NANOTRIBOLOGICAL CHARACTERIZATION OF HUMAN HAIR AND SKIN
NANOTRIBOLOGICAL CHARACTERIZATION OF HUMAN HAIR AND SKIN USING ATOMIC FORCE MICROSCOPY (AFM)
Carmen A. LaTorre
M.S. Thesis,
Department of Mechanical Engineering, June 2005
ABSTRACT
Human hair is a nanocomposite biological fiber. Maintaining the health, feel, shine, color, softness, and overall aesthetics of the hair is highly desired. Hair care products such as shampoos and conditioners, along with damaging processes such as chemical dyeing and permanent wave treatments, affect the maintenance and grooming process and are important to study because they alter many hair properties. Nanoscale characterization of the morphological, frictional, and adhesive properties (tribological properties) of hair are essential to evaluate and develop better cosmetic products, and to advance the understanding of biological and cosmetic science. The atomic/friction force microscope (AFM/FFM) has recently become an important tool for studying the micro/nanoscale properties of human hair. This thesis presents a comprehensive review of tribological properties of various hair and skin as a function of ethnicity, damage, conditioning treatment, and various environments. Nanotribological properties such as roughness, friction, adhesion, and wear are presented, as well as investigations of scale effects and directionality dependence on friction and adhesion.
| Attachment | Size |
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| Full Thesis PDF File, 5MB, 151 pages | 4.95 MB |