15 October 2012 Diffusion of dye solution in the intermolecular nanostructure of polydimethylsiloxane
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Polydimethylsiloxane (PDMS) contains a large, flexible free space between weakly-bonded molecules, which allows notable molecular diffusion. A toluene solution of diarylethene (photochromic dye) was mixed with a PDMS oil, and then the mixture was cured in a glass vessel by adding a curing agent. Violet laser (405 nm wavelength) irradiation induced an absorption band at around 530 nm, and consequently, the irradiated portion exhibited a red color. The colored portion gradually expanded to the entire sample because of diffusion of the dye molecules. This diffusion characteristic was used for improving an organic dye durability against a photo-induced degradation.
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Mitsunori Saito, Mitsunori Saito, Tatsuya Nishimura, Tatsuya Nishimura, Kohei Sakiyama, Kohei Sakiyama, Michinori Nakagawa, Michinori Nakagawa, } "Diffusion of dye solution in the intermolecular nanostructure of polydimethylsiloxane", Proc. SPIE 8456, Nanophotonic Materials IX, 84560M (15 October 2012); doi: 10.1117/12.928339; https://doi.org/10.1117/12.928339

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