A series of pH sensitive single-tailed surfactants, N-alkyl-1, 2-ethylenediamine (CmN2N, where m= 8, 10, 12, 14, 16), were synthesized and characterized. The adsorption and aggregation properties of them were determined by equilibrium surface tension, static and dynamic light scattering (SLS and DLS), rheology, and cryogenic transmission electron microscopy (cryo-TEM) techniques in detail. It was found that both the surface activity and ...