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Stabilization of colloidal dispersions in supercritical carbon dioxideDickson, Jasper Lane 28 August 2008 (has links)
Not available / text
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Preparation and characterization of nitrogen doped carbon nanotube electrode materialsMaldonado, Stephen 28 August 2008 (has links)
Not available / text
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Magnetic, thermoelectric, and electronic properties of layered oxides and carbon materialsCaudillo, Roman, 1977- 28 August 2008 (has links)
The structure and physical properties of layered oxides and carbon materials were studied. Two layered carbon materials were studied: carbon nanotubes (CNTs) synthesized by electron irradiation from amorphous carbon in situ in a transmission electron microscope (TEM) and a carbon and silver nanocomposite consisting of graphitic carbon nanospheres encapsulating Ag nanoparticles. In the CNT experiments, the effect of electron irradiation in the TEM is shown to alter drastically their structure and properties, even being able to transform amorphous carbon into a CNT. This suggests a possible alternative synthesis technique for the production of CNTs, in addition to providing a method for tailoring their properties. The structure and magnetic properties of the carbon and silver nanocomposite was characterized with x-ray diffraction, scanning and transmission electron microscopy techniques, and magnetic susceptibility measurements with a superconducting quantum interference device (SQUID) magnetometer. While the sp² bonding gives a grapheme sheet its mechanical properties, the p[subscript pi] electrons are responsible for its electronic and magnetic properties. In a flat graphene sheet the p[subscript pi] electrons are itinerant, but in a narrow p[subscript pi] band. The introduction of curvature to the graphene sheets that encapsulate the Ag nanoparticles is demonstrated to narrow the p[subscript pi] band sufficiently to result in "ferromagnetic" behavior. A model that is able to explain spin localization and ferrimagnetic spin-spin interactions in graphitic materials with positive curvature is presented. Layered oxides from the family of the P2 Na[subscript x]CoO₂ structure were synthesized and their properties studied. Na[subscript x]CoO₂ has a rich phase diagram ranging form a promising Na-rich thermoelectric composition to the hydrated Na-poor composition Na[subscript 0.33]CoO₂· 1.3H₂O that is superconductive. Intermediate to these two Na compositions exists an insulating phase with x [approximately equal to] 0.5 that presents a variety of interesting structural, magnetic, thermoelectric, and electronic behavior. Investigations of Na[subscript x]CoO₂ that probe the role of H₂O in the superconductive Na[subscript 0.33]CoO₂· 1.3H₂O are presented and conclude that H₂O plays a more active role than a passive lattice spacer. The relationship between Na ordering and an interesting magnetic behavior observed with [chi](T) measurements of annealed NaxCoO₂ and Sr[subscript x/2]CoO₂ samples is determined and found to correspond to a (2a x 2a) superstructure. The properties of NaxCoO₂ (x [approximately equal to] 0.5) are reviewed and thermoelectric S(T) measurements are made in order to develop a model that is able to explain the salient features of the NaxCoO₂ (x [approximately equal to] 0.5) phase. / text
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The leaching of vanadium(V) in soil due to the presence of atmospheric carbon dioxide and ammoniaMandiwana, KL, Panichev, N 24 March 2009 (has links)
The natural leaching of vanadium(V) with CO2 from soil-water in the presence of ammonia, a known
precursor to atmospheric aerosols, has been tested by bubbling carbon dioxide through soil suspension
with varying amount of ammonia. It was found that the leaching of V(V) is enhanced in the presence
of ammonia. From the results of the investigation, it could be concluded that atmospheric CO2 in the
presence of ammonia (the only atmospheric gas that increases the pH of soil-water) could naturally leach
V(V) from soil. Furthermore, it was also shown that the presence of (NH4)2CO3 in soil could enhance the
leaching of toxic V(V) species thereby making it bioavailable for both plants and animals.
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Carbon chemistry : the high temperature syntheses and applications of nanotubes and sp-hybridized compoundsMitchell, Daniel Robert, 1971- 05 May 2011 (has links)
Not available / text
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Spectroscopic investigations of aerosol graphitic carbonMcLaine, Charles Raymond January 1980 (has links)
No description available.
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Growth and application of carbon nanotubesZhang, Can January 2010 (has links)
No description available.
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Carbon nanotubes : dispersions, assemblies and compositesShaffer, Milo Sebastian Peter January 1999 (has links)
No description available.
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Carbon based passivation layers for ultra-high voltage Si devicesZhang, Qiuhong January 2011 (has links)
No description available.
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Ab-initio simulations of graphite defects and growth mechanisms of carbon nanotubesLi, Lan January 2006 (has links)
No description available.
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