Octadecane O/W emulsion
I’m in a tough spot. I’m trying to synthesis a stable phase changing emulsion, meaning it goes through thermal cycles (tempering).
The oil is n-octadecane and the water is the continuous phase.
I using span 60 and tween 60 as the surfactants I’m utilizing the HLB method to match the surfactant ratio to the HLB of the oil which isn’t really known.
I have tried HLB 10, 11,12 with different weight percentages of the surfactants (3,5,7,9).
Seems that obviously the more surfactant the longer it takes to phase separate. However, the lower the HLB the more stable the emulsion. These were stored at 60degC.
I’m curious about adding an anionic surfactant to help better stablize the emulsion due to electrostatic repulsion. Which one should I utilize, sodium stearate?
Also, what are good method in synthesizing nanoemulsions other than Phase inversion method?
Log in to reply.