CATIONIC'GEMINI'SURFACTANTS ADSORBED AT THE TiO_2-SOLUTION INTERFACE.THE INTERPLAY BETWEEN THE OXIDE SURFACE POTENTIAL AND THE SURFACTANT STRUCTURE.

摘要

Gemini or dimeric surfactants have been generating increasing interest owing to their superior performance in applications and their tunable molecular geometry.Geminis consist of two conventional single-tail surfactants whose headgroups are joined covalently by a spacer(usually hydrophobic) of variable length.These molecules show interesting properties both on applicative and fundamental grounds.In this latter respect they represent the link between conventional (monomeric) amphiphiles and polyamphiphiles and allow control of the distances between the surfactant head groups at the water-core interface in tridimensional aggregates.