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- W2002199337 abstract "Abstract In this study, it is shown that the kinetics of the back‐switching reaction of a photochromic spirooxazine dye encapsulated in mesoporous silica materials can be significantly influenced both by the space available to the dye molecules and by the functionalization of the silica wall. Steric hindrance of the ring‐closing process due to high dye content or small pore size leads to a slow fading speed of the irradiated dye species. Further, the density of surface silanol‐groups present at the silica walls has an effect on the switching behavior of the dye because of their ability to stabilize the zwitterionic merocyanine isomers, thereby slowing the fading process from the open to the closed form. This stabilization effect is further enhanced in the presence of acidic functional groups, while, in contrast, basic functional groups reduce the stabilization of the open‐from dye isomers, and thus a faster decay of the irradiated species is observed. Control over the fading speed of photochromic dyes is interesting for applications requiring a particularly fast or slow fading speed." @default.
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- W2002199337 date "2009-07-06" @default.
- W2002199337 modified "2023-09-30" @default.
- W2002199337 title "Tuning the Thermal Relaxation of a Photochromic Dye in Functionalized Mesoporous Silica" @default.
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- W2002199337 doi "https://doi.org/10.1002/adfm.200801619" @default.
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