Abstract:

Light scattering(LS) technique was employed to investigate the interaction between perchlorate and cationic surfactant cetyltrimethylammonium bromide(CTAB). It was found that perchlorate could combine with CTAB in an acidic medium to form ionic associated compounds due to the electrostatic attraction, resulting in enhanced LS signals. It should be noted that anions such as Cl^-, Br^-, ClO₃^-, NO₃^- and PO₄^3- can only induce weak LS signals when interacting with CTAB alone, but significant changes of LS signals can be observed once these anions coexist with perchlorate, indicating that coordinating effects exist. In order to discuss the coordination mechanism, dynamic light scattering(DLS) measurements were further made with chlorate(Cl^-) as an example.

Key words: Perchlorate, Cetyltrimethylammonium Bromide (CTAB), Light Scattering (LS), Dynamic Light Scattering (DLS)