# How practically to determine dispersion's Hamaker constant using CCC?

I know that Hamaker constants can be determined from CCC data. $$ccc=\frac{9.85 \cdot 10^4 \epsilon^3 k_B^5 T^5 \gamma^4}{N_A e^6 A^2 Z^6}$$ Where, $$\epsilon$$ is solvent dielectric constant, $$N_A$$ is Avagadro constant, $$k_B$$ is Bolcman constant, $$Z$$ is electrolite charge, T is temperature of solution, A is Hamaker constant, e is electron charge.

$$\gamma=\frac{exp(Z e \psi_0 )/2k_B T+1}{exp(Z e \psi_0 )/2k_B T-1}$$.

I can get all constants to determine A except for $$\gamma$$. Where can I get $$\gamma$$ values? Lets assume, that I have CuS stabilized by oleic acid nanoparticles dispersed in hexane, how do I practically find $$\gamma$$? I can grasp that $$\psi_0$$ is somehow related to zeta-potential.