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- 저자 : Karthik Chethan Venkateshan (검색결과 1 건)
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Nanoindentation of Hair Cortex and Medulla Regions
Chandrakala Kunchi,Karthik Chethan Venkateshan,Ramesh Babu Adusumalli 한국섬유공학회 2019 Fibers and polymers Vol.20 No.7
Reports related to cuticle damage and hair’s mechanical properties are of interest to dermatologists in treatment ofhair disorders. Apart from tensile test, few studies were reported on mechanical properties of hair, especially nanomechanicalproperties of cortex and medulla regions. Inner diameter of hair fiber (8-12 μm) is considered as medulla and it exists in hairat the beginning of the anagen phase. This study is aimed for quantitative comparison of nanomechanical properties betweencortex and medulla and also with respect to donor age by performing nanoindentation on fiber cross sections using twodifferent instruments. The medulla and cortex regions revealed hardness values of 70-170 MPa and 200-312 MPa,respectively. Similarly lower values of indentation modulus were observed for medulla compared to cortex because medullahas poorer orientation of microfibrils compared to the surrounding cortex. This study also found a linear correlation betweenhardness and indentation modulus especially for medulla region. This could be due to the fact that organization of themicrofibrils increases from the medulla center to medulla periphery. It is also found that donor age has no influence on cortexmodulus and hardness. The findings of this study will be useful for dermatologists in estimating the hair disorders and forestimating dye uptake of keratin fibers in textiles.
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