![]() ![]() Ultrasonic emulsification is an excellent tool to prepare stable nano- and miniemulsions as well as Pickering emulsions. Pickering emulsions are based on the use of biopolymeric emulsifiers or solid particles as stabilizers in order to create stable cosmetic products with pleasant product characteristics. Surfactant-free / emulsifier-free emulsions are a desirable alternative to conventional cosmetic formulations. Such products are reduced mostly to the active ingredients, which nurture the skin, and are mostly free of additives (e.g. Furthermore, a growing number of consumers is demanding for natural, clean cosmetic products. For skin care products, the use of low molecular weight, amphiphilic surfactants often causes intolerances of cosmetic products with sensitive skin. Ionic or non-ionic surfactants are commonly used as emulsifiers. To form a stable mixture from these immiscible materials, the use of stabilizers is required to prepare an emulsion with an appropriate shelf life. This means that they are in accordance to the second law of thermodynamics inherently unstable. Most skin care products represent a mixture of two or more substances that are not miscible with each other. During the emulsification procedure, the sample is cooled in an ice bath to prevent heating of the sample.įacts Worth Knowing Why Surfactant-free Emulsions? 2 minutes of sonication, a homogeneous and stable emulsion is formed. For the o/w-emulsion, the oil is gradually added using a pipette to the aqueous phase, whilst the mixture is sonicated.The continuous phase is prepared by dispersing 2wt% laponite® powder in 0.1M NaCl (in ultra-pure water), dispersing by using Hielscher’s ultrasonic homogenizer UP200St or UP200Ht (200W, 26kHz) for a few minutes minutes.The continuous phase consists in a water – laponite® dispersion, the internal/dispersed phase consists in castor oil. Ultrasonic formulation of a castor oil-in-water emulsionĪ Pickering oil-in-water emulsions can be prepared the following way: easy application to the skin, sprayable products etc). This means that sonication is an excellent method to formulate even cosmetic emulsions with shear-thinning characteristics which are also thixotropic and offer thereby good application characteristics (e.g. The big advantage of clays is their dual function since they stabilize the emulsion and simultaneously act as rheology modifiers in the formulation. The high shear forces of ultrasonic emulsification enables to mix even rheology modifiers, which are normally hard to disperse such as clays and clay-based products into cosmetic formulations. for moisturizers, creams, lotions, sunscreens, ointments etc.).Ĭlays and clay-based products show good results a stabilizers in Pickering emulsions. ![]() Sonication is a non-thermal emulsification process that is already widely used to emulsify w/o-, o/w-, and w/o/w-systems to produce stable emulsions (e.g. Powerful ultrasonic shear forces allow to prepare stable, surfactant-free Pickering emulsions using micron- and nano-particles as stabilizer. Ultrasonic mixing and emulsification is an excellent technique to formulate highly stable surfactant-free Pickering emulsions.Pickering emulsions are surfactant-/emulsifier-free w/o- or o/w-mixtures stabilized by particles.Due to the increasing demand for eco-friendly cosmetics, the cosmetic industry is focussing on the formulation of surfactant-free emulsions.Active components active substance castor oil chitosan clay co-stabilizer coalescence cold creams collagen continuous phase cosmetic cosmetics creams double emulsion emollient emulsification emulsifier-free emulsions emulsifying emulsifying agent emulsion stability formulation foundation fragrances gel hyaluronic acid hydro dispersion gel hydrolipid dispersion laponite Laponiter latex latex emulsion layered silicate lipid nanostructures liposomes lotions macromolecules make-up micelles mini emulsions moisturizers MPC48 MultiPhaseCavitator multiple emulsions nano droplets nano emulsions o/w emulsions oil phase ointment pharma Pickering emulsion Pickering emulsions polymeric emulsions rheology rheology modifier shear-thinning shelf life Silica silica dispersion silicate silicone oil skin skin care products starch sub-micron emulsions sunscreen surfactant-free synthetic smectic clay thixotropic emulsions thixotropic gel tinctures translucent emulsion transparent emulsion ultrasonic emulsifier ultrasonic emulsifying ultrasonic homogenizer Ultrasonic Mixer W/O emulsion yield stress ![]()
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