| Textile coloration is traditionally achieved by means of using chemical colorantssuch as dyes and pigments. However, the formation of structural color does notrequire any chemical colorants, and the typical properties of structural colors are highbrightness, high saturation, iridescent effect and without fading, etc. In this paper, thethin films with structural color were fabricated on textiles by electrostaticself-assembly approach. The assembly conditions of different fabrics, the morphologyand optical property of SiO2/PEI thin film, the factors of influencing on structuralcolors, the mechanism generating structural colors and the assembly process ofSiO2/PEI thin film with structural color were investigated. It was believed that thisstudy could offer some valuable guidance in developing textile eco-colorationtechnology.The major work could be summarized as follows:1. Assembly conditions ofSiO2/PEI thin films fabricated on different fabrics: polyester fabric and silk fabricwere chosen as matrix materials, and the effects of their surface morphology andphysicochemical properties on the fabrication of SiO2/PEI thin films wereinvestigated. The appropriate assembly conditions for different fabrics were optimizedby evaluating the distribution of SiO2nanoparticles on fiber surface.2. Fabrication ofSiO2/PEI thin film and the influence on optical property and structural color ofSiO2/PEI thin film: SiO2nanoparticles and polyethyleneimine (PEI) polyelectrolytewere alternately fabricated on different fabrics, and the structural colors of fabricscoated with SiO2/PEI thin film were investigated through the color-photos capturedby a digital camera, and also through the reflectance spectra and the images measuredby a DigiEye system and a multi-angle spectrophotometer. The mechanism ofstructural colors formation was studied by discussing the effect of SiO2nanoparticlesize, assembly cycle number and viewing angle on structural colors and analyzing themorphology of SiO2/PEI thin film.3. Morphology and assembly process of SiO2/PEIthin film assembled in different cycles: the distribution of SiO2nanoparticles in SiO2/PEI thin film assembled with different cycles was characterized by scanningelectron microscopy, and the assembly process of SiO2/PEI thin film and drivingforces during the process were analyzed.4. Differences of structural coloration ofSiO2/PEI thin film on different fabrics: the differences of structural colors onpolyester fabric and silk fabric were studied, and the influence on the structural colorswas discussed.The main results were as follows:1. The difference of fiber/fabric in surfacemorphology, hydrophilia and electronegativity influenced the adsorption of PEImolecule and SiO2particles. The appropriate conditions for the SiO2/PEI thin filmsfabricated on polyester fabric were dipping PEI solution before SiO2nanoparticlesdispersion, rinsing3times,0.5wt.%PEI and0.2wt.%SiO2nanoparticles，while therinse time and concentration of PEI of silk fabric needed to increase to5and decreaseto0.1wt.%, respectively.2. The structural colors of as-prepared SiO2/PEI filmscovered on polyester fabric and silk fabric varied with the number of assembly cycle,the size of SiO2nanoparticle and viewing angle. The SiO2/PEI thin film was verifiedto be a homogeneous porous inorganic/organic composite monolayer with structuralcolors originating from single thin film interference.3. The growth of SiO2/PEI thinfilm was owing to the electrostatic attraction between PEI and SiO2nanoparticles, andthe distribution of particles was mainly along with the thickness growth direction ofthe film. The formed SiO2/PEI thin film was not real LBL (layer-by-layer) film due tothe existence of electrostatic attraction and repulsion coexisting system during theassembly process of SiO2/PEI thin film, and the electrostatic self-assembly processmodel of SiO2/PEI thin film was built on basis of this result.4. The difference ofpolyester and silk in surface morphological structure, fiber internal microstructure andaggregation structure of fiber influenced on the constructive interference of SiO2/PEIthin film on the fiber/fabric, which leading to the worse brightness and variable coloreffect of structural colors of silk fabric than that of polyester fabric. |
PDF Full Text Request