Photo-triggered microgel aggregation using <i>o</i> -nitrobenzaldehyde as aggregating power source

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  • Shingo Tamesue
    Graduate School of Science and Technology; Niigata University; Ikarashi 2-8050 Nishi-Ku Niigata 950-2181 Japan
  • Shinji Abe
    Graduate School of Science and Technology; Niigata University; Ikarashi 2-8050 Nishi-Ku Niigata 950-2181 Japan
  • Tetsu Mitsumata
    Graduate School of Science and Technology; Niigata University; Ikarashi 2-8050 Nishi-Ku Niigata 950-2181 Japan
  • Norio Tsubokawa
    Department of Material Science and Technology, Faculty of Engineering; Niigata University; Ikarashi 2-8050 Nishi-Ku Niigata 950-2181 Japan
  • Takeshi Yamauchi
    Graduate School of Science and Technology; Niigata University; Ikarashi 2-8050 Nishi-Ku Niigata 950-2181 Japan

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In this work, cationic and anionic microgels which are mainly formed from thermal responsive polymer, poly(N-isopropylacrylamide), are prepared and mixed in water. These microgels interact with each other due to the electrostatic interaction, and aggregate voluntarily. By applying the microgel aggregating system, photo-responsive aggregating system is constructed by using o-nitrobenzaldehyde (NBA), which reacts and releases hydrogen triggered by photo stimuli. The microgel aggregates in an aqueous solution of NBA re-disperse depending on the irradiation time of UV light. In addition, by masking the UV irradiated area, the resultant shapes of microgel aggregates are controlled. The aggregated microgel shows rapid and drastic volume changes in response to heat. © 2015 Wiley Periodicals, Inc. J. Polym. Sci., Part A: Polym. Chem. 2015

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