US 2006/0222780 A1Published application

Method for obtaining nanoparticles

OwnerSergey Gurevich, Vladimir Kozhevin +1inventors

InventorsSergey Gurevich, Vladimir Kozhevin, Denis Yavsin

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Abstract

The method is intended for obtaining nanosize amorphous particles, which find use in various fields of science and technology; in particular, metallic nanostructures can be regarded as a promising material for creating new sensors and electronic and optoelectronic devices and for developing new types of highly selective solid catalysts. The method for obtaining nanoparticles includes the following stages: dispersion of a molten material; supply of the resulting liquid drops of this material into a plasma with parameters satisfying the aforementioned relationships, which is formed in an inert gas at a pressure of 10−4-10−1 Pa; cooling of liquid nanoparticles formed in the said plasma to their hardening; and deposition of the resulting solid nanoparticles onto a support.

Claims8

Dependent claims

The method for obtaining nanoparticles, comprising:

dispersing a molten material to obtain liquid drops;
supplying the resulting liquid drops of the material into a plasma formed in an inert gas at a pressure of 10−4-10−1 Pa to form liquid nanoparticles;
cooling of the liquid nanoparticles formed in the plasma to form solid nanoparticles;
and
depositing of the resulting solid nanoparticles onto a support;
wherein the plasma parameters are satisfying the relations
T
e
>
1.4
·
10
5
⁢
R
D
⁢
R
⁡
(
R
D
+
R
)
R
D
+
2
⁢
R
(
1
)
n
e
1
/
2
>
9
⁢
τ
d
-
1
⁡
(
1
+
R
D
r
)
(
2
)
1
τ
p
+
10
3
L
>
10
-
5
⁢
T
m
3
(
3
)
where R and r are, respectively, the maximum and minimum radii of the liquid drops supplied into the plasma, m;
R
D
=
7.5
·
10
3
⁢
T
e
n
e
is the Debye screening length, m;
Te is the electron temperature of the plasma, eV;
ne is the density of the plasma, m−3;
τd is the time of transit of the liquid drops across a plasma zone, s;
τp is the lifetime of the plasma, s;
Tm is the melting point of a conducting material, K;
L is the characteristic distance along which the plasma pressure decreases by a factor of e, m.

92 more elements

Dependencies are inferred from the claim text.

Facts

Application: 11/366,885Filed 2 Mar 2006
Priority: RU RU20031278229 Sep 2003
Published: 5 Oct 2006
Term ends: Not estimatedThe source records don’t support an estimate.

Classification9 codes

B22F 9/008
Amorphous or microcrystalline: rapid solidification processing
B22F 1/054
Metallic powder characterised by the size or surface area of the particles: nanosized particles
B22F 1/08
Metallic powder; Treatment of metallic powder, e.g. to facilitate working or to improve properties: metallic powder characterised by particles…
B22F 9/082
By casting, e.g. through sieves or in water, by atomising or spraying: atomising using a fluid