Measuring Skin Cream using Rheometry
The formulated product to be measured is a skin cream (moisturiser). The moisturiser is a two phase system comprising of an oil phase and water phase. For this essay, I will consider the product as oil in water emulsion. Examples of such products found in the market today include: Olay Total Effects Facial Moisturiser, Nivea daily moisturiser and Johnson baby lotion. The reverse technology; water in oil emulsions are also available. A facial moisturiser is designed primarily to protect the skin from drying out. Moisturizers do this by holding water in the stratum corneum, the outermost layer of the skin. They can also help protect your skin from the environment by creating a barrier on your skin that keeps oils from escaping and harmful outside elements from causing dryness or irritation. The consumer acceptance of a skin cream is very much dependent on its “feel” when taken from the jar or tube and applied to the skin. There are two key moments of truth which determine the overall consumer experience. The first is when the product is dispensed from the pack and as it rests on the hands. The second is when the product is applied or rubbed onto the face. These ‘experiences’ are governed by its rheological properties. The shear thinning characteristic of skin creams is important to delivering the desired product performance. Rheology shear rate tests measure this behaviour. Rheology is the science dealing with flow behaviour and deformation of materials. Rheological instrument and measurements have become essential tools in analytical laboratories of companies for characterising ingredients and final products, as well as predicting product performance and consumer acceptance. Knowledge of the rheological properties for these emulsions is important in the design and optimisation of processing equipment for production; checking product meets specification and quality control. Polymers and surfactants...
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