Shear or no-shear for cool-down phase?
I am working with with the lamellar emulsifier Heliosoft (INCI: Glyceryl Behenate, Behenyl Alcohol, Lecithin), though my question extends to other liquid crystal emulsifiers.
My oil phase is 15%, Heliosoft at 2% (2% can emulsify up to 20%), Siligel at 1%. After initial homogenizing, I am cooling the emulsion down to RT under stirring with overhead stirrer. I add my cool-down phase at 35 C.
*Is the liquid crystal structure still forming at this temperature, and if so is it strong enough to handle brief shear, or would shear disrupt the structure and destabilize the emulsion?
Alternately, is overhead stirring sufficient, or are the particles too big, possibly creating a less stable emulsion?
The manufacturer formulation guidelines for Heliosoft say it can tolerate brief shear at the end of the process (meaning RT?). I tried that (20 seconds) and the emulsion looked less smooth (also some accidental bubbles, I think air, or I hope air not oil!).
My cool-down phase is 2% Na PCA or
2% Water Soluble Extract
3- 3.5 % Oil Soluble Extracts (Including tocopherol and EO).
When you work with liquid crystal emulsifiers, how big is your cool-down phase? What oil % range, what water-soluble % range? Under what type of mixing?
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