Centrifuge balancing rotor

For smooth operation of the centrifuge, the rotor must be properly balanced. The weight of racks, tubes, and their contents on opposite sides of a rotor should not differ by more than 1% or by an acceptable limit established by the manufacturer. The smaller the difference in weight is, the smoother the centrifugation. Before centrifuging any laboratory specimens, pairs of adapters and specimen tubes should be placed on opposite pans of a balance, and the tubes rearranged so that tire weights are equal and the placement of tubes is symmetrical. Tubes filled with water may also be... 

If the concentration profile can be determined the moduli can be evaluated. In principle there is no reason why this should be a non-linear measurement, it depends upon the magnitude of the gravitational Peclet number. Buscall35 suggested that a low speed centrifuge could be used to apply different acceleration gradients to the dispersion. If the angular velocity of the rotor is cor and if X is the distance from the centre of the rotor to the top of the sediment then the pressure balance equation becomes... 

The applied force is, therefore, a function only of distance from the rotor and the centrifugal speed, that is, it has the same magnitude irrespective of the density and nature of the material tested, and the pattern of water removal will depend on the pore size distribution of the material. At equilibrium, pa will be everywhere balanced by a capillary pressure, pc, which can also be expressed as follows (Washburn, 1921) ... 

Transfer the filtrate to centrifuge tubes. Be sure each pair of centrifuge tubes is carefully balanced (use a Harvard triple-beam balance) before they are placed in a centrifuge rotor. 

Make sure that the outsidb of the centrifuge tubes, the sample holders and sample chambers are dryr any liquid present will" cause an imbalarfce during centrifugation (as well as potentially causing corrosive damage-.to the rotor). Balanced tubes must be placed opposite each other, use a simple code if necessary, to prevent errors/... 

The classification of product leaving the mill depends on a balance between centrifugal forces and drag forces in the flow field around the mill outlet. Mill types A and C create a free vortex at the outlet, while jet mill D makes use of gravity. Type B has an integrated rotor. The final product quality is largely determined by the success of classification. 

A principal problem of the technique is the restriction of the sample size, because it has to fit into a MAS rotor and be carefully balanced to provide high spinning speeds, while high centrifugal forces may cause sample defor-... 

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