Hi to all, I have some polymers synthesized on nanometric scale with COOH groups. I want to calculate the surface charge density, the sample was characterized by means of a conductometric titration, with a dilute solution of NaOH, the analysis gave the equivalent of NaOH to the weak acid and the conductivity in mS/cm. I know the density and the surface area of the sample, but I do not know how to calculate the surface charge of the sample, it should give a result in C/nm2 or e/nm2. How can I calculate that data? I think I must use either the Gouy-Chapman theory or the Debye-Hücker theory.