion coordination protocol--the first to function by binding the shell metal to the surface of the pre-formed primary metal core before reduction. The resultant gold/palladium and platinum/palladium core@shell Nanoparticles have been characterized by aberration-corrected scanning transmission electron microscopy (as well as other techniques), giving striking atomic-resolution images of the core@shell architecture, and the unique catalytic properties of the structured Nanoparticles have been demonstrated in a remarkable improvement of the selective production of industrially valuable chloroaniline from chloronitrobenzene.
