Process of ultracentrifugation is necessary for effective separation of nanoparticles with sizes less than 100 nm dissolved in a liquid. Nanoparticles can be spatially separated due to the mass difference between the nanoparticles in the original liquid and due to the high centrifugal force. The process of separation of nanoparticles in a liquid, as a rule, is carried out on an ultracentrifuge. The key element of the ultracentrifuge is the rotor where the tubes are placed with the original liquid containing nanoparticles.
  A striking example is the process of separating single-wall carbon nanotubes into semiconductor and metal fractions. Details on this topic can be found
here.
The company “Spectehnauka” took a direct part in the development and creation of a rotor based on titanium alloy VT14 for a laboratory ultracentrifuge. A talented design engineer
Andrey Okhin was invited to this development. Images of the finished rotor are presented below.