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Colloids

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Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...

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Updated: Jul 27, 2025

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Stabilizing oil-oil interfaces with mixed-shell polymeric nanoparticles prepared

Xi Zhao^1,2, Jiani Peng¹, Liangliang Shi¹

¹Jiangsu Key Laboratory of Environmentally Friendly Polymeric Materials, Jiangsu Collaborative Innovation Centre of Photovoltaic Science and Engineering, School of Materials Science and Engineering, Changzhou University, Changzhou, 213164, Jiangsu Province, China. gydx.1027@163.com.

|June 7, 2023

Summary

This study prepared mixed-shell polymeric nanoparticles (MSPNs) that effectively stabilize non-aqueous Pickering emulsions. These novel MSPNs demonstrate superior performance over precursor nanoparticles for oil-oil interface stabilization.

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Published on: January 25, 2018

Area of Science:

Polymer Chemistry
Materials Science
Colloid and Surface Science

Background:

Polymeric nanoparticles are versatile building blocks for advanced materials.
Pickering emulsions offer an alternative to conventional emulsions stabilized by surfactants.
Stabilizing non-aqueous oil-oil interfaces presents unique challenges.

Purpose of the Study:

To synthesize and characterize mixed-shell polymeric nanoparticles (MSPNs).
To investigate the efficacy of MSPNs as Pickering emulsifiers for non-aqueous oil-oil emulsions.
To elucidate the formation mechanisms of these emulsions.

Main Methods:

Reversible addition-fragmentation chain transfer (RAFT) polymerization induced self-assembly (PISA) to create PMMA-P4VP diblock copolymer nanoparticles.
Grafting C18 alkyl chains onto nanoparticle surfaces to form MSPNs.
Utilizing MSPNs to stabilize [Bmim][PF6]-in-toluene and toluene-in-[Bmim][PF6] Pickering emulsions.

Main Results:

PMMA-P4VP nanoparticles with spherical, worm-like, and vesicular morphologies were successfully synthesized.
C18/PMMA-P4VP MSPNs were prepared with a P4VP core and a mixed C18/PMMA shell.
MSPNs effectively stabilized two distinct types of non-aqueous Pickering emulsions, whereas precursor nanoparticles did not.
The initial location of MSPNs dictated the emulsion type ([Bmim][PF6]-in-toluene or toluene-in-[Bmim][PF6]).

Conclusions:

MSPNs exhibit enhanced capabilities in stabilizing non-aqueous oil-oil interfaces compared to their diblock copolymer precursors.
The tailored shell structure of MSPNs is crucial for their effectiveness as Pickering emulsifiers.
This work provides a pathway for designing advanced Pickering emulsions with tunable properties.