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Colloidal precipitates

Colloidal precipitates

The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...

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Dynamic Covalent Nanoparticles for Acid-Responsive Nonaqueous Pickering Emulsions.

Gaihuan Ren^1,2, Bo Li¹, Lulu Ren²

¹Textile and Garment Industry of Research Institute, Zhongyuan University of Technology, Zhengzhou, Henan 450007, P. R. China.

Langmuir : the ACS Journal of Surfaces and Colloids

|May 27, 2021

Summary

Acid-responsive Pickering emulsions were created using dynamic covalent silica nanoparticles. These emulsions, stable in neutral conditions, readily separate in acidic environments due to nanoparticle decomposition.

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Published on: January 7, 2019

Area of Science:

Colloid and Surface Science
Materials Chemistry
Nanotechnology

Background:

Pickering emulsions offer an alternative to conventional emulsions, utilizing solid particles for stabilization.
Nonaqueous Pickering emulsions are crucial for applications involving water-sensitive materials.
Developing responsive Pickering emulsions with tunable properties remains an active research area.

Purpose of the Study:

To synthesize and characterize acid-responsive, oil-wetted Pickering emulsifiers.
To prepare and investigate the stability of nonaqueous Pickering emulsions using these emulsifiers.
To demonstrate the controlled phase separation of these emulsions in response to acidic conditions.

Main Methods:

Synthesis of acid-responsive silica nanoparticles (SiO2-pDB) via Schiff base reaction.
Characterization of nanoparticle formation using FTIR, TGA, and elemental analysis.
Preparation and stability testing of nonaqueous Pickering emulsions in glycerol/n-decane systems.
Evaluation of emulsion response to acidic pH changes.

Main Results:

Successfully synthesized preferentially oil-wetted SiO2-pDB nanoparticles.
Prepared stable nonaqueous Pickering emulsions using SiO2-pDB.
Observed complete phase separation of emulsions upon exposure to acidic conditions.
Confirmed decomposition of SiO2-pDB into hydrophilic SiO2-NH2 and hydrophobic pDBA in acid.

Conclusions:

Acid-triggered decomposition of dynamic covalent nanoparticles enables controlled emulsion destabilization.
These acid-responsive Pickering emulsions are suitable for water-sensitive applications.
Potential applications include oil-based drilling fluids and other systems requiring tunable emulsion stability.