Structural coloration of chitosan-cationized cotton fabric using photonic crystals

17th World Textile Conference AUTEX 2017 - Shaping the Future of Textiles

Yavuz, G.^1 ; Zille, A.^2 ; Seventekin, N.^3 ; Souto, A.P.^2

Textile and Apparel Research and Application Center, Ege University, Izmir, Turkey^1

Centro de Ciencia e Tecnologia Textil, 2C2T, Minho University, Guimarães, Portugal^2

Textile Engineering Department, Ege University, Izmir, Turkey^3

关键词: Angles of incidence;    Chitosan depositions;    Composite nanospheres;    Diffuse reflectance spectroscopy;    Face-centered cubic;    Methyl methacrylates;    Photonic structure;    Woven cotton fabrics;   

Others  :  https://iopscience.iop.org/article/10.1088/1757-899X/254/10/102012/pdf
DOI  :  10.1088/1757-899X/254/10/102012

来源: IOP

【 摘 要 】

In this work, poly (styrene-methyl methacrylate-acrylic acid) P(St-MMA-AA) composite nanospheres were deposited onto chitosan-cationized woven cotton fabrics followed by a second layer of chitosan. The deposited photonic crystals (PCs) on the fabrics were evaluated for coating efficiency and resistance, chemical analysis and color variation by optical and SEM microscopy, ATR-FTIR, diffuse reflectance spectroscopy and washing fastness. Chitosan deposition on cotton fabric provided cationic groups on the fiber surface promoting electrostatic interaction with photonic crystals. SEM images of the washed samples indicate that the PCs are firmly coated on the cotton surface only in the chitosan treated sample. The photonic nanospheres show an average diameter of 280 nm and display a face-centered cubic closepacking structure with an average thickness of 10 μm. A further chitosan post-treatment enhances color yield of the samples due to the chitosan transparent covering layer that induce bright reflections where the angles of incidence and reflection are the same. After washing, no photonic crystal can be detected on control fabric surface. However, the sample that received a chitosan post-treatment showed a good washing fastness maintaining a reasonable degree of iridescence. Chitosan fills the spaces between the polymer spheres in the matrix stabilizing the photonic structure. Sizeable variations in lattice spacing will allow color variations using more flexible non-close-packed photonic crystal arrays in chitosan hydrogels matrices.