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Related Experiment Video

Updated: Jun 28, 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

Structural ordering and phase behavior of charged microgels.

P S Mohanty, W Richtering

    The Journal of Physical Chemistry. B
    |October 28, 2008
    PubMed
    Summary
    This summary is machine-generated.

    This study experimentally verifies theoretical predictions of re-entrant phase transitions in ionic microgels, observing fluid-FCC-BCC-fluid behavior with increasing concentration. These findings confirm screened Coulomb interactions in colloidal dispersions.

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    Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
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    Last Updated: Jun 28, 2026

    Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels
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    Published on: September 8, 2016

    Thermal Scanning Conductometry (TSC) as a General Method for Studying and Controlling the Phase Behavior of Conductive Physical Gels
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    Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy
    10:08

    Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

    Published on: October 24, 2017

    Area of Science:

    • Colloid and Surface Science
    • Polymer Chemistry
    • Soft Matter Physics

    Background:

    • Theoretical models predicted re-entrant order-disorder transitions (fluid-FCC-BCC-fluid) in ionic microgels, but lacked experimental verification.
    • Ionic microgels, specifically poly(N-isopropylacrylamide co acrylic acid) (PNIPAm-co-AAc), with low monomer volume fractions were investigated.
    • Static and dynamic light scattering techniques were employed to study microgel dispersions across a wide concentration range (0.02-0.6 wt %).

    Discussion:

    • The experimental results align with theoretical predictions, demonstrating a fluid-FCC-BCC-fluid phase behavior as concentration increases.
    • The interaction potential between microgel particles was identified as screened Coulomb repulsion within the studied concentration ranges.
    • Observed glass transition at higher concentrations (approx. 0.57 wt %) provides further insight into the complex phase behavior.

    Key Insights:

    • Experimental validation of the re-entrant order-disorder transition in ionic microgels.
    • Confirmation of screened Coulomb interactions governing microgel particle behavior.
    • Identification of distinct ordered phases (FCC, potential BCC/FCC coexistence) and disordered states (liquid, glass).

    Outlook:

    • Further investigation into the BCC phase and its coexistence with FCC is warranted.
    • Exploring the influence of varying microgel properties (e.g., cross-linking density, charge density) on phase behavior.
    • Potential applications in designing advanced materials with tunable properties based on microgel self-assembly.