ABSTRACT
This chapter explains some brutal approximations to bring out the leading features of the behavior. It discusses that there is an infinite reservoir of salt solution outside the colloidal gel. In these circumstances, any salt that is fractionated out of the gel phase does not affect the salt concentration in the external fluid. It is also concerned with the calculation of the distribution of salt between the gel and supernatant fluid in the two-phase region of colloid stability. This makes the equations much easier to handle the leading features, and the approximation that is easily corrected. The author emphasizes the new approach where the coulombic attraction theory permits a calculation of the salt-fractionation effect because it defines the volume bounded by the macroions. The chapter concludes that there are bold predictions beyond the scope of DLVO theory and many theoreticians have used sophisticated computer programs to study the interactions of plate macroions.
