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Effects of pH and temperature on assembly of multiresponsive Janus microgels

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Abstract

Multiresponsive behaviors of Janus microgels whose properties of both hemispheres are different are presented. We fabricated the multiresponsive Janus microgels by post-polymerization modification at an oil/water interface. To prevent the microgels from wobbling at the interface during the modification process, oil droplets stabilized by microgels were solidified by cooling. Temperature- and pH-responsive behaviors of Janus microgels were characterized both by dynamic light scattering and by optical microscopy. By changing temperature and pH, behaviors of Janus microgels could be controlled; they dispersed individually or assembled into specific structures. The stimuli-responsive behaviors of Janus microgels may be used as microactuators or candidates in developing more precisely controlled particle clusters.

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Acknowledgment

D.S. acknowledges Prof. Haruma Kawaguchi of Kanagawa University for permitting us to continue this research. D.S. acknowledges Grant-in-Aid for Young Scientists (A) from the Ministry of Education, Culture, Sports, Science, and Technology of Japan (22685024). This work was partially supported by MEXT’s program “Promotion of Environmental Improvement for Independence of Young Researchers” under the Special Coordination Funds for Promoting Science and Technology.

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Authors and Affiliations

  1. Faculty of Textile Science & Technology, Shinshu University, 3-15-1, Tokida, Ueda, Nagano, 386-8567, Japan

    Yoshitaka Umeda, Takeshi Kobayashi, Toshihiro Hirai & Daisuke Suzuki

  2. International Young Researchers Empowerment Center, Shinshu University, 3-15-1, Tokida, Ueda, Nagano, 386-8567, Japan

    Daisuke Suzuki

Authors
  1. Yoshitaka Umeda
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  2. Takeshi Kobayashi
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  3. Toshihiro Hirai
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  4. Daisuke Suzuki
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Correspondence to Daisuke Suzuki.

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Umeda, Y., Kobayashi, T., Hirai, T. et al. Effects of pH and temperature on assembly of multiresponsive Janus microgels. Colloid Polym Sci 289, 729–737 (2011). https://doi.org/10.1007/s00396-010-2356-x

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  • DOI: https://doi.org/10.1007/s00396-010-2356-x

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