Effects of counterion structure on the surface activities of anionic fluorinated surfactants whose counterions are organic ammonium ions

- Fluorinated surfactants with a series of organic ammonium counterions were studied.
- It is a convenient way to obtain highly surface-active fluorinated surfactants.
- The difference of COO− and SO3− headgroups still works for these surfactants.
- Small organic counterions show lower γcmc than bulky ones for the three series.