Colloids Debye-Huckel Approximation For low potential  and (12) Using (12) in (11) and noting the neutrality condition of the burk suspension, (13) it follows that (14) where

Calculation Models Debye Huckel Flat Surface Debye Huckel Spherical Surface

(15)

is the Debye-Huckel parameter.

The solution of (14) for double layer adjacent to a flat plate is given as

(16)

For double layer near a spherical particle of radius ,

(17)

In (16) and (17),  by

(18)

where  varies from less than 1 nm to about 100 nm.