The surface charge on these particles is – 2 mv, in aqueous solution at 30 c. it is expected that the suspension may be exposed to temperatures as high as 120 f. for reference, we need a stability ratio of at least 10^4 to ensure no flocculation.

determine the height of the energy barrier (in j) that is necessary to keep a suspension of polystyrene nanospheres of diameter 100 nm from being flocculated.