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J Am Chem Soc. 2014 Jun 25;136(25):8855-8. doi: 10.1021/ja502366r. Epub 2014 Jun 16.

Monochromatic visible light "photoinitibitor": Janus-faced initiation and inhibition for storage of colored 3D images.

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State Key Laboratory of Materials Processing and Die & Mold Technology, School of Chemistry and Chemical Engineering, Huazhong University of Science and Technology , Wuhan 430074, China.


Controlling the kinetics and gelation of photopolymerization is a significant challenge in the fabrication of complex three-dimensional (3D) objects as is critical in numerous imaging, lithography, and additive manufacturing techniques. We propose a novel, visible light sensitive "photoinitibitor" which simultaneously generates two distinct radicals, each with their own unique purpose-one radical each for initiation and inhibition. The Janus-faced functions of this photoinitibitor delay gelation and dramatically amplify the gelation time difference between the constructive and destructive interference regions of the exposed holographic pattern. This approach enhances the photopolymerization induced phase separation of liquid crystal/acrylate resins and the formation of fine holographic polymer dispersed liquid crystal (HPDLC) gratings. Moreover, we construct colored 3D holographic images that are visually recognizable to the naked eye under white light.

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