Chromogenic double inverse opals photonic crystal resin film using water as ink and the preparation thereof

US12286494B2 · kind B2 · utility

Assignee

• Dalian University of Technology · CN

Inventors

• Shufen Zhang · 东风镇, CN
• Changtong Zhou · 东风镇, CN
• Wenbin Niu · 东风镇, CN
• Wei Ma · Shanghai, CN
• Bingtao Tang · 东风镇, CN
• Suli Wu · 东风镇, CN

Key dates

• Filing date: Oct 5, 2022
• Grant date: Apr 29, 2025
• Expiry date: Nov 30, 2043

Classification

• Technology area (CPC C): Chemistry; Metallurgy
• CPC primary: C08F222/1063
• WIPO field: Macromolecular chemistry, polymers
• WIPO sector: Chemistry

Abstract

A double-inverse opal photonic crystal resin film is formed by embedding nanospheres in pores of polyacrylate inverse opal framework material and then filling the pores of the double-inverse opal photonic crystal resin film with an ethanol solution with hydrophilic acrylamide dissolved therein followed by photopolymerization to form a polyacrylamide network, so as to obtain the double-inverse opal photonic crystal resin film using water as ink. A mass fraction of hydrophilic acrylamide in the ethanol solution is 2 to 8 wt. %. The resin film can induce water to penetrate into the pores of the double-inverse opal photonic crystal resin film, making the nanospheres in the pores of the inverse opal framework distribute from random to order under the action of buoyancy force, thereby eliminating scattering interference and producing brilliant structural colors by regulating refractive index contrast.