Nanoparticle manufacturing device and nanoparticle manufacturing method and method of manufacturing nanoparticle-dispersed liquid alkali metal

a technology of nanoparticles and manufacturing methods, applied in the direction of transportation and packaging, energy-based chemical/physical/physical-chemical processes, chemical/physical/physical-chemical processes, etc., can solve the problems of high construction cost, high construction cost, and severe chemical reactions, so as to improve the suppression of thermal conductivity and chemical activity, good nanoparticle dispersibility, and stable maintenance of fluidity

Inactive Publication Date: 2011-09-01
JAPAN ATOMIC ENERGY AGENCY INDEPENDANT ADMINISTRATIVE CORP +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Benefits of technology

[0027]According to the method of manufacturing a nanoparticle-dispersed liquid alkali metal of the present invention, even by using nanoparticles aggregating together and nanoparticles having necking, it is possible to manufacture a nanoparticle-dispersed liquid alkali metal which has good dispersibility of nanoparticles and can maintain the state of dispersion even after a

Problems solved by technology

Because of the occurrence of these behavior, the ratio in which coarse particles having particle diameters of not less than 20 nm are produced is very high, thereby posing a problem.
On the other hand, however, liquid alkali metals of sodium or the like have high chemical activity and provide such properties that they can cause severe chemical reactions leading to explosions when they come into contact with air and water.
However, this poses the problems that high-level technologies are required and that the construction cost is high.
That is, there are various kinds of nanoparticles to be input, and for example, in the case of a particle whose primary particle diameter is not more than several tens of nanometers, because of the

Method used

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  • Nanoparticle manufacturing device and nanoparticle manufacturing method and method of manufacturing nanoparticle-dispersed liquid alkali metal
  • Nanoparticle manufacturing device and nanoparticle manufacturing method and method of manufacturing nanoparticle-dispersed liquid alkali metal
  • Nanoparticle manufacturing device and nanoparticle manufacturing method and method of manufacturing nanoparticle-dispersed liquid alkali metal

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Experimental program
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Effect test

embodiment 1

for the Liquid Alkali Metal

[0111]As Embodiment 1 for the liquid alkali metal, a description will be given of the case where the liquid alkali metal is liquid sodium and the nanoparticles are made of titanium.

[0112]In this embodiment, the inventors adopted a method in which a slurry flows only by a propulsive force by ultrasonic waves and the slurry flows efficiently into the ultrasonic irradiation region (the forward end portion of the homogenizer tip 102; a tip 102 having a diameter of 3 mm was adopted here), and they ascertained that the titanium nanoparticles tend to decrease in size.

[0113]Concretely, the particle diameters were measured by use of the particle diameter measuring device LB-550 made by HORIBA, Ltd. and it was ascertained that particle diameters as median size (D50: based on the number of particles), which were several micrometers only by stirring before the ultrasonic irradiation processing, decreased to 109 nm after a lapse of 60 minutes.

[0114]In order to stably d...

embodiment 2

for the Liquid Alkali Metal

[0119]A dispersion test in liquid sodium was carried out using a sample prepared by the manufacturing method of the present invention which is such that the liquid alkali metal of Embodiment 1 is liquid sodium and the nanoparticles are made of titanium.

[0120]The dispersibility of titanium nanoparticles was evaluated by a method which involves causing a sample subjected to ultrasonic irradiation processing to stand. Concretely, a sample irradiated with ultrasonic waves was caused to stand, with the temperature of liquid sodium maintained at a liquid temperature of 350° C., and the titanium concentration remaining in a supernatant liquid of the sample was measured by use of ICP (inductively coupled plasma) (the high-frequency plasma emission spectrometer ICPS-8100 made by Shimazu Corporation) immediately after the ultrasonic irradiation processing, after a lapse of 24 hours and after a lapse of 96 hours. FIG. 11 is a graph showing the results of a standing t...

embodiment 3

for the Liquid Alkali Metal

[0122]Next, an ultrasonic irradiation test was conducted in a case where the resistance time of ultrasonic waves in liquid sodium is changed. FIG. 12 is a graph showing the results of the dispersibility test in which the dispersibility of nanoparticles of a nanoparticle-dispersed liquid sodium produced by the manufacturing method in an embodiment of the present invention changes as a result of changes in the residence time of ultrasonic waves.

[0123]It was ascertained that when the resistance time of ultrasonic waves is changed in liquid sodium, the particles aggregate and the dispersibility becomes worsen when the residence time is too long. In order to improve the dispersibility, it is preferred that the residence time be 5 to 20 seconds when the ultrasonic output density is 460 W / cm2. On the other hand, the output density may take on small values of the order of several to several tens of watts per cm2. In this case, because the surface of the ultrasonic...

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Abstract

A nanoparticle manufacturing device capable of particle size control of nanoparticles made of a raw material metal powder and control of the occurrence condition of chaining of nanoparticles and of necking. The device 1 is provided for manufacturing nanoparticles by heating and melting a mixture of a raw material metal powder and a carrier gas in a heating space, cooling the mixture in a cooling space and collecting the mixture in a collection space. The heating space, the cooling space and the collection space form a continuous flow path without a back flow, and the cross-sectional area of the collection space is set at a large value compared to the cross-sectional area of the heating space and the cooling space. Further, there is provided a method of manufacturing a nanoparticle-dispersed liquid alkali metal by dispersing nanoparticles in a liquid alkali metal. A liquid alkali metal obtained by dispersing nanoparticles in the liquid alkali metal is manufactured by performing a rough dispersion step of stirring nanoparticles in the liquid alkali metal by a physical effect and a dispersion step of dispersing nanoparticles in the liquid alkali metal by irradiating the liquid alkali metal with ultrasonic waves after the rough dispersion step.

Description

BACKGROUND OF THE INVENTION[0001]1. Field of the Invention[0002]The present invention relates to. (A) a nanoparticle manufacturing device and a nanoparticle manufacturing method which are suitable for manufacturing nanoparticles of single metals, alloys and the like.[0003]Further, the present invention relates to (B) a method of manufacturing a nanoparticle-dispersed liquid alkali metal which is used to manufacture a liquid metal obtained by uniformly dispersing nanoparticles in a liquid alkali metal, such as reactor-cooling liquid sodium.[0004]2. Description of the Related Art[0005]Regarding (A) described above, particles having sizes of the order of nanometers, what is called nanoparticles, have unique properties which manifest themselves due to the size effect or have a large specific surface area and, therefore, in recent years studies aimed at applying nanoparticles have been carried out actively in many fields.[0006]Various manufacturing methods of such nanoparticles as descri...

Claims

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Application Information

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IPC IPC(8): B22F9/04C22C1/02B22F1/054B22F1/0545
CPCB01J4/002B01J19/0013B01J19/008B01J19/10B01J2219/00094B82Y30/00B22F1/0018B22F1/0022B22F9/12B22F2999/00B82Y40/00B01J2219/00162B22F2202/11B22F2202/01B22F2301/054B22F2202/07B22F2203/11B22F1/054B22F1/0545
Inventor ARA, KUNIAKISAITO, JUNICHISATO, HIROYUKIOKA, NOBUKINAGAI, MASAHIKOFUKUNAGA, KOICHI
Owner JAPAN ATOMIC ENERGY AGENCY INDEPENDANT ADMINISTRATIVE CORP
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