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ACS applied materials & interfaces v.9 no.2, 2017년, pp.1810 - 1819   SCI SCIE
본 등재정보는 저널의 등재정보를 참고하여 보여주는 베타서비스로 정확한 논문의 등재여부는 등재기관에 확인하시기 바랍니다.

Photoinitiation and Inhibition under Monochromatic Green Light for Storage of Colored 3D Images in Holographic Polymer-Dispersed Liquid Crystals

Chen, Guannan (Department of Physics and Materials Science, City University of Hong Kong, Tat Chee Avenue, Kowloon Tong, Hong Kong SAR, ) ; Ni, Mingli ; Peng, Haiyan ; Huang, Feihong ; Liao, Yonggui ; Wang, Mingkui ; Zhu, Jintao ; Roy, V. A. L. ; Xie, Xiaolin ;
  • 초록  

    Holographic photopolymer composites have garnered a great deal of interest in recent decades, not only because of their advantageous light sensitivity but also due to their attractive capabilities of realizing high capacity three-dimensional (3D) data storage that is long-term stable within two-dimensional (2D) thin films. For achieving high performance holographic photopolymer composites, it is of critical importance to implement precisely spatiotemporal control over the photopolymerization kinetics and gelation during holographic recording. Though a monochromatic blue light photoinitibitor has been demonstrated to be useful for improving the holographic performance, it is impractical to be employed for constructing holograms under green light due to the severe restriction of the First Law of Photochemistry, while holography under green light is highly desirable considering the relatively low cost of laser source and high tolerance to ambient vibration for image reconstruction. Herein, we disclose the concurrent photoinitiation and inhibition functions of the rose bengal (RB)/ N -phenylglycine (NPG) system upon green light illumination, which result in significant enhancement of the diffraction efficiency of holographic polymer-dispersed liquid crystal (HPDLC) gratings from zero up to 87.6 ± 1.3%, with an augmentation of the RB concentration from 0.06 × 10 –3 to 9.41 × 10 –3 mol L –1 . Interestingly, no detectable variation of the ϕ 1/2 k p / k t 1/2 , which reflects the initiation efficiency and kinetic constants, is given when increasing the RB concentration. The radical inhibition by RBH • is believed to account for the greatly improved phase separation and enhanced diffraction efficiency, through shortening the weight-average polymer chain length and subsequently delaying the photopolymerization gelation. The reconstructed colored 3D images that are easily identifiable to the naked eye under white light demonstrate great potential to be applied for advanced anticounterfeiting. Graphic Abstract ACS Electronic Supporting Info


  • 주제어

    photopolymerization .   inhibition .   holography .   green light .   rose bengal .   anticounterfeiting.  

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