By Claude Bouillon, John Wilkinson
The main complete resource at the topic, this moment version is totally revised and extended to bare the newest advances, applied sciences, and developments in hair and hair care science-tracking the improvement of hair care items, the emergence of recent regulatory practices, and the newest tools in product safeguard and efficacy overview.
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Extra resources for The Science of Hair Care
Figure 35 Diagram of a bent fiber. (From Ref. ) Numerous methods have been proposed for measuring the flexion modulus, including static methods in which the fiber is bent by applying a given force and its strain recorded (196–198), and dynamic methods in which the fibers, attached horizontally by one of their ends, are subjected to vibrations (199). Using a pendulum, it was observed that the behavior under flexion was directly related to the diameter of the fibers (198) (Fig. 36): the flexion modulus is proportional to the diameter by the power of 4.
Asian hair is very strong, and the resistance to breakage is similar to that of Caucasian hair. To visualize the breakage, some studies (191–194) have been carried out using SEM. Three types of fracture are encountered in the breakage of human hair under longitudinal extension: smooth fracture, step fracture, and fibrillated fracture (193). Humidity and conditioning of the hair fiber play an important role in the type of fracture observed. Hair breakage can also be studied using other types of stress that better reflect real life conditions than the tensile test.
100) observed that two KAP alleles were specific to Japanese population and were not found in Caucasians. 2. The Lipids Hair lipids can originate from two sources. They may arise from cell membrane remains or from the sebum adsorbed by hair in contact with the scalp. ) yields a quantity of lipids amounting to 1–9% of the hair mass and their composition closely resembles that of sebum which implies that the major part of extractable lipids results from sebaceous contamination (101–104). A more thorough extraction using a mixture of solvents at high temperature or following alkaline hydrolysis of the hair yields the constituent lipids of hair (often called internal lipids), part of them being free lipids, and another part enclosing the components of the cell membrane complex or of the epicuticle (105).
The Science of Hair Care by Claude Bouillon, John Wilkinson