This is a very simplified flowchart, as there are many other variables involved, but the take-home message here is that the higher the conversion of energy into heat, the higher the dissipation energy, the more kinetically stable emulsion. And finally, the energy of the rapidly moving particles is converted into heat through dissipation. That energy of motion is converted into the large velocity gradients of the dispersed droplets of various sizes. Turbulence, initiated by the high-shearing rotor stator, transfers its energy into kinetic energy within the W/O system. Here is a simplified energy flow chart when you are creating a W/O emulsion: To achieve the desired results, one may use high-energy equipment such as a rotor stator/homogenizer or a deflocculator at moderate to high shear.Ī) Dissipation rate refers to the rate of conversion of turbulence into heat by molecular velocity. Controls particle size of the dispersed phase of the emulsion 1,2.
Creates high energy dissipation rates 1,2.Why do we need high energy when making a W/O emulsion? High energy brings several benefits to your W/O system, altogether contributing to a stable emulsion: When making W/O emulsions, high energy is required.Let’s cover some key concepts to enhance stability when formulating W/O emulsions: So why isn’t W/O used more often? Because (a) it is difficult to create a stable W/O system, and (b) the esthetics of a W/O emulsion are often undesirable (sticky, tacky, thick…).
Water in oil emulsion stability skin#
While O/W systems offer good sensory properties and ease of manufacturing, the primary alternative system – water-in-oil (W/O) – offers distinct advantages, among them long-lasting adherence to the skin and improved water resistance. Yet when asked to create the galenic forms most often requested by marketing – creams and lotions – the “default emulsion” is almost always oil-in-water (O/W). Cosmetic chemists are an innovative, curious, and creative group of scientists, continually looking to formulate the most effective and pleasing products for the world’s consumers.
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