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Träfflista för sökning "WFRF:(Chan B) srt2:(2000-2004)"

Sökning: WFRF:(Chan B) > (2000-2004)

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  • Schulz, B., et al. (författare)
  • Hydration dynamics of human fingernails : An ellipsometric study
  • 2002
  • Ingår i: Physical Review E. ; 65
  • Tidskriftsartikel (refereegranskat)abstract
    • We use spectroscopic ellipsometry to obtain the complex refractive index, (n) over tilde =n+ik, of human fingernails. By studying the change of (n) over tilde upon hydration and dehydration, we reveal three different time domains with typical time constants of 4, 150, and 3200 min. A simple model that takes into account the presence of one fast and one slow process is fully consistent with the observed hydration and dehydration dynamics. We attribute these processes to "free" water incorporated between the keratin filaments and water more tightly "bound" in keratin complexes, respectively. From our model we determine the hydration profiles of "free" and "bound" water during, both, hydration and dehydration.
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  • Schulz, B., et al. (författare)
  • Spectroscopic ellipsometry on biological materials - investigation of hydration dynamics and structural properties
  • 2004
  • Ingår i: Thin Solid Films. - 0040-6090 .- 1879-2731. ; 455, s. 731-734
  • Tidskriftsartikel (refereegranskat)abstract
    • We demonstrate that spectral ellipsometry is a suitable optical tool to investigate biological samples such as liver tissue, human nails, and human skin. We have performed ex-vivo as well as in-vivo measurements to obtain via the measured optical parameters psi and Delta information’s such as layer thicknesses or hydration conditions. As an example for in-vivo studies, a tape stripping study of human skin is shown. Furthermore, we present a hydration study of nails over 48 h following a hydration schedule. The dehydration behavior of the nail is compared with the dehydration behavior of liver tissue. By investigating the change of (n) over tilde upon hydration and dehydration, we reveal three different time domains, corresponding to ’free’ and ’bound’ water and their respective rate changes. (C) 2004 Elsevier B.V. All rights reserved.
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