Opposed flow oxy-flame synthesis of carbon and oxide nanostructures on molybdenum probes |
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| Authors: | Wilson Merchan-Merchan Alexei V Saveliev Vu Nguyen |
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| Institution: | aSchool of Aerospace and Mechanical Engineering, University of Oklahoma, 856 Asp Avenue, Felgar Hall, Room 208, Norman, OK 73019, USA;bDepartment of Mechanical & Aerospace Engineering, North Carolina State University, Raleigh, NC 27695, USA |
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| Abstract: | The formation of carbon and metal-oxide nanostructures on molybdenum probes inserted in a counter-flow oxy-fuel flame is studied experimentally. Flame position and probe diameter were varied to achieve a controlled growth of carbon and metal-oxide nanostructures at fuel and oxygen-rich flame zones. Mo probes of 1-mm diameter were introduced in the flame at various heights, starting from the upper hydrocarbon-rich zone on the fuel side of the flame to the oxygen-rich zone on the oxidizer side. High density layers of carbon nanocoils (CNCs) and filamentous structures containing ribbon shapes and straight nanofibers were formed in the upper hydrocarbon-rich flame zone. The formation of carbon micro-trees was observed on the fuel side closer to the flame front. The structures formed in the oxidizer part of the flame were composed of molybdenum-oxides. MoO2 micron-sized channel structures were formed on the oxidizer side in the vicinity of the flame front. The micro-channels had rectangular and square-framed shapes; they were completely hollow, closed, and semi-open with a small circular cavity at their tips. The application of probes with diameters of 0.75 and 0.25 mm resulted in the formation of spectacular 3-D structures with unique and distinct morphologies. |
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| Keywords: | Combustion synthesis Carbon nanocoils Carbon nanofibers Metal-oxide whiskers |
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