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Facile Preparation of Internally Self-assembled Lipid Particles Stabilized by Carbon Nanotubes

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Structured Liquid-in-Liquid Emulsion Stabilized by Surface-Engineered Liquid Metal Droplets as "Mutant" Pickering

Jiyoon Park¹, Hyunji Lee¹, Eunju Na¹

¹Department of Chemical Engineering, Myongji University, Yongin 17058, Republic of Korea.

ACS Applied Materials & Interfaces

|January 28, 2025

Summary

This summary is machine-generated.

Engineered liquid metal (LM) microdroplets act as novel "mutant" Pickering emulsifiers, creating stable oil-in-water emulsions. These liquid metal emulsions offer enhanced properties and localized photothermal heating for diverse applications.

Keywords:

EGaIn Pickering emulsion liquid metal photothermal conversion rheology stability surface engineering

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Area of Science:

Materials Science
Colloid and Surface Chemistry
Nanotechnology

Background:

Liquid metals (LMs) possess unique electronic and rheological properties, driving interest in advanced technologies.
Conventional Pickering emulsifiers utilize solid particles to stabilize emulsions; a liquid-core alternative is explored.

Purpose of the Study:

To engineer liquid metal (LM) microdroplets as novel droplet-type surfactants for stabilizing liquid-in-liquid emulsions.
To investigate the properties and applications of emulsions stabilized by these engineered LM droplets.

Main Methods:

Eutectic gallium-indium (EGaIn) microdroplets were encapsulated with SiO2 and functionalized with cetyltrimethylammonium bromide (CTAB).
These engineered LM droplets were used to create oil-in-water (O/W) emulsions, termed "mutant" Pickering emulsifiers.
The emulsions' stability, viscoelasticity, photothermal properties, and cargo release capabilities were evaluated.

Main Results:

The engineered LM droplets demonstrated high chemical stability and excellent oil-water interfacial activity.
Stable O/W emulsions with enhanced yield stress, viscoelasticity, and sedimentation stability were produced, even at low LM concentrations.
Localized photothermal heating and on-demand cargo release were achieved using these LM-stabilized emulsions.

Conclusions:

Engineered liquid metal microdroplets function as effective "mutant" Pickering emulsifiers, creating stable and functional emulsions.
These novel emulsions exhibit tunable properties, including viscoelasticity and photothermal responsiveness, with significant application potential.
This work introduces a new class of colloidal systems with liquid cores for advanced materials and delivery systems.