3. Specific properties of Pickering emulsions for skin care

The skin is a complex organ due to its organization and physicochemical characteristics. It is composed of three layers, which are, from the outer surface to the innermost layer: the epidermis, the dermis, and the hypodermis. The surface is composed of a multilayered, keratinized, differentiated epithelial lining, the outermost layer of which, called the stratum corneum, is dead and represents the final stage of differentiation. Its main role is to act as a barrier for the skin. It is composed of dead cells called "corneocytes," whose corneous membrane is very resistant and whose constituents are closely intertwined with intercellular lipids organized in bilayers and intercellular junctions (figure...