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Title: Studies on dyeing with natural dye Juglone (5-hydroxy-1,4-naphthoquinone)
Authors: Gupta, Deepti Bahl
Gulrajani, M L
Keywords: Diffusion coefficient;Dye affinity;Dyeing;5-Hydroxy-1, 4-napthoquinone;Juglone;Natural dye
Issue Date: Dec-1993
Publisher: NISCAIR-CSIR, India
Abstract: Five fibrous substrates, viz. wool, human hair, silk, nylon and polyester, were dyed till equilibrium with Juglone (5-hydroxy-1, 4-naphthoquinone), a natural dye obtained from the hulls of raw walnut, and the kinetics and thermodynamics of dyeing were studied. The isotherms obtained for all the fibres were linear, indicating a partition mechanism of dyeing. The slope of isotherms increased with the increasing temperature in all the cases except wool, where it was independent of temperature. The standard affinity of Juglone for hydrophobic fibres was higher than that for hydrophilic fibres. ΔHᵒ and ΔSᵒ values were positive for all the dyeings. The apparent diffusion coefficient was highest for wool and lowest for silk.
Page(s): 202-206
ISSN: 0975-1025 (Online); 0971-0426 (Print)
Appears in Collections:IJFTR Vol.18(4) [December 1993]

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