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Full-Text Articles in Engineering
Process For The Continuous Production Of Aligned Carbon Nanotubes, David N. Jacques, Rodney Andrews
Process For The Continuous Production Of Aligned Carbon Nanotubes, David N. Jacques, Rodney Andrews
Center for Applied Energy Research Faculty Patents
Novel methods and apparati for continuous production of aligned carbon nanotubes are disclosed. In one aspect, the method comprises dispersion of a metal catalyst in a liquid hydrocarbon to form a feed solution, and volatilizing the feed solution in a reactor through which a substrate is continuously passed to allow growth of nanotubes thereon. In another aspect, the apparatus comprises a reactor, a tube-within-a-tube injector, and a conveyor belt for passing a substrate through the reactor. The present invention further discloses a method for restricting the external diameter of carbon nanotubes produced thereby comprising passing the feed solution through injector …
A Polyhedral Model For Carbon Nanotubes, Barry Cox, James Hill
A Polyhedral Model For Carbon Nanotubes, Barry Cox, James Hill
Faculty of Engineering and Information Sciences - Papers: Part A
A new structural model accounts for the curvature inherent in their cylindrical shape.
Texture Evolution During Annealing Of Warm Rolled Cr-Containing Low Carbon Steels, E V. Pereloma, Azdiar A. Gazder, John J. Jonas, Chris H. J. Davies
Texture Evolution During Annealing Of Warm Rolled Cr-Containing Low Carbon Steels, E V. Pereloma, Azdiar A. Gazder, John J. Jonas, Chris H. J. Davies
Faculty of Engineering - Papers (Archive)
Two low carbon steels alloyed with 0.48wt% and 0.78wt% Cr were warm rolled to 65% reduction at 640°C. Annealing was carried out at 710°C to achieve a range of recrystallized volume fractions up to 100%. Texture analysis was performed by X-ray diffraction and Electron Back Scattering Diffraction. During the initial stages of recrystallization, more recrystallized grains nucleated at shear bands than at grain boundaries in the 0.48wt%Cr steel, whereas this was not the case in the 0.78wt%Cr steel. This is associated with a decrease in the propensity to form shear bands due to the lower amount of C in solid …
Impurity Mediated In Absorption Continuum In Single Walled Carbon Nanotubes, Chao Zhang, J. C. Cao, Xiao-Bing Guo, Feng T. Liu
Impurity Mediated In Absorption Continuum In Single Walled Carbon Nanotubes, Chao Zhang, J. C. Cao, Xiao-Bing Guo, Feng T. Liu
Faculty of Engineering - Papers (Archive)
The authors demonstrate that in single-walled carbon nanotubes, a weak impurity potential can leadto a strong above-gap absorption continuum. The total absorption is enhanced due to the intrabandand indirect transitions, as well as plasmon excitations, which are forbidden in perfect nanotubes.Such impurity induced absorption is strongly dependent on the size and chirality of the tube.
Amorphous Carbon-Coated Silicon Nanocomposites: A Low-Temperature Synthesis Via Spray Pyrolysis And Their Application As High-Capacity Anodes For Lithium-Ion Batteries, See How Ng, Jiazhao Wang, David Wexler, Sau Yen Chew, Hua-Kun Liu
Amorphous Carbon-Coated Silicon Nanocomposites: A Low-Temperature Synthesis Via Spray Pyrolysis And Their Application As High-Capacity Anodes For Lithium-Ion Batteries, See How Ng, Jiazhao Wang, David Wexler, Sau Yen Chew, Hua-Kun Liu
Faculty of Engineering - Papers (Archive)
This article introduces an effective, inexpensive, and industrially oriented approach to produce carbon-coated Si nanocomposites as high-capacity anode materials for use in rechargeable lithium-ion batteries. Initially, nanosized Si particles (nm) were mixed in a citric acid/ethanol solution via ultrasonication. This mixture was further spray-pyrolyzed in air at low processing temperature (300-500 C), resulting in a homogeneous layer of carbon coating on the surface of the spheroidal Si nanoparticles. The effects of the processing temperature on the amorphous carbon content, the thickness of the carbon-coating layer, and the homogeneity of the carbon coating were studied in detail. These parameters strongly influenced …
Continuous Unidirectional Carbon Fibre-Reinforced Concrete Beams, Manouch Salehi, Muhammad N. S Hadi
Continuous Unidirectional Carbon Fibre-Reinforced Concrete Beams, Manouch Salehi, Muhammad N. S Hadi
Faculty of Engineering - Papers (Archive)
This paper reports a set of experimental results for continuous unidirectional carbonfibre-reinforced concrete beams. The fibers are embedded at different layers in thetension side of the beam below the neutral axis. All together nine concrete beamswere constructed and tested, three of which contained no reinforcement. The carbonfibre-reinforced concrete beam load-deflection results are presented graphically forthree beams with one-layer, one with two-layers and two with four-layers ofcontinuous unidirectional fibres. The maximum deflections of the reinforced beamsare compared with those of plain concrete beams.
Polyaniline And Polyaniline-Carbon Nanotube Composite Fibres As Battery Materials In Ionic Liquid Electrolyte, Caiyun Y. Wang, Vahid Mottaghitalab, Chee O. Too, Geoffrey M. Spinks, G G. Wallace
Polyaniline And Polyaniline-Carbon Nanotube Composite Fibres As Battery Materials In Ionic Liquid Electrolyte, Caiyun Y. Wang, Vahid Mottaghitalab, Chee O. Too, Geoffrey M. Spinks, G G. Wallace
Faculty of Engineering - Papers (Archive)
New battery materials are presented that consist of either a solid polyaniline (PANi) fibre or the same fibre containing carbon nanotubes (CNTs). An ionic liquid ethylmethyl imidazolium bis(trifluoromethanesulfonyl) amide (EMI.TFSA) is used as electrolyte. The electrochemical properties of PANi and PANi/CNT fibres are investigated by means of cyclic voltammetry, a.c. impedance and galvanostatic charge–discharge techniques. A PANi fibre with a CNT content of 0.25 wt.% exhibits a discharge capacity of 12.1 mAh g−1.
Development Of Method For Synthesis Of Pt–Co Cathode Catalysts For Pem Fuel Cells, Xuguang Li, Héctor R. Colón-Mercado, Gang Wu, Jong-Won Lee, Branko N. Popov
Development Of Method For Synthesis Of Pt–Co Cathode Catalysts For Pem Fuel Cells, Xuguang Li, Héctor R. Colón-Mercado, Gang Wu, Jong-Won Lee, Branko N. Popov
Faculty Publications
A procedure was developed to synthesize a platinum–cobalt (Pt–Co) alloy electrocatalyst for oxygen reduction using Co/C composite as a support. The Pt–Co/C catalysts were synthesized through: (i) chemical oxidation of carbon black, (ii) Co deposition on the oxidized carbon using a chelation method, (iii) chemical treatment in an acidic medium to remove excess of Co on the carbon surface, (iv) Pt deposition onto the Co/C support, and (v) postheat treatment to form the Pt–Co alloy catalyst. The synthesized Pt–Co/C catalyst showed improved activity and long-term stability in polymer electrolyte membrane …
Applicability Of Borman Decision Tree Its Management Tool To Other Expressway Systems, Ahmed S. Soliman, Robert Bertram Jacko, Barry K. Partridge
Applicability Of Borman Decision Tree Its Management Tool To Other Expressway Systems, Ahmed S. Soliman, Robert Bertram Jacko, Barry K. Partridge
JTRP Technical Reports
An empirical model called the Traffic Air Quality Model (TAQ) was developed from meteorological and PM2.5 measurements adjacent to the Borman Expressway in Northwest Indiana to estimate PM2.5 road emissions. It concluded that on average a 74% improvement in air quality is expected (based on reduction of mass emitted per mile [g/mi]) when the average Borman speed range is improved from < 30 mph to >50 mph. An additional 39% (on average) improvement in the PM_2.5 emissions on the Borman Expressway was found when traffic flow speeds increased from 55 mi/h to 75 mi/h. The TAQ model was found to perform well when tested …