![]() Much of this interest stemmed from the need to understand the effects of textile processing (e.g., shrink proofing) on the physical properties of the wool fibre. Historically, there was a significant amount of research focused on monitoring the frictional properties of wool and other textile fibres. In addition, the interaction of hair fibres with each other as well as with the skin was also investigated. Studies conducted in the following years supported and provided a better understanding of the role played by 18âmethyleicosanoic acid in hair structure as well as the overall tribological properties of the fibre. Initial work in this area aimed to establish a relationship between nanotribology of the hair surface and its macroscale properties. ![]() At the nanoscale, there has been considerable interest in determining the frictional properties of hair fibres. Hair softness, smoothness and friction are important attributes for the consumer that have challenged scientists in the cosmetic industry to develop representative laboratory techniques able to predict the overall properties of a hair fibre assembly. The interaction of skin with hair can involve a variety of tactile sensations including roughness and smoothness, which can manifest themselves in the frictional properties of hair. Haptics involves the sense of touch and deals with sensorial perception when our skin comes into contact with other objects. The chemistry and morphology of the hair surface play a large role in the haptic perception of hair. The surface properties of hair are very important from a consumer sensorial perspective and generally reflect the health state of the fibres.
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