A study of dye molecule diffusion in human hair using positron lifetime spectroscopy

Chandrashekara, M. N. and Ranganathaiah, C. (2009) A study of dye molecule diffusion in human hair using positron lifetime spectroscopy. Physica Status Solidi C: Conferences and Critical Reviews, 6 (11). pp. 2407-2410.

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The diffusion behavior of a commercial permanent liquid hair dye in human hair has been investigated using Positron Annihilation Lifetime Spectroscopy (PALS) and gravimetric sorption method. The o-Ps lifetime parameters 3 and I3 decrease rapidly during the first 60 minutes of sorption time. This is understood in terms of dye molecules filling the free volume cavities in hair. The sorption results suggest that the dye molecule diffusion is essentially a Fickian process. In the latter part of the sorption, where positron parameters remain almost constant, mass increase might be due to surface adhesion. These two stages of sorption are well separated by the positron technique. The study shows that the free volume theory and positron technique, widely used in polymer research, may expediently be used to understand hair properties, more importantly diffusion of dye molecules. (

Item Type: Article
Uncontrolled Keywords: 68.35.Fx and 68.37.Hk and 78.70.Bj and 82.35.Pq and 87.14.E-
Subjects: D Physical Science > Physics
Divisions: Department of > Physics
Depositing User: Users 19 not found.
Date Deposited: 03 Sep 2019 10:13
Last Modified: 03 Sep 2019 10:13
URI: http://eprints.uni-mysore.ac.in/id/eprint/7490

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