Chen, G., Ni, M., Peng, H., Huang, F., Liao, Y., Wang, M., Zhu, J., Roy, V.A.L. and Xie, X. (2017) Photoinitiation and inhibition under monochromatic green light for storage of colored 3D images in holographic polymer-Ddspersed liquid crystals. ACS Applied Materials and Interfaces, 9(2), pp. 1810-1819. (doi: 10.1021/acsami.6b13129) (PMID:28001037)
Full text not currently available from Enlighten.
Abstract
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 ϕ1/2kp/kt1/2, 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.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Vellaisamy, Professor Roy |
| Authors: | Chen, G., Ni, M., Peng, H., Huang, F., Liao, Y., Wang, M., Zhu, J., Roy, V.A.L., and Xie, X. |
| College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
| Journal Name: | ACS Applied Materials and Interfaces |
| Publisher: | American Chemical Society |
| ISSN: | 1944-8244 |
| ISSN (Online): | 1944-8252 |
| Published Online: | 05 January 2017 |
| Related URLs: |
University Staff: Request a correction | Enlighten Editors: Update this record
Deposit and Record Details
Deposit and Record Details