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Controlled Synthesis and Fluorescence Tracking of Highly Uniform PolyN-isopropylacrylamide Microgels
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Ultra-Low-Cross-Linked Microgels Reveal Unexpected Dynamics in Overcrowded Conditions.

Nikolaos A Burger1, Alexander V Petrunin2, Ann E Terry3

  • 1Division of Physical Chemistry, Lund University, SE-22100 Lund, Sweden.

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Ultralow-cross-linked microgels exhibit unique rheological properties, behaving like critical gels and showing a solid-liquid transition. This makes them valuable soft nanocolloids for studying complex fluid dynamics.

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Area of Science:

  • Soft Matter Physics
  • Colloidal Science
  • Rheology

Background:

  • Microgels are model systems for soft colloidal suspensions.
  • Understanding structure-rheology relationships is crucial for soft matter applications.
  • Ultralow-cross-linked (ULC) microgels offer unique properties due to their ultrasoft corona.

Purpose of the Study:

  • To synthesize and characterize ultralow-cross-linked (ULC) microgels.
  • To investigate the rheological behavior of ULC microgel suspensions under crowded conditions.
  • To explore the potential of ULC microgels as model systems for biological materials.

Main Methods:

  • Precipitation polymerization to synthesize ULC and regular cross-linked (RC) microgels.
  • Linear viscoelastic measurements (G' ~ G″ ~ ω^n).
  • Large-amplitude oscillatory shear and stress-shear strain rate measurements.

Main Results:

  • ULC microgel suspensions display critical-like gel behavior in crowded conditions.
  • A solid-liquid transition without a G″ overshoot was observed during yielding.
  • Shear-thinning behavior (σ ~ γ̇^~0.25) was evident at low shear rates.
  • Rheological response attributed to a balance of polymeric and colloidal forces.

Conclusions:

  • ULC microgels demonstrate emergent soft nanocolloid behavior.
  • Their rheological properties are relevant for understanding biological systems, like cell membranes.
  • ULC microgels serve as valuable model systems for soft matter research.