Requirements
for nanoparticle processing based on energy and cost-effective
technologies have increased in recent years. Flame synthesis is widely
used on an industrial scale and is superior to gas phase one-step
processes for producing nanoparticles; however, further improvements
are required from the viewpoint of energy efficiency. In this work,
we present a new aerodynamically stable nanoparticle processing method
with extremely low energy losses, based on the use of a tubular flame.
The developed tubular flame apparatus is inexpensive and simple to
set up, allowing for a uniform and high temperature field with a high
energy efficiency. Consequently, highly crystalline and uniform WO3 nanoparticles were successfully synthesized with a high production
rate. The simple and energy-effective process proposed in this work
has potential for application to various types of functional nanoparticle
production.
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