the fluidized bed jet grinding of carbon nanotubes with a

the fluidized bed jet grinding of carbon nanotubes with a

The fluidized bed jet grinding of carbon nanotubes with a ...

Mar 25, 2009  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 ...

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An Investigation of Carbon Nanotube Jet Grinding

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,

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An investigation of carbon nanotube jet grinding ...

Nov 01, 2008  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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An investigation of carbon nanotube jet grinding ...

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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Fluidized bed synthesis of carbon nanotubes – A review ...

Jul 15, 2011  Reaction and growth mechanism for carbon nanotubes. In the fluidized bed reactor the substrate (e.g. alumina, silica, magnesia, carbon black etc. containing catalyst like Fe, Ni, Co or mixture) on which the carbon nanotubes grow, needs to be fluidized using a carrier gas (like nitrogen, argon etc.) initially till the temperature of synthesis is ...

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Synthesis of carbon nanotubes using fluidized bed technology

Large scale production of carbon nanotubes in a nano-agglomerate fluidized-bed reactor (NAFBR) (Wang et al., 2002) [12] showed that carbon nanotubes produced by catalytic chemical vapour deposition (CCVD) can be formed into loose agglomerates that can be fluidized

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An Investigation of Carbon Nanotube Jet Grinding - CORE

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

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Fluidized bed synthesis of carbon nanotubes: Reaction ...

Apr 26, 2014  Carbon nanotubes have been synthesized from acetylene and methane in a fluidized bed by using ferrocene as the catalyst dispersed over carbon black support material. The agglomerate size of carbon black, loading of catalyst, total gas flow rate, partial pressure of reactant gas, temperature of synthesis, and time of synthesis have been varied ...

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Grinding characteristic of multi-walled carbon nanotubes ...

Dec 07, 2012  高达10%返现  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

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"An Investigation of Carbon Nanotube Jet Grinding" by ...

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 agglomerates and the control of their size distribution.

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Particle attrition mechanism with a sonic gas jet injected ...

Jul 01, 2007  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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CiteSeerX — An investigation of carbon nanotube jet grinding

However, in-situ grinding of CNTs, within the fluidized bed reactor, would improve both the productivity and quality of CNTs. 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.

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Study of High Velocity Attrition Nozzles in a Fluidized Bed

Fluidized bed jet attritors use high velocity gas jets to grind fluidized particles. Jet ... describe jet milling of carbon nanotubes. However, as most other models, it applies ... Some particles are never exposed to the attrition jet during the grinding process, even if the mixing in the fluidized bed is perfect. Therefore, a parameter β, was ...

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Catalytic Production of Carbon Nanotubes by Fluidized‐Bed ...

The large scale production of carbon nanotubes (CNTs) is a major issue for their use in industry. Among the different techniques used for their synthesis, catalytic (C)CVD in fluidized‐bed reactors appears one of the most promising.

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EP0488637B1 - A fluidized bed jet mill - Google Patents

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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CGS Fluidized Bed Jet Mill - NETZSCH Grinding Dispersing

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 ...

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US Patent Application for Carbon Nanotube Based Pastes ...

Jan 13, 2011  The carbon nanotubes produced using a fluidized bed with the carbon nanotube agglomerates are highly crystalline, having a purity of greater than 96%. Forming nano-agglomerates is a critical step for growth of carbon nanotubes in a fluidized-bed reactor.

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Grinding characteristic of multi-walled carbon nanotubes ...

Dec 07, 2012  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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Carbon nanotubes: properties, synthesis, purification, and ...

Aug 13, 2014  Introduction. Carbon is the chemical element with atomic number 6 and has six electrons which occupy 1 s 2, 2 s 2, and 2p 2 atomic orbital. It can hybridize in sp, sp 2, or sp 3 forms. Discoveries of very constant nanometer size sp 2 carbon bonded materials such as graphene [], fullerenes [], and carbon nanotubes [] have encouraged to make inquiries in this field.

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Fluidized Bed Opposed Jet Mills AFG, AFG-R ...

Hosokawa introduced the fluidized bed opposed jet mill onto the market in 1981, revolutionizing the sector of jet milling. Since then, almost 1000 systems with fluidized bed opposed jet mills have been delivered for an enormous variety of different applications, and Hosokawa's fund of know-how in this field is correspondingly immense.

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US7622059B2 - Method for synthesis of carbon nanotubes ...

The invention relates to a method for synthesis of carbon nanotubes of the highest carbon purity by the process of vapour phase chemical deposition. The nanotubes produced can be used to advantage in all know applications of carbon nanotubes.

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US20110121241A1 - Process for Producing Carbon Nanotubes ...

US20110121241A1 US13/017,594 US201113017594A US2011121241A1 US 20110121241 A1 US20110121241 A1 US 20110121241A1 US 201113017594 A US201113017594 A US 201113017594A US 2011121241 A

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US20120298782A1 - Jet mill and method for operation of a ...

A method for the operation of a jet mill with an integrated dynamic air classifier, wherein particles are fed as grinding stock into a grinding chamber of the jet mill and are ground there into ultra-fine particles by grinding, in that superheated steam or technical gases is/are used as working stock, wherein at least one surface-active additive is fed to the grinding stock for stabilization ...

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CiteSeerX — An investigation of carbon nanotube jet grinding

However, in-situ grinding of CNTs, within the fluidized bed reactor, would improve both the productivity and quality of CNTs. 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.

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EP0488637B1 - A fluidized bed jet mill - Google Patents

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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US7622059B2 - Method for synthesis of carbon nanotubes ...

The invention relates to a method for synthesis of carbon nanotubes of the highest carbon purity by the process of vapour phase chemical deposition. The nanotubes produced can be used to advantage in all know applications of carbon nanotubes.

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A STUDY ON FINE GRINDING PROCESS IN JET MILL

A STUDY ON ULTRA FINE GRINDING OF SILICA AND TALC . IN OPPOSED FLUIDIZED BED JET MILL . by . SAMAYAMUTTHIRIAN @ THILAGAN PALANIANDY . Thesis submitted in fulfillment of the . Requirements for the degree . Of Doctor of Philosophy . JANUARY 2008

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Fluidized Bed Opposed Jet Mills AFG, AFG-R ...

Hosokawa introduced the fluidized bed opposed jet mill onto the market in 1981, revolutionizing the sector of jet milling. Since then, almost 1000 systems with fluidized bed opposed jet mills have been delivered for an enormous variety of different applications, and Hosokawa's fund of know-how in this field is correspondingly immense.

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US8540902B2 - Carbon nanotube based pastes - Google Patents

Carbon-nanotube based pastes and methods for making and using the same are disclosed. Carbon nanotubes are dispersed via milling; resultant paste has Hegman scale of greater than 7. The pastes can be used as electro-conductivity enhancement in electronic devices such as batteries, capacitors, electrodes or other devices needing high conductivity paste.

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US Patent Application for Carbon Nanotube Based Pastes ...

Jan 13, 2011  The carbon nanotubes produced using a fluidized bed with the carbon nanotube agglomerates are highly crystalline, having a purity of greater than 96%. Forming nano-agglomerates is a critical step for growth of carbon nanotubes in a fluidized-bed reactor.

Read More
Carbon nanotubes: properties, synthesis, purification, and ...

Aug 13, 2014  Introduction. Carbon is the chemical element with atomic number 6 and has six electrons which occupy 1 s 2, 2 s 2, and 2p 2 atomic orbital. It can hybridize in sp, sp 2, or sp 3 forms. Discoveries of very constant nanometer size sp 2 carbon bonded materials such as graphene [], fullerenes [], and carbon nanotubes [] have encouraged to make inquiries in this field.

Read More
US20120298782A1 - Jet mill and method for operation of a ...

A method for the operation of a jet mill with an integrated dynamic air classifier, wherein particles are fed as grinding stock into a grinding chamber of the jet mill and are ground there into ultra-fine particles by grinding, in that superheated steam or technical gases is/are used as working stock, wherein at least one surface-active additive is fed to the grinding stock for stabilization ...

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Fluidized Bed Opposed Jet Mill AFG-CR HOSOKAWAMICRON ...

The classifying wheel is designed on basis of the forced and the semifree vortex theory, resulting with sub-micron classification. Combining with opposed jet mill technology, sub-micron grinding is achieved. CR wheels are made by ceramics for material contamination free

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Fluidization - WikiMili, The Free Encyclopedia

Oct 16, 2019  ↑ Carole Baddour, Cedric Briens, Serge Bodere, Didier Anglerot, Patrice Gaillard, 2008, "The fluidized bed jet grinding of carbon nanotubes with a nozzle/target configuration", Powder Technology, Volume 190, Issue 3, 25 March 2009, Pages 372-38

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Alpine AFG Fluidized Bed Opposed Jet Mill Hosokawa ...

The Alpine AFG Fluidized Bed Jet Mill is suitable for fine and ultrafine size reduction of any material up to a Moh's hardness of 10 that can be fluidized by the expanded compressed gas in the grinding chamber. The addition of an internal forced vortex classifier is capable of controlling particle top sizes (D97) as low as 3 microns.

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Dry Grinding - NETZSCH Grinding Dispersing

The s-Jet ® System (patent pending) is a new innovation in a line of consistent developments being made in the area of air jet milling. Final finenesses in the submicron range (example: d 50 0.2 µm) can now be achieved with fluidized bed jet mills. As opposed to conventional dry grinding processes with fluidized bed jet mills, the s-Jet ® System uses superheated steam as its milling gas.

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Dry Grinding - NETZSCH Grinding Dispersing

The s-Jet ® System (patent pending) is a new innovation in a line of consistent developments being made in the area of air jet milling. Final finenesses in the submicron range (example: d 50 0.2 µm) can now be achieved with fluidized bed jet mills. As opposed to conventional dry grinding processes with fluidized bed jet mills, the s-Jet ® System uses superheated steam as its milling gas.

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