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Colloids

Colloids

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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Water-in-Water Emulsions Stabilized by Nanoplates.

Mark Vis¹, Joeri Opdam¹, Ingo S J van 't Oor¹

¹Van 't Hoff Laboratory for Physical and Colloid Chemistry, Debye Institute for Nanomaterials Science, Utrecht University, Padualaan 8, 3584 CH Utrecht, The Netherlands.

ACS Macro Letters

|May 21, 2022

Summary

This summary is machine-generated.

Ultrathin plate-like particles offer superior Pickering stabilization for water-in-water emulsions. Their unique shape efficiently blocks interfaces, enhancing adsorption strength compared to spherical particles.

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Area of Science:

Colloid and Surface Science
Materials Science

Background:

Pickering stabilization is crucial for emulsions, but water-in-water interfaces present unique challenges due to their thickness and ultralow tension.
Traditional spherical particles face limitations in effectively stabilizing these complex interfaces.

Purpose of the Study:

To investigate the efficacy of ultrathin, plate-like colloidal particles for stabilizing water-in-water emulsions.
To analyze the influence of particle geometry on interfacial coverage and adsorption strength.

Main Methods:

Utilizing ultrathin, plate-like colloidal particles as stabilizers.
Analyzing particle adsorption behavior at the water-water interface.
Comparing stabilization efficiency with spherical particles.

Main Results:

Ultrathin plate-like particles demonstrate effectiveness in Pickering stabilization of water-in-water emulsions.
These particles efficiently block a significant portion of the interface with low mass.
Interfacial blockage is largely independent of the contact angle, leading to stronger adsorption than spheres (except at 90°).

Conclusions:

Plate-like colloidal particles are highly promising for stabilizing challenging water-in-water emulsions.
The geometry of particles significantly impacts their performance in Pickering stabilization.
The findings suggest a new avenue for designing advanced emulsion systems.