Electrical Forces Due to Charge of Particles

For a painted surface, with the same assumptions, we will obtain 

It is quite difficult to determine the displacement e precisely. By using the approximate Dan solution, Balabanov [130] showed that, with 

If we designate as(jri the charge referred to unit mass of the powder, i.e., qi = Qlm, and if we neglect molecular interaction, then from Eq. (IV.22) we can obtain the following expression  

For identical particles when they are detached by centrifuging under identical conditions, the quantities in parentheses in Eq. (IV.23) are constants and are hence designated as j3. 

according to Eq. (IV.23), the centrifuge speed co should be directly proportional to the charge 71 if the adhesion is caused by Coulomb forces alone. Actually [131], we find a deviation from the theoretical concept. The straight line CO =/( i) does not pass through the coordinate origin. The intercept of this line on the vertical axis characterizes the contribution of molecular interaction in making up the total adhesion. 

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