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Related Experiment Video

Updated: May 12, 2026

Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels
11:34

Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels

Published on: September 8, 2016

Tunable Structural Color in Copolymer Microgels Through Controlled Synthesis and Thermally Induced Assembly.

Manuel Kraus1, Mirela Malekovic1, Ionel Adrian Dinu1

  • 1Department of Chemistry University of Basel Basel Switzerland.

Small Science
|May 11, 2026
PubMed
Summary
This summary is machine-generated.

Researchers developed tunable structural colors using poly(N-isopropylacrylamide) (PNIPAm) microgels. These responsive materials change color with temperature or pH, enabling applications in sensors and optical tags.

Keywords:
colloidal assemblydynamic structural colorfunctional comonomerspoly(N‐isopropylacrylamide) (PNIPAm)‐based copolymer microgelstemperature‐ and pH‐responsiveness

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

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Area of Science:

  • Materials Science
  • Soft Matter Physics
  • Nanotechnology

Background:

  • Structural color in soft colloidal systems offers a route to stimuli-responsive photonic materials.
  • Poly(N-isopropylacrylamide) (PNIPAm) microgels are versatile building blocks for dynamic photonic applications.

Purpose of the Study:

  • To investigate the assembly of multifunctional PNIPAm-based microgels for dynamic structural color formation.
  • To tailor microgel properties (diameter, charge, swelling) by controlling comonomer composition and synthesis conditions.
  • To explore the relationship between microgel responsiveness and structural color tuning.

Main Methods:

  • Synthesis of copolymer microgels with varying anionic, neutral, and cationic comonomer percentages.
  • Surfactant-mediated size control and optimization of synthesis conditions.
  • Thermal colloidal assembly to form structural colors and modulation of interparticle spacing via microgel concentration and stimuli-responsiveness.

Main Results:

  • Libraries of copolymer microgels with precisely controlled particle diameter, surface charge, and stimuli-responsive swelling were obtained.
  • Structural colors tunable across the visible spectrum were achieved through thermal colloidal assembly.
  • Precise shifts in reflected color upon changes in temperature or pH were observed, particularly in anionic and neutral microgel assemblies.

Conclusions:

  • Microgel responsiveness and compressibility are key factors in structural color formation.
  • Anionic and neutral microgel assemblies facilitate observable color shifts, unlike amorphous cationic microgel assemblies.
  • The findings support the development of advanced multifunctional colloidal sensors, coatings, and optical tags.