Transition from disc to rod-like shape of 16-3-16 dimeric micelles in aqueous solutions

Abstract

Small-angle neutron scattering (SANS) measurements from bis-cationic C₁₆H₃₃N⁺(CH₃)₂– (CH₂)₃–N⁺(CH₃)₂C₁₆H₃₃ 2Br^- dimeric surfactant, referred to as 16-3-16, at different concentrations and temperatures, are reported. It is seen that micelles are disc-like for concentrations C=2.5 and 10 mM at temperature T=30°C. At low concentration C=0.5 mM micelles are rod-like. Similarly, there is a disc to rod-like transition of micelles on increasing the temperature. For C=2.5 mM, micelles are rod-like at T=45 and 70°C.