| With the development of the society, consumers have more requirements about the textiles. Many new high performance fibers, multi-component fibers and functional fibers are synthesized and being created. What is more, there are some approaches for improving the dyeing methods. However, there are lots of problems exist during traditional dyeing process, such as the low dye-uptake, complicated dyeing process, required high temperature and energy, water wasted and polluted, serious color fading problem and so on. Localized Surface Plasmon Resonance can be tuned by the shape, component, size and the surrounding environment of the particles. Fabrics can be colored by using noble metal nanoparticles due to the unique LSPR properties of noble metal nanoparticles. Water-bath heating and photo-induced methods can be used to synthesis the stable silver and gold nanoparticles. Besides, natural light can be employed for the synthesis, which means the methods are friendly to the environment and fully utilize the resources. The fabrics treated with silver and gold nanoparticles showed different colors and were endowed functional properties. Nanoparticles was regarded as a dyestuff and it was worthwhile to investigate the dyeing method and mechanism, which played an important role in practice production. This thesis includes three aspects as followed:1. Sunlight-induced coloration of silk and functional properties.Silk fabrics were colored by gold nanoparticles(NPs) that were in-situ synthesized through the induction of sunlight. Owing to the localized surface plasmon resonance(LSPR) of gold NPs, the treated silk fabrics presented vivid colors. The photo-induced synthesis of gold NPs were also realized on wet silk through adsorbing gold ions out of solution, which provides a water-saving coloration method for textiles. Besides, the patterning of silk was feasible using this simple sunlight-induced coloration approach. Moreover, it was demonstrated that either UV light or visible light could induce the generation of gold NPs on silk fabrics. The silk fabrics with gold NPs exhibited high light-resistance including great UV-blocking property and excellent fastness to sunlight.2. Functional application of noble metal nanoparticles in-situ synthesized on ramie fibers.Different functions were imparted to ramie fibers through treatment with noble metal nanoparticles including silver and gold nanoparticles. The in-situ synthesis of silver and gold nanoparticles were achieved by heating in the presence of ramie fibers in the corresponding solutions of precursors. The unique optical property of synthesized noble metal nanoparticles, i.e. localized surface plasmon resonance, endowed ramie fibers with bright colors. Silver nanoparticles were obtained in alkaline solution, while acidic condition was conducive to gold nanoparticles. The optical properties of treated ramie fibers were investigated using UV-vis absorption spectroscopy. The ramie fibers treated with noble metal nanoparticles showed remarkable catalytic activity for reduction of 4-nitrophenol(4-NP) by sodium borohydride. Moreover, the silver nanoparticles treatment showed significant antibacterial property on ramie fibers.3. Kinetics of dyeing natural protein fibers based on silver nanoparticles.There are many factors which may affect the traditional dyeing process, such as the p H of the solution, type of the fibers and bath ration, Anisotropic silver nanoparticles were obtained by photo-induced method and employed to color the protein fabrics. The parameters of the kinetics were studied to investigate the mechanism of the dyeing process. The traditional acid blue 199 was used to treat the protein fibers in order to compare with the dyeing process of silver nanoparticles. As a dyestuff, silver nanoparticles were demonstrated to have same in common with acid dyes. |
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