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Imparting Silver into Wool and the Influence of Chloride

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dc.rights.license Author Retains All Rights en_NZ
dc.contributor.advisor Johnston, Jim
dc.contributor.author Chan, Valentine
dc.date.accessioned 2016-05-19T03:19:58Z
dc.date.accessioned 2022-11-03T19:10:53Z
dc.date.available 2016-05-19T03:19:58Z
dc.date.available 2022-11-03T19:10:53Z
dc.date.copyright 2016
dc.date.issued 2016
dc.identifier.uri https://ir.wgtn.ac.nz/handle/123456789/29917
dc.description.abstract The following study is concerned with imparting silver ions to wool fibres to study the uptake in the presence of chloride ions. The primary concern is that silver nitrate uptake in tap water implicates the precipitation of silver chloride when silver ions are exposed to chloride. The procedure involved the use of distilled water, tap water and saline solutions as a comparison. The purpose of introducing silver to wool is to impart the fibres with antimicrobial properties, in order to further understand how silver propagates when silver ion and silver chloride uptake are competing processes. Despite silver exhibiting useful antimicrobial properties, these properties are counterbalanced with high silver(I) reactivity to sunlight and halides. Results from AAS, argentometric Cl– titration and SEM-EDS provide insight that the mechanism is strongly dependent on the temperature and rate of diffusion, both into and within the fibre. Firstly, wool rapidly adsorbs Ag+ and spreads it through the fibre. If AgCl is present, a partial decoupling of AgCl to Ag+ and Cl– occurs due to the common-ion effect, contact with the wool and partial solubility at elevated temperatures. Additionally, Ag+ scavenges impurities in the wool, giving rise to colour in both the wool and the resulting solution. AgCl adsorbs onto the surface of the wool more slowly than Ag+, marginally penetrating the cross-section, while both surface and core Ag+ migrates to the inner rim of the fibre. If there is sufficient Ag+, it binds to sulfur, primarily at the fibre paracortex. Overall, silver uptake into wool is a fragile process that has strong dependence on silver and chloride concentrations, the temperature and the presence of other entities such as dyes or impurities. en_NZ
dc.format pdf en_NZ
dc.language en_NZ
dc.language.iso en_NZ
dc.publisher Te Herenga Waka—Victoria University of Wellington en_NZ
dc.subject Silver en_NZ
dc.subject Tap en_NZ
dc.subject AAS en_NZ
dc.subject Kinetics en_NZ
dc.subject EDS en_NZ
dc.subject Atomic Absorption Spectroscopy en_NZ
dc.subject Energy-dispersive X-ray spectroscopy en_NZ
dc.title Imparting Silver into Wool and the Influence of Chloride en_NZ
dc.type Text en_NZ
dc.date.updated 2016-05-13T16:09:10Z
vuwschema.contributor.unit School of Chemical and Physical Sciences en_NZ
vuwschema.contributor.unit Macdiarmid Institute for Advanced Materials and Nanotechnology en_NZ
vuwschema.subject.anzsrcfor 039903 Industrial Chemistry en_NZ
vuwschema.subject.anzsrcseo 970103 Expanding Knowledge in the Chemical Sciences en_NZ
vuwschema.subject.anzsrcseo 860403 Natural Fibres, Yarns and Fabrics en_NZ
vuwschema.subject.anzsrctoa 3 APPLIED RESEARCH en_NZ
vuwschema.type.vuw Awarded Research Masters Thesis en_NZ
thesis.degree.discipline Chemistry en_NZ
thesis.degree.grantor Te Herenga Waka—Victoria University of Wellington en_NZ
thesis.degree.level Masters en_NZ
thesis.degree.name Master of Science en_NZ

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