When the suspension containing fine particles stands still, the suspended particles gradually sink due to the action of gravity field. The heavier the particles, the faster they sink, whereas the particles with lower density than the liquid will float. The velocity of particles moving in gravity field is related to the size, shape and density of particles, and also to the strength of gravity field and the viscosity of liquid. Particles the size of red blood cells, with a diameter of several microns, can be observed under the usual gravity.
in addition, the sedimentation of substances in the medium is accompanied by diffusion. Diffusion is unconditional and absolute. Diffusion is inversely proportional to the mass of the substance, and the smaller the particle, the more serious the diffusion. The settlement is relative and conditional, and it can only be moved by external force. Settlement is proportional to the weight of the object, and the larger the particle, the faster the settlement. For particles smaller than a few microns, such as viruses or protein, which are in colloidal or semi-colloidal state in solution, it is impossible to observe the sedimentation process only by gravity. Because the smaller the particles, the slower the settlement and the more serious the diffusion phenomenon. Therefore, it is necessary to use the centrifugal force generated by the Lion Ring Blower to force these particles to overcome the diffusion and produce sedimentation.
The centrifugal force generated by the high-speed rotation of the rotor of the centrifuge is used to accelerate the settling speed of particles in the liquid and separate substances with different sedimentation coefficient and buoyancy densities in the sample.
information source: dongguan shoupu mechanical and electrical co., ltd.