For a given pH both CAPB and SLSar surfactants can co-exist in their given acid and conjugate base form, i. e., in carboxylic acid (protonated) / carboxylate (deprotonated) form, respectively. If the pH is decreased, the fraction of protonated surfactants increases as determined by the dissociation constant pK a of the carboxylic acid group. Changing the ratio of protonated to deprotonated surfactant can have dramatic changes on the self-assembled structures and therefore the properties of formulations. We represent pH in our simulations by adjusting the ratio of protonated to deprotonated surfactants following the classic Henderson-Hasselbalch model in Eq. ( ). From the reported pK a of the surfactants, i. e. pK a = 4.5 for SLSar 77 and pK a = 1.83 for CAPB, the ratio of protonated and deprotonated surfactants at each pH is calculated from