Ultrasound is a well-used method for particle size reduction in dispersions and emulsions across many industries and applications. While the use of ultrasound in the processing of personal care formulations does happen, it is currently not very common.
In fact when asking 25 manufacturing clients and colleagues across the European personal care industry, only two were currently using sonication (one of which was literally just finalising installation of new equipment for the first time). Traditionally, personal care formulators have tended to use high shear homogenisation techniques to form emulsions and dispersions.
After researching the possibilities with ultrasound, it became clear it not only offers alternative processing methodology but also opens the door to potentially novel formulations. This is particularly in efficient processing of emulsions and indeed the creation of highly stable emulsions with incredibly low surfactant content.
The aim of this article is to briefly explore sonication as an interesting and potentially exciting processing option for personal care formulations, particularly emulsions.
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