DFG Priority Programme 1273: "Chemical Engineering of Colloidal Systems"
Emulsions are common formulation concepts employed to build stable systems consisting of two immiscible or partly immiscible liquids. They can be formed and stabilized only in the presence of well selected surfactants, polymers, proteins and their mixtures. A new alternative approach uses nanoparticles according to the well-known principle of Pickering. Especially, for products which contain particles in their formulation an additional or even complete stabilisation by these particles will be a new and interesting concept. The key factor for the use of particles as stabilizing agent is their wetting by the two phases, namely the oil and aqueous phase. However, the affinity to each of the two phases should be different and is expressed by the contact angle. The contact angle is an excellent measure describing the wettability of particles and their affinity interacting with liquids. Furthermore, it affects the stability of the emulsion through the energy of attachment in particles at the interfaces.