Affiliation:
1. Korea Advanced Institute of Science and Technology (KAIST)
2. Samsung Electronics Co. Ltd.
Abstract
A pulsed spark-discharge aerosol generator using air as a carrier gas was successfully
applied to the titania nanoparticle production. The titanium vapor evaporated by spark discharge was
subsequently supersaturated and condensed to titania nanoparticles by nucleation and condensation.
The size and concentration of the particles can be controlled easily using air as a carrier gas by altering
the repetition frequency, capacitance, gap distance, and flow rate of the spark-discharge system. TEM
observation shows that the generated particles were aggregates, which primary particle sizes are a few
nanometers. The element composition of the nanoparticles was titanium and the crystal phase was
amorphous. XPS analysis shows that oxidation state of generated particles corresponded to TiO2.
These XPS data indicates that some fraction of the evaporated titanium vapor could be oxidized in an
air atmosphere by the oxidation with oxygen. However, enough time for crystallization was lacked
because of raid cooling.
Publisher
Trans Tech Publications, Ltd.
Subject
Mechanical Engineering,Mechanics of Materials,Condensed Matter Physics,General Materials Science
Cited by
8 articles.
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