Materials
Sodium ricinoleate was purchased from TCI chemicals (Tokyo, Japan), tetra butyl ammonium bromide (TBA-Br), tetra propyl ammonium bromide (TPA-Br), cetyl trimethyl ammonium bromide (CTA-Br) and butyl hexyl imodazolium bromide (BHI-Br) were purchased from Sigma Aldrich (St. Louis, USA). Highest grade purity of solvents were purchased from SD Fine Chemicals (Mumbai, India).