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DTSTART:19700329T020000
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DTSTART:19701025T030000
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CLASS:PUBLIC
SUMMARY:Flame Synthesis of Nanoscale Oxide- and Carbon-Based Materials
DTSTART;TZID=Europe/Berlin:20150325T160000
DTEND;TZID=Europe/Berlin:20150325T170000
DTSTAMP:20150325T160000Z
LOCATION;ENCODING=QUOTED-PRINTABLE:Campus Campus Duisburg : Seminarraum 2.42, NanoEnergieTechnikZentrum
CONTACT:Prof. Dr. Christof Schulz (IVG - Reaktive Fluide)
DESCRIPTION:Prof. Dr. Christof Schulz (IVG - Reaktive Fluide)
Flame Synthesis of Nanoscale Oxide- and Carbon-Based Materials
Vortrag von Stephen D. Tse, Mechanical and Aerospace Engineering, Rutgers – the State University of New Jersey, zum Thema: "Flame Synthesis of Nanoscale Oxide- and Carbon-Based Materials".

Flame synthesis of materials has demonstrated a history of scalability and offers the potential for high-volume commercial production, at reduced costs. Flame synthesis of ceramic oxide nanoparticles, semiconducting metal-oxide nanostructures, carbon nanotubes, and graphene will be discussed. 
TiO2 nanoparticles are produced from corresponding organometallic vapor precursors using an axisymmetric stagnation-point premixed flat flame impinging on a cooled substrate under uniform electric field application. Using counterflow flames, other nanostructures, such as WO2.9 nanowires, ZnO nanoribbons, and MoO2 nanoplates are synthesized, whereby growth occurs by the vapor-solid mechanism, with local gas-phase temperature and chemical species strategically specified at the substrate for self-synthesis. Finally, carbon nanotubes and graphene are grown on metal substrates at high rates using a novel multiple inverse-diffusion flames synthesis method in open-atmosphere environments. Flame synthesis combined with solution synthesis to produce novel nanostructures will also be discussed. 
Laser-based spectroscopy is utilized to characterize the gas-phase flow fields (e.g. temperature, species concentrations). Additionally, a novel technique of using Raman spectroscopy to diagnose nanoparticle presence and characteristics (in aerosol form) in-situ during synthesis has been applied. This technique serves as a sensitive and reliable way to characterize particle composition and crystallinity (e.g. anatase versus rutile) and delineate the phase conversion of nanoparticles as they evolve in the flow field. Finally, novel low-intensity laser-induced breakdown spectroscopy (LIBS) is employed to conduct an in-situ study on flame synthesis of TiO2 nanoparticles, where only Ti atoms in particle phase are excited, with no breakdown emission occurring for gas molecules (e.g. titanium tetraisopropoxide precursor, air). 
Wednesday, 25. March 2015
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