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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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Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control

Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control

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Creating nanoscale emulsions using condensation.

Ingrid F Guha¹, Sushant Anand^2,3, Kripa K Varanasi⁴

¹Department of Electrical Engineering and Computer Science, Massachusetts Institute of Technology, Cambridge, MA, 02139, USA.

Nature Communications

|November 10, 2017

Summary

A new method creates nanoscale water-in-oil emulsions using water vapor condensation. This scalable, bottom-up approach offers precise control over emulsion size and stability for diverse applications.

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Area of Science:

Colloid and Surface Science
Materials Science
Chemical Engineering

Background:

Nanoscale emulsions are crucial for food and drug delivery.
Current methods involve droplet breakup or solvent exchange.
A need exists for simpler, scalable emulsion formation techniques.

Purpose of the Study:

To develop a novel, scalable method for creating nanoscale water-in-oil emulsions.
To investigate the mechanism of emulsion formation via water vapor condensation.
To understand how surfactant concentration influences emulsion characteristics.

Main Methods:

Utilizing water vapor condensation onto a subcooled oil-surfactant solution.
Employing oil-soluble surfactants for emulsion stabilization.
Analyzing droplet size, polydispersity, and stability.

Main Results:

Achieved nanoscale emulsions with peak radii around 100 nm.
Obtained emulsions with low polydispersity (around 10%).
Demonstrated control over emulsion properties via oil-surfactant concentration.

Conclusions:

Condensation offers a scalable, bottom-up approach to emulsion formation.
This technique provides a new route for creating emulsions and colloidal systems.
Potential applications in materials science and advanced formulations.