Hydration dynamics of human fingernails: An ellipsometric study

被引：17

作者：

Schulz, B. ^{[1
]}

Chan, D. ^{[1
]}

Bäckström, J. ^{[1
]}

Rübhausen, M. ^{[1
]}

Wittern, K.P. ^{[2
]}

Wessel, S. ^{[2
]}

Wepf, R. ^{[2
]}

Williams, S. ^{[3
]}

机构：

[1] Institut für Angewandte Physik, Zentrum für Mikrostrukurforsch., Universität Hamburg, Jungiusstraße 11, D-20355 Hamburg, Germany

[2] Beiersdorf AG, Unnastraße 48, D-20245 Hamburg, Germany

[3] Fb. Chem., Kosmetik und Korperpflege, Universität Hamburg, Von-Melle-Park 8, D-20146 Hamburg, Germany

来源：

Physical Review E - Statistical, Nonlinear, and Soft Matter Physics | 2002年 / 65卷 / 06期

关键词：

Dehydration - Dynamics - Hydration - Raman spectroscopy - Refractive index - Spectroscopy - Tissue;

D O I：

10.1103/PhysRevE.65.061913

中图分类号：

学科分类号：

摘要：

We use spectroscopic ellipsometry to obtain the complex refractive index, n˜ = n + ik, of human fingernails. By studying the change of n˜ 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. © 2002 The American Physical Society.

引用

页码：1 / 061913