Solid vs liquid lipids emulsion stability

 I make a simple moisturizer emulsion that has 5% lipids. The aim is to reduce the cost as much as possible. It is a low viscosity lotion in flip top bottle.
Ingredients are 
Water
0.6% sodium stearoyl lactylate
2.4% glyceryl mono stearate
1% Shea butter or coconut oil
4% petrolatum or mineral oil
5% glycerin
1% phenoxyethanol/caprylyl Glycol
0.1% caprylyl Glycol
0.2% EDTA
0.1% FO
0.3% xanthan gum
0.2% dimethicone 5cst

My question is, does viscosity of lipid phase has any effect on emulsion stability?

I mean which one would be more stable? Petroleum+shea butter in oil phase or mineral oil+coconut oil.




Comments

  • PharmaPharma Member, Pharmacist
    Abdullah said:
    ...
    My question is, does viscosity of lipid phase has any effect on emulsion stability?
    ...

    Yes. Purely stability-wise, higher inner phase viscosity makes an emulsion (or rather the oil droplets therein) more stable regarding coalescence and Ostwald ripening.
  • Pharma said:
    Abdullah said:
    ...
    My question is, does viscosity of lipid phase has any effect on emulsion stability?
    ...

    Yes. Purely stability-wise, higher inner phase viscosity makes an emulsion (or rather the oil droplets therein) more stable regarding coalescence and Ostwald ripening.
    Thanks.
    I am currently using petrolatum+shea butter too.
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