موقعك الحالي:صفحة رئيسية>المنتجات
2009-3-25 The fluidized bed jet grinding of CNTs with a nozzle/target configuration is a new idea proposed here. The jet grinding study of CNTs in a dedicated grinding unit (Alpine jet mill) was presented in another study . Since CNTs could be successfully ground with air jets, the objective of this study was to investigate the jet grinding of CNTs in a fluidized bed.
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The fluidized bed jet grinding of carbon nanotubes with a nozzle/target configuration Author links open overlay panel Carole E. Baddour a Cedric L. Briens b Serge Bordere c
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Abstract Carbon nanotubes (CNTs) are a promising material with excellent mechanical, electrical, chemical and thermal properties. Industries producing large quantities of CNTs typically use the fluidized bed chemical vapour deposition (CVD) technique. However, this technique presents certain challenges related to the size of CNT bundles. These challenges include agglomeration in the fluidized ...
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2020-10-13 Characteristics of original carbon nanotubes To make the carbon nanotubes, catalyst was made by deposition on alumina support particles. The catalyst particles had a loose bulk density of about 1100 kg/m3. The CNTs, which grew on the catalyst particles in the fluidized bed reactor, formed grains with a much lower bulk density of about 100 kg/m3. Figure 1 shows
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A new, two-parameter grinding model shows that the primary grinding mechanism is fragmentation for the jet mill and erosion in the fluidized bed column. The main challenges for the development of an industrial process for carbon nanotubes (CNTs) synthesis are the formation of
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2008-11-1 Jet grinding is a scalable process and does not contaminate the product. In addition, no additional stages are required if jet grinding is achieved in a fluidized bed during CNT synthesis. Conversely, the exfoliation of carbon nanotube bundles and the removal of most catalysts are not achieved by jet grinding.
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Carbon nanotube is one of the most talked about materials in recent years due to its unique properties and potential applications in different fields. Out of different techniques, catalytic chemical vapour deposition in a fluidized bed is the most promising technique for bulk production of this exotic material. The objectives of this review are to bring out the science and technology behind ...
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2021-7-12 Baddour, C. E., Briens, C., Bordere, S., Anglerot, D. and Gaillard, P. (2009) The fluidized bed grinding of carbon nanotubes with a nozzle/target configuration, Powder Technology, Vol. 190, Issue 3, 372-384. doi: https://doi.org/10.1016/j.powtec.2008.08.016
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The project objective was to investigate the feasibility of CNT grinding with two arrangements. Experiments showed that a commercial jet mill can meet product quality requirements. However, in-situ grinding of CNTs, within the fluidized bed reactor, would improve both the
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The goal of this study was to determine whether the nanotubes could be ground with air jets using a commercial jet mill and apply a two-parameter model to describe the grinding process. The present study has indicated that air-jet grinding of CNTs is feasible with a typical commercial jet mill.
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2020-10-13 Fluidized bed attritor For this study, a non-reacting, batch system was used. The fluidized bed column was 5.4 cm in diameter. In all experiments, 12 g of CNTs were used, for a bed height to diameter ratio of about 1. A vertical grinding jet was used, with a 0.2 mm diameter nozzle that formed a vertical gas jet that picked up the fluidized grains,
Read MoreA new, two-parameter grinding model shows that the primary grinding mechanism is fragmentation for the jet mill and erosion in the fluidized bed column. The main challenges for the development of an industrial process for carbon nanotubes (CNTs) synthesis are the formation of
Read MoreThe goal of this study was to determine whether the nanotubes could be ground with air jets using a commercial jet mill and apply a two-parameter model to describe the grinding process. The present study has indicated that air-jet grinding of CNTs is feasible with a typical commercial jet mill.
Read MoreThe project objective was to investigate the feasibility of CNT grinding with two arrangements. Experiments showed that a commercial jet mill can meet product quality requirements. However, in-situ grinding of CNTs, within the fluidized bed reactor, would improve both the
Read MoreCarbon nanotube is one of the most talked about materials in recent years due to its unique properties and potential applications in different fields. Out of different techniques, catalytic chemical vapour deposition in a fluidized bed is the most promising technique for bulk production of this exotic material. The objectives of this review are to bring out the science and technology behind ...
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2007-7-1 Jet milling can also be used to grind carbon nanotubes (Briens et al., 2007). Jet attritors are also applied in fluidized bed processes such as fluidized bed coal combustion, where they grind the sorbent particles to maximize the adsorption efficiency of sulfur oxides, and fluid coking.
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Discovered in 1991, carbon nanotubes (CNTs) have reached the forefront of many industrial research projects. Carbon nanotubes are tubular carbon molecules with remarkable mechanical, chemical, thermal and electrical properties, which make them useful in various applications. This paper reviews three methods of synthesizing the nanomaterial, namely arc-discharge, laser-ablation and fixed bed ...
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2021-7-12 Aside from time in the southwest of France where she completed her Master’s research at Groupement de Recherche de Lacq Arkema’s research center, Dr. Baddour lived in Canada where she completed her studies and started her career
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2019-10-16 When fluidized, a bed of solid particles will behave as a fluid, like a liquid or gas. Like water in a bucket: the bed will conform to the volume of the chamber, its surface remaining perpendicular to gravity; objects with a lower density than the bed density will float on its surface, bobbing up and down if pushed downwards, while objects with a higher density sink to the bottom of the bed.
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2 天前 Branch Subject Contact Exam. Subject Lectures Tutorials Practicals Credits Pract . Code Code Hours Hours Theory Total. Sess. A: Written Papers. MA 251 A Advanced Engineering 2 - - 2 2 3 100 - 100. Mathematics (EC/ECC/EEE) - II. EC 252 A R.F. Circuits Systems 2 1 - 3 3 3 100 - 100. Electronics Circuits (EC/EEE) –.
Read More2007-7-1 Jet milling can also be used to grind carbon nanotubes (Briens et al., 2007). Jet attritors are also applied in fluidized bed processes such as fluidized bed coal combustion, where they grind the sorbent particles to maximize the adsorption efficiency of sulfur oxides, and fluid coking.
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A fluidized-bed reactor is employed to prepare carbon nanotubes. The carbon nanotubes are characterized by means of SEM and TEM. Using LaCoO3 as catalyst precursor and C2H2 as raw material, We study the influences of various parameters such as reduction temperature, reduction time, reaction temperature and reaction time on the yield and morphology of the nanotubes.
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There is described a fluidized bed jet mill (1) having a grinding chamber (2) wich a peripheral wall (3), a base (4), and a central axis (51 ). An impact tagret (12) is mounted within the grinding chamber (2) and centered on the chamber's central axis (51). Multiple sources (10, 11) of high velocity gas are mounted in the peripheral wall (3) of the grinding chamber (2), are arrayed ...
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fluidized bed grinding chamber central axis Prior art date 1990-11-27 Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.) Expired - Lifetime Application number EP19910310858 Other languages German (de ...
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The apparatus disclosed relates to a fluidized bed jet mill having a grinding chamber which is free of fixtures which is provided in its bottom region with a nozzle with a gas jet emerging vertically upward. The jet mill is configured such that when the grinding chamber is filled with the material to be reduced in size, material and gas emerge from the bed of material as a column of little speed.
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PURPOSE: To improve the grinding efficiency of a fluidized head jet mill by arranging an impact target on the central axis of a grinding chamber and injecting high velocity gas toward this target from the peripheral wall of the grinding chamber. CONSTITUTION: The grinding chamber 2 of a mill 1 is enclosed by the peripheral wall 3 and a base 4 and the impact target 13 of a spherical shape is ...
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The method and apparatus for impact pulverization by directing at least one high-velocity gas or vapor jet exiting from a nozzle into a fluidized bed of milling material, wherein the gas or vapor jet is jointly accelerated with a portion of the milling material and thereafter directed into the fluidized bed
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The result is a completely new grinding method. Until now air jet milling, due to its energy consumption, was only cost efficient when applied to high value products. Now many other materials can be economically processed in our fluidized bed jet mills. Economy is only one of the distinguishing features of our new e-Jet ® System (patent ...
Read MoreDiscovered in 1991, carbon nanotubes (CNTs) have reached the forefront of many industrial research projects. Carbon nanotubes are tubular carbon molecules with remarkable mechanical, chemical, thermal and electrical properties, which make them useful in various applications. This paper reviews three methods of synthesizing the nanomaterial, namely arc-discharge, laser-ablation and fixed bed ...
Read More
2012-12-7 The synthesis of new materials containing multi-walled carbon nanotubes (MWCNTs) and the microstructure of alumina particles were investigated and characterized. The MWCNTs and alumina particles were ground under both the dry and wet conditions with various rotation speeds (200–400 r/min) in planetary ball milling machine, and their combination characteristics were described.
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الصين -تشنغ تشو -المنطقة الوطنية للتنمية الصناعية للتكنولوجيا المتطورة، جادة العلوم رقم 169.
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