Low-energy nanoemulsions are possible given recent findings, opening the door to shelf-stable and smooth formulations ready for scaled-up production.
Nanoemulsions are beneficial to active delivery in personal care due to their small surface area to volume—they contain droplets with a diameter of 200 nanometers or smaller—which makes them more stable and allows them to carry larger payloads of actives. A lower-energy version has the potential to make the process easier to adapt for large-scale manufacturing.
Related: MIT Mixes Emulsions That Stick
To create the new low-energy emulsions, researchers reduced droplet size with two uncharged—read: less likely to irritate skin—FDA-approved surfactants, along with a small amount of polyethylene glycol (PEG). Active ingredients could be mixed into the oil phase before the emulsion formed to be incorporated into the droplets for delivery.
The result was an oil-in-water nanoemulsion that remained stable for more than a year.
Researchers added a step to allow the the emulsions to be converted to gels when reaching body temperature by incorporating poloxamers, or heat-sensitive polymers. This enabled the formation of a jelly-like solid once the emulsion reached body temperature, which researchers are now experimenting with in order to effectively incorporate actives.