Reversible absorption of CO 2 triggered by phase transition of amine-containing micro- and nanogel particles

Yu Hoshino, Kazushi Imamura, Mengchen Yue, Gen Inoue, Yoshiko Miura

研究成果: Contribution to journalArticle査読

84 被引用数 (Scopus)


Herein we report that an aqueous solution of temperature-responsive micro- and nanogel particles (GPs) consisting of N-isopropylacrylamide (NIPAm) and N-[3-(dimethylamino)propyl]methacrylamide (DMAPM) reversibly absorbs and desorbs CO 2 via a phase transition induced by cooling and heating cycles (30-75 °C). Below the phase-transition temperature, most of the amines in the swollen GPs are capable of forming ion pairs with absorbed bicarbonate ions. However, above the phase-transition temperature, shrinkage of the GPs lowers the pK a and the number of amine groups exposed to water, thereby resulting in almost complete desorption of CO 2 . The GPs can reversibly absorb more than the DMAPM monomer and polymer without NIPAm, which indicates the importance of the temperature-responsive phase transition of polymers in determining the degree of absorption. The results show the potential of temperature-responsive polymer solutions as absorbents to sequester CO 2 at a low energy cost.

ジャーナルJournal of the American Chemical Society
出版ステータス出版済み - 11 7 2012

All Science Journal Classification (ASJC) codes

  • Catalysis
  • Chemistry(all)
  • Biochemistry
  • Colloid and Surface Chemistry

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