Measuring the Chemical & Physical Properties of Human Hair Surfaces
The surface characterisation of hair fibres can deliver important insights into the performance of hair care products and in the development of improved product formulations based on an understanding of the connection between product use and the resulting surface properties of the treated hair fibres. This paper reviews the range of relevant hair properties together with the use of topographical and chemical surface characterisation techniques for their determination.
Non-contact white light interferometry and 3D scanning electron microscopy are used to investigate topographical consequences such as scale height and hair damage. These techniques provide statistically based metrology of hair surfaces either parametrically or as quantified 3D images. In addition we describe the application of chemical surface analysis techniques including X-ray Photoelectron Spectroscopy (XPS) and Secondary Ion Mass Spectrometry (SIMS) to the determination of chemical residues and natural substrates in terms of material identification, level quantification and spatial distribution. In all cases practical applications are described.
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