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Research Papers

Metal Oxide Nanopowder Production by Evaporation–
Condensation Using a Focused Microwave Radiation at a Frequency of 24 GHz

[+] Author and Article Information
A. V. Samokhin

Baykov Institute of Metallurgy and
Materials Science,
Leninskii pr., 49,
Moscow 119991, Russia
e-mail: samokhin@imet.ac.ru

N. V. Alexeev

Baykov Institute of Metallurgy and
Materials Science,
Leninskii pr., 49,
Moscow 119991, Russia
e-mail: alexeev@imet.ac.ru

A. V. Vodopyanov

Institute of Applied Physics,
Uljanova Street, 46,
Nizhny Novgorod 603950, Russia
e-mail: avod@yandex.ru

D. A. Mansfeld

Institute of Applied Physics,
Uljanova Street, 46,
Nizhny Novgorod 603950, Russia
e-mail: mansfeld@yandex.ru

Yu. V. Tsvetkov

Baykov Institute of Metallurgy and
Materials Science,
Leninskii pr., 49,
Moscow 119991, Russia
e-mail: tsvetkov@imet.ac.ru

Manuscript received August 25, 2015; final manuscript received November 6, 2015; published online December 14, 2015. Assoc. Editor: Abraham Quan Wang.

J. Nanotechnol. Eng. Med 6(1), 011008 (Dec 14, 2015) (6 pages) Paper No: NANO-15-1070; doi: 10.1115/1.4032015 History: Received August 25, 2015; Revised November 06, 2015

The new method for metal oxide nanopowder production is proposed. It is the evaporation–condensation using a focused microwave radiation. The source of microwaves is technological gyrotron with frequency of 24 GHz and power up to 7 kW with the energy density flux of 13 kW/cm2. Radiation was focused on the layer of powder of the treated material to ensure its evaporation, subsequent condensation of vapor in the gas stream, and deposition of particles on the water-cooled surface. Deposited powders consist of particles whose sizes are in the range of 20 nm to 1 μm. The powder consists of particles having different shapes—close to spherical shape as well as octahedral, which indicates that the mechanism of particles formation is “vapor–liquid–crystal” as well as “vapor–crystal.” The maximum evaporation rate was 100 g/hr. The proposed approach is original and extends the possible methods of producing nanoparticles.

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References

Figures

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Fig. 1

Experimental setup: 1—gyrotron, 2—waveguide, and 3—evaporation–condensation section

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Fig. 2

Schematic view of the evaporation–condensation sections: 1—vessel, 2—thermally insulating material, 3—crucible with material, 4—water-cooled collector, 5—microwave focusing mirror, and 6—quartz window

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Fig. 3

Dependence of the saturated vapor pressure of oxide on the temperature: 1—WO3, 2—SnO2, 3—ZnO, and 4—SiO2

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Fig. 4

Crucible with WO3 before (left) and after (right) microwave processing

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Fig. 5

Evaporation rate of WO3 on time: 1—thermally insulated unit, 2—water-cooled unit, sequential exposures, and 3—water-cooled unit continuous exposure

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Fig. 6

Evaporation rate of WO3 versus microwave power

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Fig. 7

Microscope image of WO3 powder

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Fig. 8

Number (1, 1′) and volume (2, 2′) function of particle size distribution of WO3 particles: 1, 2—probability density and 1′, 2′—cumulative density

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Fig. 9

Microscope image of SnO2 powder

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Fig. 10

Number (1, 1′) and volume (2, 2′) function of particle size distribution of SnO2 particles: 1, 2—probability density and 1′, 2′—cumulative density

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Fig. 11

Microscope image of ZnO powder

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