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Synthesis of Stimuli-responsive Nanogels using Aqueous One-step Crosslinking and Co-nanopolymerization

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Multi-Stimuli-Responsive Polymer/Inorganic Janus Composite Nanoparticles.

Xi Chen^1,2, Zhangyan Chen³, Li Ma^1,2

¹Department of Materials Science, Fudan University, Shanghai 200433, China.

Langmuir : the ACS Journal of Surfaces and Colloids

|December 28, 2021

Summary

This summary is machine-generated.

Researchers developed novel multi-stimuli-responsive Janus composite nanoparticles (JNPs). These nanoparticles, responsive to pH, temperature, and magnetic fields, can act as tunable solid emulsifiers for advanced material applications.

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Area of Science:

Materials Science
Nanotechnology
Polymer Chemistry

Background:

Janus composite nanoparticles (JNPs) offer tunable surface properties for advanced applications.
Stimuli-responsive materials are crucial for developing smart systems.
Controlled emulsification is vital in various industrial processes.

Purpose of the Study:

To synthesize multi-stimuli-responsive Janus composite nanoparticles (JNPs).
To investigate the tunable hydrophilic/amphiphilic/hydrophobic transitions of JNPs.
To explore the application of JNPs as responsive solid emulsifiers.

Main Methods:

Sequential reversible addition-fragmentation chain-transfer (RAFT) and atom-transfer radical polymerization (ATRP) grafting.
Synthesis of poly(N-isopropylacrylamide)-Fe3O4-poly(2-(dimethylamino)ethyl methacrylate) (PNIPAM-Fe3O4-PDMEAMA) JNPs.
Characterization of JNP responsiveness to pH, temperature, and near-infrared (NIR) irradiation.

Main Results:

Successfully synthesized PNIPAM-Fe3O4-PDMEAMA JNPs with tunable wettability.
Demonstrated reversible hydrophilic/amphiphilic/hydrophobic transitions triggered by pH and temperature.
Observed NIR-induced amphiphilic/hydrophobic transition due to the photothermal effect of Fe3O4 NPs.
Showcased JNP capability as responsive solid emulsifiers with stimuli-controlled stability and microstructure.

Conclusions:

The synthesized JNPs exhibit multi-stimuli responsiveness, enabling precise control over their properties.
These JNPs are effective as solid emulsifiers, with emulsion characteristics tunable by external stimuli.
The findings open avenues for developing advanced responsive materials and controlled emulsion systems.