Publikationen

Porosity at Different Structural Levels in Human and Yak Belly Hair and Its Effect on Hair Dyeing

Autor(en)
Alexander R.M. Müllner, Ruben Pahl, Doris Brandhuber, Herwig Peterlik
Abstrakt

Yak belly hair was proposed as a cheap substitute for human hair for the development of hair dyes, as its chemical composition closely resembles human hair in Raman spectroscopy. The absence of melanin in yak belly hair also leads to a strong reduction of fluorescence in Raman measurements, which is advantageous for the investigation of the effectivity of hair dyes. To assess the suitability for replacing human hair, we analyzed similarities and differences of both hair types with a variety of methods: Raman spectroscopy, to obtain molecular information; small-angle X-ray scattering to determine the nanostructure, such as intermediate filament distance, distance of lipid layers and nanoporosity; optical and scanning electron microscopy of surfaces and cross sections to determine the porosity at the microstructural level; and density measurements and tensile tests to determine the macroscopic structure, macroporosity and mechanical properties. Both types of hair are similar on a molecular scale, but differ on other length scales: yak belly hair has a smaller intermediate filament distance on the nanoscale. Most striking is a higher porosity of yak belly hair on all hierarchical levels, and a lower Young's modulus on the macroscale. In addition to the higher porosity, yak belly hair has fewer overlapping scales of keratin, which further eases the uptake of coloring. This makes, on the other hand, a comparison of coloring processes difficult, and limits the usefulness of yak belly hair as a substitute for human hair.

Organisation(en)
Dynamik Kondensierter Systeme
Externe Organisation(en)
LIM Cosmetics GmbH
Journal
Molecules
Band
25
Anzahl der Seiten
15
ISSN
1420-3049
DOI
https://doi.org/10.3390/molecules25092143
Publikationsdatum
05-2020
Peer-reviewed
Ja
ÖFOS 2012
103018 Materialphysik, 103042 Elektronenmikroskopie
Schlagwörter
ASJC Scopus Sachgebiete
Analytical Chemistry, Chemistry (miscellaneous), Molecular Medicine, Pharmaceutical Science, Drug Discovery, Physical and Theoretical Chemistry, Organic Chemistry
Link zum Portal
https://ucris.univie.ac.at/portal/de/publications/porosity-at-different-structural-levels-in-human-and-yak-belly-hair-and-its-effect-on-hair-dyeing(730def17-de38-4ca6-a829-f11619703206).html