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Magnetic and Thermal-sensitive Poly(N-isopropylacrylamide)-based Microgels for Magnetically Triggered Controlled Release08:39

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We present a protocol to synthesize Janus microhydrogels composed entirely of the same base material, poly(N-isopropylacrylamide) (PNIPAAm), with a clearly compartmentalized structure base on the phase separation of a supersaturated NIPAAm monomer solution. The synthesized Janus microhydrogels show unique properties such as anisotropic thermo-responsiveness and organophilic/hydrophilic loading...
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Magnetic and Thermal-sensitive PolyN-isopropylacrylamide-based Microgels for Magnetically Triggered Controlled Release
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Rapidly Responding pH- and Temperature-Responsive Poly (N-Isopropylacrylamide)-Based Microgels and Assemblies.

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Responsive microgels modified with butylacrylic acid (BAAc) show significantly faster response times. Increased hydrophobicity of the acid pendant group in N-isopropylacrylamide (NIPAm)-based microgels correlates with quicker temperature and pH response kinetics.

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Synthesis of PolyN-isopropylacrylamide Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability
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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Stimuli-responsive materials offer advantages in sensing, actuation, and drug delivery.
  • Thermo- and pH-responsive materials are widely studied for applications at physiological conditions.
  • Acrylic acid (AAc)-based monomers can be incorporated into N-isopropylacrylamide (NIPAm)-based microgels to tune responsiveness.

Purpose of the Study:

  • To investigate the effect of varying acrylic acid pendant group lengths on the response kinetics of NIPAm-based microgels.
  • To correlate material hydrophobicity with response speed in stimuli-responsive microgel devices.
  • To develop fast-responding materials for sensing and drug delivery applications.

Main Methods:

  • Synthesis of NIPAm-based microgels incorporating a homologous series of acrylic acids (AAc, MAAc, EAAc, BAAc).
  • Characterization of microgels using optical microscopy and dynamic light scattering.
  • Fabrication of optical etalon devices using modified microgels and evaluation of their temperature and pH response.

Main Results:

  • Butylacrylic acid (BAAc)-modified microgel devices exhibited the fastest response kinetics.
  • Response speed decreased with decreasing length of the acid pendant group, with AAc-modified devices being the slowest.
  • Temperature response kinetics also decreased with shorter pendant groups, suggesting a link to hydrophobicity.

Conclusions:

  • Increased hydrophobicity of acrylic acid pendant groups in NIPAm-based microgels leads to faster response kinetics.
  • The findings enable the rational design of advanced stimuli-responsive materials with tailored response times.
  • This research paves the way for improved performance in applications like biosensing and drug delivery systems.