[parsimonious9]

What would be maximum volume fraction of oil that cannot form a microemulsion?

[parsimonious9]

@Pharma
Pretty much cosmetics like a battery lol

Okay cool. I’ll look into the lit you linked.

@chemicalmatt
Sonicator or High pressure homoginzer etc. correct?
Any idea why propylene glycol is critical?

[parsimonious9]

Besides the PIT. The Span 60 is a solid-state surfactant below 55 degC, I’m thinking it crystallizes and creates a network which can prohibit creaming or just slow it down. 

Yes the DLS gives size distribution. 

I did not centrifuge my product. What would be the procedure to look at the time lapse of this? Just centrifuge for a period, measure the cream layer, centrifuge again, measure again the top layer, and keep on repeating? How do you correlate that to actually time? 

Also, measure the size of the particles for the top, middle, and bottom of the tube? For what purpose really? To see focculation or some other stability?  

Sorry, I’m ignorant on the subject and I’m learning. I definitely appreciate your insight. 

Well we are trying to use the phase transition of the oil going from solid to liquid and vice versa to store and transport energy (heat) due to latent heat of fusion

[parsimonious9]

I’m storing it at 60degC to promote separation. It’s stable at room temperature to about 50 degC. I’m not sure if the Span 60 is the reason for this. It’s melting temperature is around 55 degC. So I’m thinking that Span 60 is making a crystalline network which is prohibiting the droplets to move. 

Any idea what I should do to verify that?

I am using DLS to acquire droplet size. 

The literature regarding the Tween 80 -Span 80, it was a 1:1 ratio with the oil, can you direct me to that paper?

Also, because of this thermal cycling I read that it can be partial coalescence  that causing this cause phase separation. Any thoughts about this or ways to verify?