Temperature-driven oxygenation rate control by polymeric photosensitizer |
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| Authors: | Koizumi Hisao Shiraishi Yasuhiro Tojo Sachiko Fujitsuka Mamoru Majima Tetsuro Hirai Takayuki |
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| Institution: | Research Center for Solar Energy Chemistry and Division of Chemical Engineering, Graduate School of Engineering Science, Osaka University, Toyonaka, Osaka 560-8531, Japan. |
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| Abstract: | A polymeric photosensitizer, poly(NIPAM-co-BP), consisting of N-isopropylacrylamide (NIPAM) and benzophenone (BP) units, demonstrates a temperature-controlled oxygenation activity in water. The system promotes a heat-induced oxygenation enhancement at <17 degrees C and suppression at >22 degrees C. This unprecedented photo-oxygenation activity is triggered by a heat-induced phase transition of the polymer from coil to micelle, and then to globule state, cleverly controlling the stability and diffusion of singlet oxygen and the location of substrate. |
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