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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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Synthesis and Characterization of Supramolecular Colloids

Synthesis and Characterization of Supramolecular Colloids

Published on: April 22, 2016

Biocompatible Amphiphilic Hydrogel-Solid Dimer Particles as Colloidal Surfactants.

Dong Chen, Esther Amstad, Chun-Xia Zhao¹

¹Australian Institute for Bioengineering and Nanotechnology, The University of Queensland , St. Lucia, QLD 4072, Australia.

|December 5, 2017

Summary

Researchers created novel biocompatible amphiphilic dimer particles from hydrogel and shellac. These particles significantly enhance emulsion stability, offering a superior alternative to traditional surfactants for diverse applications.

Keywords:

Janus particle Pickering emulsion amphiphilic particle colloidal surfactant hydrogel microfluidics

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Published on: October 10, 2016

Area of Science:

Materials Science
Colloid and Surface Chemistry
Biotechnology

Background:

Traditional emulsions stabilized by surfactants are prone to slow coalescence over time.
Pickering emulsions, stabilized by colloidal particles, offer enhanced stability.
Developing novel, biocompatible colloidal particles for emulsion stabilization is an ongoing area of research.

Purpose of the Study:

To fabricate biocompatible amphiphilic dimer particles with contrasting wetting properties for enhanced emulsion stabilization.
To investigate the formation and properties of hydrogel-solid dimer particles.
To demonstrate the efficacy of these particles as colloidal surfactants for both water-in-oil and oil-in-water emulsions.

Main Methods:

Fabrication of monodisperse single emulsions using a flow-focusing microfluidics device.
Generation of amphiphilic dimer particles by precipitating shellac from alginate solution in oil.
Cross-linking of the alginate hydrogel bulb with calcium cations for particle stabilization.

Main Results:

Successfully fabricated biocompatible amphiphilic dimer particles with distinct hydrophilic (alginate hydrogel) and hydrophobic (shellac) bulbs.
Demonstrated that these dimer particles adsorb at the water/oil interface, effectively stabilizing emulsions.
Achieved enhanced stability for both water-in-oil and oil-in-water emulsions using these novel colloidal surfactants.

Conclusions:

The developed amphiphilic hydrogel-solid particles act as efficient colloidal surfactants, significantly improving emulsion stability.
These biocompatible particles offer a promising alternative to conventional surfactants in various applications.
The unique structure and properties of dimer particles lead to robust and versatile emulsion stabilization.