Surfactants

Greeting everyone, 
I've read that anionic and cationic surfactants cannot be used in a formula due to their conflicting charges. However, I did come across a study from 2007 that basically states using these surfactants together can "present synergic properties". 

I want to create an emulsion using cationic surfactants as the non-ionic surfactants I've tried using haven't provided any foam. I've tried Decyl, Coco, and Caprylyl/Capryl. Is there an anionic surfactant that you all could recommend? If not, what non-ionic surfactant(s) could I use?

Thank you all! 
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