Abstract

By introducing the functional theory into the calculation of electric double layer (EDL) interaction,the interaction energies of two identical parallel plates were calculated at 128,77,and 25 mV potentials,respectively. Compared with the results from the Debye-Huckel (DH),Langrauir,and numerical methods,respectively,the results showed that DH and Langmuir methods were applicable just for the critical potentials,but the functional approach with quite accurate and simple analytic expression held true at any potential.

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