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Related Experiment Video

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Synthesis of Stimuli-responsive Nanogels using Aqueous One-step Crosslinking and Co-nanopolymerization
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Phototropic Multiresponsive Active Nanogels.

Issei Otsuka1,2, Xuewei Zhang2, Françoise M Winnik2,3,4

  • 1Université Grenoble Alpes, CNRS, CERMAV, CS40700, 38041, Grenoble Cedex 9, France.

Macromolecular Rapid Communications
|November 12, 2019
PubMed
Summary
This summary is machine-generated.

Responsive nanogels were created using RAFT polymerization. These nanogels, functionalized with spiropyran, exhibit light-directed movement, offering potential for advanced materials.

Keywords:
active mattercollective motionmulti-stimuli-responsivenessnano/microgelsself-assembly

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Stimuli-responsive nanogels are crucial for advanced materials.
  • Controlling nanogel properties with environmental factors like pH and temperature is key.
  • Photo-responsive materials offer unique control mechanisms.

Purpose of the Study:

  • To synthesize novel pH- and temperature-responsive nanogels.
  • To incorporate photochromic spiropyran moieties for light responsiveness.
  • To investigate the light-directed collective motion of these functionalized nanogels.

Main Methods:

  • Reversible addition-fragmentation chain-transfer (RAFT) polymerization-induced thermal self-assembly (PITSA) of N-isopropylacrylamide (NIPAM).
  • Incorporation of poly(methacrylic acid) (PMAA) and a cross-linker.
  • Coupling of photochromic spiropyran (SP) to nanogel carboxylic acid groups.

Main Results:

  • Synthesized nanogels exhibit changes in hydrodynamic radius and ζ-potential with pH and temperature.
  • Spiropyran moieties isomerize from neutral SP to zwitterionic merocyanine (ME) upon UV irradiation.
  • Microgels formed by SP nanogels show collective motion towards the UV light source.

Conclusions:

  • Successfully developed dual (pH/temperature) and photo-responsive nanogels.
  • Demonstrated light-induced collective motion of spiropyran-functionalized nanogels.
  • These findings open avenues for light-controlled nanogel-based systems and actuators.