Nano Particles and Planetary Mills
The requirement for various products, components and ingredients to be at the nano scale is more important than ever.
Whether it's in materials research, or the chemical and pharmaceutical industries the creation of nano particles is a fundamental requirement in shaping the future and changing lives - from the therapeutic effects of medicines to the storage of hydrogen in the automobiles of the future.
In this article Fritsch explains how planetary mills play a part in the creation of nano particles and how they are meeting the demand in laboratories and industrial environments around the world.
Principle of the planetary mills
In a planetary mill, the sample is placed inside a grinding bowl along with the grinding balls. By beating, crushing and grinding, the sample is effectively comminuted. Conventional planetary ball mills are characterised by grinding bowls that are fastened onto the sun disk and counter rotate around the centre of this disk.
This limits the maximum possible rotation speed (approx. 800 rpm) because the centrifugal forces acting on the bowls will be so high that the clamping of the bowls can no longer hold. Damage to the mill and the bowls would result. The grinding of materials down to the nanometer range requires very high application of energy and therefore significantly higher rotational speeds than those allowed by typical planetary mills.
Sunken grinding bowls – premium performance.
With the FRITSCH premium line planetary mill, the decisive step into the nano class has now been taken. The revolutionary new feature of the premium line is the sinking of the grinding bowls into the sun disk of the mill to solve these problems!
Now, the centre of gravity of the bowls lies in the plane of the sun disk. The centrifugal forces arising generate significantly lower overturning moment, which in turn allows the mill to run at a significantly higher speed.
As a result, the new FRITSCH premium line attains a speed of up to 1100 rpm, generating up to 150 % higher energy application. This significantly reduces the grinding time to reach the nanometer range. For certain materials, only this level of energy application even allows the creation of nano particles with planetary ball mills.
Date added: 2015-05-25 12:24:54