Journal
OPTICAL MATERIALS
Volume 57, Issue -, Pages 107-113Publisher
ELSEVIER SCIENCE BV
DOI: 10.1016/j.optmat.2016.04.027
Keywords
Photonic crystal; Hydrogel colloids; Silica colloids; Dual-reflex
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Funding
- National High Technology Research and Development Program of China (863 Program) [2012AA030313]
- National Natural Science Foundation of China [21076103, 21474052]
- Natural Science Foundation of Jiangsu Province [BK20140934]
- Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD)
- Qing Lan Project
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An operable strategy for the construction of dual-reflex optical code materials from bilayer or Janus structure colloidal photonic crystals (CPCs) has been established in this work. In this process, mono dispersed submicrometer polystryene@poly(2-hydroxyethyl methacrylate-co-acrylic acid) hydrogel microspheres with soft-shell/hard-core structure and monodispersed colloidal silica spheres were fabricated. These two kinds of colloidal units can be facilely integrated into a single material without optical signal interference because they are well isolated for the immiscibility between water and ethoxylated trimethylolpropane triacrylate (TMPTA) and the upper layer of SiO2-TMPTA is a kind of transparent. Moreover, diverse optical code series with different dual photonic bandgaps can be obtained via tuning the colloid sizes. Compared to the conventional single-reflex CPCs, the as-prepared dual-reflex optical code materials represented high information capacity in encoding process. More interesting, delicate code pattern has been also achieved on the optical film via the silk-screen printing technique, which will greatly extend the dual-reflex optical code materials to practical uses in areas containing bio-encoding, anti-counterfeiting, and flexible displays. (C) 2016 Elsevier B.V. All rights reserved.
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