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

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Anisotropic mesoporous silica/microgel core-shell responsive particles.

Julien Schmitt^1,2, Caroline Hartwig¹, Jérôme J Crassous^1,3

¹Division of Physical Chemistry, Department of Chemistry, Lund University 221 00 Lund Sweden.

|May 6, 2022

Summary

Researchers developed hybrid anisotropic microgels with tunable shapes using mesoporous silica cores and poly(N-isopropylacrylamide) shells. These thermo-responsive materials exhibit controlled swelling and respond to electric fields, showing potential for advanced applications.

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Synthesis and Characterization of Supramolecular Colloids

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Published on: April 22, 2016

Area of Science:

Materials Science
Polymer Chemistry
Nanotechnology

Background:

Microgels offer tunable properties but often lack defined anisotropic structures.
Mesoporous silica provides a versatile platform for creating well-defined core particles.
Combining inorganic cores with responsive polymer shells can lead to advanced hybrid materials.

Purpose of the Study:

To synthesize hybrid anisotropic microgels with mesoporous silica cores and poly(N-isopropylacrylamide) shells.
To control the shape of the core particles (platelets, rods, primary particles) and characterize the resulting hybrid microgels.
To investigate the thermo-responsive behavior and electric field response of these novel hybrid microgels.

Main Methods:

Synthesis of mesoporous silica core particles with controlled shapes.
Precipitation polymerization of N-isopropylacrylamide (PNIPAM) onto silica cores to form hybrid microgels.
Characterization using Small Angle X-ray Scattering (SAXS), Dynamic Light Scattering (DLS), Cryogenic Transmission Electron Microscopy (cryo-TEM), and Confocal Laser Scanning Microscopy (CLSM).

Main Results:

Successfully synthesized hybrid anisotropic microgels with distinct core-shell structures.
Demonstrated control over core particle morphology (platelets, rods, primary particles).
Observed thermo-responsive swelling behavior and confirmed electric field responsiveness in rod-shaped hybrid microgels.

Conclusions:

Hybrid anisotropic microgels with tunable shapes and thermo-responsive properties were successfully fabricated.
The core-shell architecture and morphology significantly influence the material's response.
These hybrid microgels show promise for applications requiring stimuli-responsive and shape-controlled nanomaterials.