Electrolyte Solution Containing Rod-like Zwitterions

On the basis of the theory of Camie and McLaughhn [5], the Poisson-Boltzmann equation for j/(x) can be modified in the present case as follows. Consider the end of a rod that carries the +e charge. As in the problem of rod-like divalent cations, 

FIGURE 3.6 Positively charged plate in contact with an aqueous solution of rod-like divalent cations of length and concentration and monovalent electrolytes of concentration 

FIGURE 3.7 Rod-like zwitterions of length a carrying +e and —e at its ends. 

FIGURE 3.8 Rod-like ions near the charged surface (a) x aand(b) 0 x a. 

Here we have assumed a Boltzmann distribution for charged species. Thus, the concentration Cz+(x) of the +e end of the rods at position x is given by the product of Eqs. (3.28), (3.29) and the bulk concentration namely. 

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