RMML Co.,Ltd.

Materials List
Flakes of such as Fe, Ni, Cu
The conventional composition method of flakes and the limit of shape control

Conventionally, there are two methods for creating flakes. One of them is crushing it after forming metal foil as a precursor to get flakes. The other one is making a sphere-formed particle as a precursor by atomization method, changing it to flakes by rolling it when it is crushed. Both methods are complicated because we need to melt them to produce precursor and crush them. Another problem is that it is not possible to make flakes from hard metal elements.

Introduction of the particles produced by our new method

By the composition method we developed newly, we can produce flakes of metallic elements, such as Fe, Ni, and Cu. Small production is possible. The shape control is possible to a certain degree. Theoretically, making flakes of almost all kinds of elements and alloy composition will be possible. It is similar as the size control.

  • Cu flake particles
  • Fe flake particles/Ni flake particles
Needle-shaped Cu nanoparticles, metal nanoparticles of Fe, Ni and Co. etc.
The traditional composition method for producing needle-shaped particles using conventional technique and the limit of shape control

The representative application example of needle-shaped nanoparticles is magnetic particles of magnetic recording medium. In this case, we produce needle-shaped precursor of iron hydroxide, such as goethite and lepidocrocite. Moreover, we produce metal particles by hydrogen reduction of them. By adding other elements except Fe, when we produce precursor, control of the coercive force, aspect ratio and control of the thickness of oxidation are possible by changing them to metal alloy particles after reduction. In this method, shape control of the metal powder is limited depending on the range of the crystal shape variety of the hydroxide. The composition of needle-shaped nanoparticles of Cu was found difficult.

Introduction of the particles produced by our new method
  • Cu whisker particles 50-100nm
  • Fe whisker particies 20-50nm
  • Ni nanoparticles 20nm/Feco alloy particales 10-20nm
Fe, Ni, FeNi alloy and FeCo alloy magnetism nanoparticles
Introduction of the particles produced by our new method

We also can compose needle-shaped or spherical magnetic particles by our new composition method, which does not need to be made from the precursor at room temperature. Observed by TEM, we could compose metal magnetic particles of 5-50nm, although it depends on the kind of metal. Theoretically, the composition of the multi-element-based magnetic particles is also possible by this method. We can offer them cheaply in the mass production using this method.

  • Ni nanoparticles 20nm/Feco alloy particales 10-20nm
  • Fe55Ni45alloy particles 5-10nm/Magnetic hysterisis of FeCo alloy particles 10-20nm
Introductions of nanoparticles of such as SnO and ITO
Introduction of the particles produced by our new method

We showed below the example of nanoparticles of the metal oxide produced by our new method. The size of the ITO particles is around 10-20nm, which is extremely small. In addition, the size of SnO powder is micron as the secondary particle, the primary particle of this is produced by agglutinating SnO nanoparticles to 100nm size, and the powder showed below is more aggregated one.
The size of iron oxide is around 10-20nm. In this way, our method of producing metal oxide nanoparticles is not limited by the elemental kind. Although the kind of metal is not limited, it is necessary to choose the best method depending on the elements.

  • SnO powders
  • FITO(InSnO2) nano particles 10-20nm / Fe2O3 nano particles 5-20nm
Introduction of metal nanoparticles of Ta, Nb, Mo, W etc. and oxide nanoparticles
Introduction of the particles made by our new method

We are thinking one new method, which can mass produce nanoparticles at low cost, with which we can produce metal nanoparticles of 30-50nm of Ta, Nb, and Mo. Similarly, in the case of Ta, Mo, we can get very dense films as the following SEM photographs when metal oxide nanoparticles of Ta, Mo of dozens of nm produced by our new method is used.
We will examine the limit of the characteristic control of the particle composition of this method when the elements are changed by using various elements and various alloy composition.With this method, we can offer them very cheaply and easily in the stage of mass production. Observed in TEM, Nb205 made by our new method formed the crystal particles of equilateral triangle like the following picture.

  • Ta nano metal particles 30-80nm
  • substrate coated with Ta2O5 nano particles/Nb2O5 nano particles
  • substrate coated with WO3 nano particles
Introduction of ZnO flakes for the UV absorption
Introduction of the particle made by our new method

In our new composition method, we can manufacture thin ZnO particles of around 5-10nm as follows. Those size of ZnO is around a couple of 100nm.
Theoretically producing compound oxide with other elements is easy because it is not the coprecipitation method. This is the method that we can offer it very cheaply not only in the trial manufacture, but also in the mass production.

  • ZnO nanoparticles 100-1000nm
Introduction of high-purity Al2O3 nanoparticles for a filler and the sintering material
Introduction of the particle made by our new method

In our new composition method, we can manufacture around 50nm Al2O3 particle as follows. Theoretically, producing compound oxides with other elements is easy. This is the method with which we can produce nanoparticles stably not only in the trial manufacture, but also in the mass production, and can offer cheaply. (The following picture is transparent because it’s dispersed in water.)

  • AL2O3 nanoparticles 20-50nm
Introduction of the Ga2O3 nanoparticles for optics and the semiconductor insulation wall
The conventional composition methods and the limit of Ga203 particles

Generally, the Ga2O3 particles are produced by forming hydroxide of Ga metal salts, such as l sulfate, with alkali and heating it. It is difficult to make very thin powder by such a method. Not only that, the composition is limited to the range in which hydroxide can be coprecipitated.

Introduction of the particle made by our new method

The size of Ga2O3 nanoparticles made by our new composition method is around 5-10nm, very small as follows, and transparent when it is dispersed in water. This is the method by which we can offer it very cheaply not only in the trial manufacture, but also in the mass production.

  • Ga2o3 nanoparticles 5-10nm
Introduction of Zn nanoparticles for batteries and anti-rust coating
The conventional composition methods and the limit of shape control of Zn particles

Generally, the Zn particles are produced by gas atomization method and disk atomization method. Therefore, the limit of the particle size was at smallest several microns. A particle grows up because it sinters during floating under vacuum by the evaporation method, so it was difficult to control size and particle size distribution.

Introduction of the particle made by our new method

In the new composition method that we made lately, the following size of Zn nanoparticles of 100-300nm was confirmed. Theoretically, alloying other elements is also easy if we use this method. We are going to check the limit of the characteristic control with various elements. This is the method with which we can offer them very cheaply not only in the trial manufacture, but also in the mass production.

  • Zn nanoparticles 100-1000nm
We are examining the method that might make mass production possible
The general situation

The Graphene is produced experimentally by various methods, but still now, it is difficult to mass-produce at low cost.
There is a method using plasma and CNT as a raw material. However, either of them cannot enable us to mass-produce it at low cost.

The particles we made by our new method

As the following images, we crushed natural black lead simply, and found Graphene distributed by one of our new methods. You can see the yellow colored dispersion liquid. When the density is raised, it becomes aggregate condition microscopically. So, we are now examining the crush and the dispersion.

  • graphene sheets 100-300nm
The new material that has superior catalytic effect in the dark place with room temperature
TEM image of the nanoparticles of tungstic acid ammonium hydrate salt. Average particle size 5nm
  • Transmission electron microscope TEMH-7560 made by Hitachi High-Technologies Corporation-7560
Evaluation result of the catalyst of new material by the public institution

Result of a measurement of Japan Food Research Laboratories (JFRL)

  • graphene sheets 100-300nm
The relations of residual quantity of ammonia and the elapsed time when the quantity of supported catalyst is different

The following graphs compare the ammonia decomposition speed when the quantity of the supported catalyst is decreased. It turned out that the speed greatly changes when the supported catalyst is reduced. Even a smelly person does not have more ammonia levels than 5ppm, which means deodorization of sportswear, bed clothing and the restroom can be possible by using our catalyst.

  • Graph showing the relationship between the amount of ammonia remaining at different catalyst loadings and the elapsed time

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