(705e) Two-Step Gas Phase Synthesis of Janus-Like and Core-Shell FexOy-TiO2 Composite Nanoparticles | AIChE

(705e) Two-Step Gas Phase Synthesis of Janus-Like and Core-Shell FexOy-TiO2 Composite Nanoparticles

Authors 

Harra, J. - Presenter, Tampere University of Technology
Aromaa, M., Tampere University of Technology
Suhonen, H., Tampere University of Technology
Nikkanen, J. P., Tampere University of Technology
Honkanen, M., Tampere University of Technology
Heinonen, S., Tampere University of Technology
Levänen, E., Tampere University of Technology


Composite nanoparticles are of a great interest because the properties of several different materials can be combined. In this study, FexOy-TiO2 nanoparticles were synthesized in two steps. Iron oxide and titanium dioxide were chosen because they are known to have magnetic and photocatalytic properties, respectively. FexOy nanoparticles were synthesized using the Liquid Flame Spray technique by feeding a solution of ferrocene dissolved in xylene into a high-temperature H2-O2 flame. The flame-made nanoparticles were collected with an electrostatic precipitator and mixed with titanium(IV) isopropoxide (TTIP) liquid. The mixture was sprayed into a tube furnace where TTIP was thermally decomposed to form TiO2. Both FexOy and FexOy-TiO2 nanopowders were characterized with TEM and XRD. The TEM images show that by altering the process parameters, the structure of the composite nanoparticles can be tailored between Janus-like and core-shell particles consisting of an agglomerated FexOy particle attached to or inside a spherical TiO2 particle, respectively. Mixing nanopowder into precursor liquid that is thermally decomposable is a versatile and easy method to synthesize composite nanopowders which are formed of particles containing two or more different materials and properties, as demonstrated in this study.
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