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Effects of plasma treatment of wool on the uptake of sulfonated dyes with different hydrophobic properties
journal contribution
posted on 2010-03-01, 00:00 authored by Maryam NaebeMaryam Naebe, Peter Cookson, John Rippon, R Brady, Xungai WangA wool fabric has been subjected to an atmospheric-pressure treatment with a helium plasma for 30 seconds. X-ray photoelectron spectroscopy and time-of-flight secondary ion mass spectrometry confirmed removal of the covalently-bound fatty acid layer (F-layer) from the surface of the wool fibers, resulting in exposure of the underlying, hydrophilic protein material. Dye uptake experiments were carried out at 50 ºC to evaluate the effects of plasma on the rate of dye uptake by the fiber surface, as well as give an indication of the adsorption characteristics in the early stages of a typical dyeing cycle. The dyes used were typical, sulfonated wool dyes with a range of hydrophobic characteristics, as determined by their partitioning behavior between water and n-butanol. No significant effects of plasma on the rate of dye adsorption were observed with relatively hydrophobic dyes. In contrast, the relatively hydrophilic dyes were adsorbed more rapidly (and uniformly) by the plasma-treated fabric. It was concluded that adsorption of hydrophobic dyes on plasma-treated wool was influenced by hydrophobic interactions, whereas electrostatic effects predominated for dyes of more hydrophilic character. On heating the dyebath to 90 ºC in order to achieve fiber penetration, no significant effect of the plasma treatment on the extent of uptake or levelness of a relatively hydrophilic dye was observed as equilibrium conditions were approached.
History
Journal
Textile research journalVolume
80Issue
4Pagination
312 - 324Publisher
Sage PublicationsLocation
London, EnglandPublisher DOI
ISSN
0040-5175eISSN
1746-7748Language
engPublication classification
C1 Refereed article in a scholarly journalCopyright notice
2009, Sage PublicationsUsage metrics
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