Fabrication Research Of Structurally-colored Fibers Basing On Metal Nanoparticles SPPs Mechanism

Dyeing is a vital process in textile industry, which makes a soluble substance forstaining the fabrics appear with, varies colors. However, dyeing process consumes a hugeamount of fresh water to dissolve the pigments and flush the fabrics. Eventually theunabsorbed remains of the pigments in the water form the industrial sewage, which givesrise to the severe pollution to the environment and causes pollution.Basing on the study of metal pigments used in optically clear matrix, this researchprovides a new way nuancing color and applied physical color on fabrics. Aiming onreducing the waste amount of water and simplify the industry processing, the performanceof structure color producing by golden nanoparticles, by absorption/reflection (mostly pink,red), diffraction (iridescence) and the relationship between nanostructure (Au-nanoparticledispersion, composite function) are discussed in this research.Normally, structural colors are the light in the range of visible light being stronglyreflected, diffracted or scattered by the complex interaction between light and intricatenanostructures, which will display gorgeous colors. In this study, the gold nanoparticlesolution performs an outstanding optical property, which is Surface Plasmon Polaritons(SPPs). It consists of a collective oscillation of conduction electrons excited by theelectromagnetic field of light and amplify, concentrate and manipulate light at nanoscale. Itprovides a rainbow of colors by adjusting Au-nanoparticle sizes and shapes that is mucheasier than building chromogenesis nanostructure. As a result, we make well-establishedapplications of SPPs to electrospinning fibers and natural fibers (cotton and silk) makingnew structure color fiber.In this thesis, structurally–colored fibers were fabricated by the dispersion andcontrolling of oval Au nanoparticles in different concentration with different intensity ofSurface Plasmon Polaritons (SPPs) affection through electronspinning. Firstly, a series ofwater-soluble gold nanoparticles of small particle size were synthesized by PVP as thestabilizer and a reducing agent. The synthesis condition and reagent percentage arecarefully controlled. And the colors of nanoparticle solution and particle sizes are detectedby TEM, ICP－MS, UV-Vis etc. TEM characterization showed that gold nanoparticles prepared in the presence of PVP are mainly spherical particles with the average particlesize of10±2nm. Absorption spectrum result showed that the macrofeature of solutionhighly relative to Au concentration. Apparently the colors of electrospinning fibers couldbe easily tuned by changing the percentage of Au solution. Furthermore, the Lab modelswere employed to calculate the optical properties of electrospinning fibers. The calculatedresults were located in uniform color coordinate system and simulated by computer withthe results measured by experiment. The result demonstrates the feasibility of the potentialthat SPPs color using in industrial application. The change of gradient color red can beeasily mixed in clear optical high polymer matrix and be noticed by naked eyes.Finally, attapulgite, as a new protector and dispersion carrier in Au reduction reaction,creating red structural color fiber with highly dispersion nano-composite and applying onnatural fiber. The basic test of morphology of this nano-composite is tested. Mechanicalproperties of the composite have been characterized with transmission electron microscopy(TEM), scanning electron microscopy (SEM), color testing (LAB*).