oil-in-water (O/W) emulsion (oil is the dispersed phase”) and water-in-oil (W/O) emulsion (“water is the dispersed phase and sometimes called invert emulsion”)”, Please comment on this with suitable reference
Both are true.
The oil is dispersed in the water, hence "oil-in-water".
Google "invert emulsion" - you'll see lots of references. e.g., https://doi.org/10.1016%2Fj.mex.2016.02.001
Personally, I would never call a W/O emulsion an invert emulsion because it's just an emulsion! The term "invert" implies that somehow O/W is "normal". It's lazy terminology and confusing.
yes, W/0 emulsions are also named reversed emulsions
and O/W direct emulsions
Absolutely, your statement about oil-in-water (O/W) and water-in-oil (W/O) emulsions is spot on. In an oil-in-water (O/W) emulsion, oil droplets are mixed into and dispersed throughout a continuous water base. This setup is pretty common in lots of everyday products like lotions and some sauces, where you want small bits of oil evenly spread through water. On the flip side, a water-in-oil (W/O) emulsion does the opposite: water droplets are mixed into a continuous oil phase. This type is sometimes called an invert emulsion because it's just the reverse of the more typical O/W setup. You'll find this kind of emulsion in things like butter and certain creamy cosmetics, where water is tucked away inside an oily environment. These two types help define how an emulsion behaves, its stability, and even its texture, which is crucial depending on what the emulsion is used for.
Liquid-liquid dispersions of oil-in-water (O/W) can be also denominated as "normal phase" and water-in-oil (W/O) as "reverse phase".
You can have an overview about different liquid-in-liquid dispersions in the introduction of my thesis, as well as the references I used...
Thesis Water-in-oil microemulsions as soft-templates to mediate nan...
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