Water in oil vs. oil in water emulsion

How do you distinguish a W/O from an O/W emulsion? In this video we show a few simple ways to distinguish and to understand the difference between these two types of emulsions and what points a formulator shall take care of when creating any of them.
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Music: tango de la noche, wayne jones

[@Memo-py3eu]

Hello how to join your online courses

[@maxman5573]

Excellent

[@skinchakra]

thank you

[@ammaraljundi9294]

Hi Mam .do you give online courses for cosmetic formulation. Thanks

[@skinchakra]

sorry, missed your comment. Yes we do

[@susanwangcfa3685]

Do you have any basic advice as to why someone would want to create O/W vs W/O for a facial moisturizer? Thank you.

[@fabiennevdk7045]

I'm not a chemist or expert but these are several things I think of when contemplating the differences:
W/O :
PROS:
- Much more skin-friendly as it doesn't compromise the lipid skin barrier. Think about it, emulsifying agents don't stop their emulsifying activity once absorbed into the skin. Which means that a O/W emulsifier will cause the natural lipids in the skin to wash out and compromise the skin's natural barrier that is supposed to protect the skin, thus the skin will be more prone to issues/diseases and TEWL (when using O/W). A W/O leaves the barrier intact.
- Oils can absorb into the dermis much deeper and better which makes oils a good vehicle for active or medicinal ingredients. A W/O emulsifier will encapsulate the water-soluble actives and the oil will transport it into the deeper layers of the skin. It makes the active ingredients more effective.
- a W/O is a good option for sunscreen formulations. It provides a more consistent film on the skin which increases the UV protecting performance. On top of that the formula will be water resistant which is an advantage in a sunscreen product.
- Oil is less sensitive to microbial contamination, if the water phase does not surpass 5% you don't need to add preservatives at all.
CONS:
- As oil is the continues phase the formulation will have a very greasy feel which might be unpleasant for certain skin types and might feel too heavy in certain climates.
- formulating a W/O might be a bit more complicated as it needs to be stabilized with electrolytes. Maybe not so complicated but it does require that extra step.
O/W:
Basically the opposite of the points above: pleasant non-greasy light skin feel and instantly hydrating during use due to the continues water phase but in the long run causing TEWL and diminished barrier protection. It's also much easier to find O/W emulsifiers than W/O as the selection of W/O emulsifiers is quite limited. O/W definitely needs preservatives.
Can't really think of more things right now but I hope this helps.

[@skinchakra]

there is no basic advice. It depends on the purpose, product concept and the ingredients why one should prepfer one emulsion type over the other

[@theshopper6902]

Do you have contact email?

[@skinchakra]

yes we do.