Journal of Textile Research ›› 2022, Vol. 43 ›› Issue (12): 1-7.doi: 10.13475/j.fzxb.20220301907

• Fiber Materials •     Next Articles

Preparation and properties of flexible structural color film based on immobilization of liquid photonic crystals

GAO Yiping1, LI Yichen1,2, WANG Xiaohui1, LIU Guojin1,3, ZHOU Lan1,3, SHAO Min1,3, SHAO Jianzhong1,3()   

  1. 1. Engineering Research Center for Eco-Dyeing and Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. College of Textile and Clothing Engineering, Soochow University, Suzhou, Jiangsu 215021, China
    3. Key Laboratory of Advanced Textile Materials and Manufacturing Technology, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
  • Received:2022-03-04 Revised:2022-09-19 Online:2022-12-15 Published:2023-01-06
  • Contact: SHAO Jianzhong E-mail:jshao@zstu.edu.cn

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Abstract:

Aiming at the poor structural stability of photonic crystal materials, photo-curable flexible monomers were used to replace conventional assembly medium of water to prepare liquid photonic crystals. A non-close-packed photonic crystals array was built with SiO2 nanospheres embedded in an elastomer polymerized by UV-curing, to produce a flexible photonic crystals film with structural stability. The optical properties of liquid photonic crystals were regulated and controlled by the volume fraction of SiO2 nanospheres in the colloidal system and the particle size of SiO2 nanospheres. It is revealed that as the volume fraction of SiO2 nanospheres increases from 22% to 40%, the average spacing between the microspheres gradually decreases, and the structure color shifts to blue accordingly, while fixing the volume fraction of SiO2 nanospheres causes the structural color shifts to red when increasing the particle size of SiO2 nanospheres from 123 nm to 178 nm. The liquid photonic crystals show bright color with high saturation, and after ultraviolet irradiation the target product of solid photonic crystals film shows obvious iridescent effect and excellent flexibility. The results indicate excellent force-induced color change performance and a promising application potential in the field of smart wearable textile materials.

Key words: liquid photonic crystal, structural color, photo-curing, structural color film, flexibility, mechanochromic, textile substrate

CLC Number: 

  • TS193.5

Fig.1

Regulation of optical properties of SiO2/PHEA LPCs. (a) Optical photographs of LPCs with different φ S i O 2; (b) Reflectance spectra of LPCs with different φ S i O 2; (c) Optical photographs of LPCs with different particle sizes; (d) Reflectance spectra of LPCs with different particle sizes"

Fig.2

Dynamic recovery of LPCs. (a) Self-assembly process; (b) Schematic illustration of recovery transformation between reversibly disassembly and reassembly process; (c) Spectral changes during assembly; (d) Periodic changes of reflection intensities during reversibly disassembly and reassembly process"

Fig.3

Fabrication of SiO2/P(PHEA) photonic crystal film. (a) Schematic diagram of fabrication process; (b) Optical images of photonic crystal film with different SiO2 sizes; (c) Reflectance spectra of photonic crystal film with different SiO2 size"

Fig.4

SEM images of top-surface(a) and cross-section (b) of SiO2/P(PHEA) photonic crystals structure"

Fig.5

Mechanochromic properties of flexible photonic crystals film. (a) Optical images in different strains; (b) Mechanisms of mechanochromic; (c) Reflectance spectra in different strain; (d) Reflection wavelength variation at ten relaxation-tension cycles"

Fig.6

Iridescence effect of structurally colored fabric. (a) Schematic diagram of variable angle observation; (b) Optical images at different viewing angles; (c) Reflectance spectra at different viewing angles"

Fig.7

Structurally colored fabrics in curled (a) and stretched (b) state"

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