Nanotubes Plant-Powerpoint presentation

Nanotubes Plant-Powerpoint presentation - Carbon Nanotubes...

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Carbon Nanotubes Plant Linh Do Sabrina Pepper Ilze Veidemane
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Presentation Outline ± Carbon nanotube history ± Production methods ± Economic Forecast ± HiPCO plant design ± CoMoCat plant design ± Plant Capacity and Location ± Business Plan
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History ± The discovery of nanotubes comes from the Buckyball in 1980 ± Nanotubes discovered in 1991 by S. Iijima (http://www.slb.com)
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Types of CNT’s ± Single wall (SWNT) { single layer wall { diameter 0.7-5 nm ± Multi-wall (MWNT) { concentric tubes { inner diameter: 1.5-15 nm { outer diameter: 2.5-30 nm
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Orientation and Properties All possible structures of SWNTs can be formed from chiral vectors
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Bond Types ± Armchair (conductor) ± Zigzag (semiconductor) ± Chiral (semiconductor)
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Properties ± The chart compares the tensile strength of SWNT's to some common high- strength materials. ± Electrical conductivity is as high as copper ± Thermal conductivity is as high as diamond ± Strength 100 times greater than steel at one sixth the weight
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SWNT Applications Application Diameter (nm) Length ( µ m) Desired Form Lithium batteries 0.7- 1.4 5. -40. Defects Chemical sensors 1.4 - 2.3 20. - 40. Higly aligned carbon nanotubes Flat panel displays 1.0 - 5.0 5. - 100 Highly ordered arrays on substrate Hydrogen storage 1.85 - 5.0 10.-50 Produced by Ar and H 2 arc method AFM tips 1.0 - 2.0 18. - 35. Grown directly by CVD onto Si tips (can be attached later)
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Production Methods ± Arc discharge ± Laser ablation ± Chemical Vapor Deposition (CVD)
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Arc-discharge apparatus Arc Arc Discharge Process Discharge Process ± High-purity graphite rods under a helium atmosphere. ± T > 3000 o C ± 20 to 40 V at a current in the range of 50 to 100 A ± Gap between the rods approximately 1 mm or less ± Lots of impurities: graphite, amorphous carbon, fullerenes
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Laser ablation apparatus Laser Ablation Process ± Temperature 1200 o C ± Pressure 500 Torr ± Cu collector for carbon clusters ± MWNT synthesized in pure graphite ± SWNT synthesized when Co, Ni, Fe, Y are used ± Laminar flow ± Fewer side products than Arc discharge
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Gas phase process No substrate FROM CARBON MONOXIDE (HiPCO ® ) (CoMoCat ® ) CVD Chemical Vapor Deposition
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Growth Mechanism
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CVD in Gas Phase Process ± Catalysts: Fe, Ni, Co, or alloys of the three metals ± Hydrocarbons: CH 4 , C 2 H 2 , etc. ± Temperature: First furnace 1050 o C Second furnace: 750 o C ± Produce large amounts of MTWNs
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HiPCO ® PROCESS CVD of Carbon Monoxide ± Thermal decomposition of iron pentacarbonyl in a flow of CO ± Temperature ~1050 o C ± Pressure ~10 atm Fe(CO) 5 2CO(g) C(s) + CO2(g)
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CoMoCat ® PROCESS CVD of Carbon Monoxide ± Disproportionation of CO over a Co/Mo, silica supported catalyst ± Temperatures 700-950 o C ± Pressure (1–10 atm) 2CO(g) C(s) + CO 2 (g) Co : Mo recirculating pump
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Comparison of Nanotube Production Technology Conductor CNTs Continuous or Semi Batch.
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This note was uploaded on 08/31/2011 for the course CHE 4273 taught by Professor Staff during the Spring '10 term at Oklahoma State.

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Nanotubes Plant-Powerpoint presentation - Carbon Nanotubes...

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