If we use ionic surfactant in emulsion for stability, what factors do influence the charge?
1. Amount of ionic surfactant
2. Ratio of ionic to total emulsifier
3. pH of emulsion
4. Type of surfactant (for example at certain pH SLS would have more charge than SSL or not)
5. Or any other factor
And for anionic emulsion, which anionic emulsifiers work well at pH 4?