... The sur- factant N-methyl-N-hexadecyl-4,4'-bipyridiniumz+ (MVl 62+) was synthesized as described previ0us1y.l~ (1 1) Mukerjee, P. “Solution Chemistry of Surfactants”; Mittal, KL, Ed.; (12) Mukerjee, P.; Cardinal, J. r. J. Phys. ... 0 198 1 American Chemical Societv , , I - ... Soc., Vol. ...