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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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Double Emulsion Generation Using a Polydimethylsiloxane PDMS Co-axial Flow Focus Device

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Phase Inversion of Ellipsoid-Stabilized Emulsions.

Hemant Kumar¹, Venkateshwar Rao Dugyala², Madivala G Basavaraj¹

¹Polymer Engineering and Colloid Science(PECS) Laboratory, Department of Chemical Engineering, Indian Institute of Technology Madras, Chennai - 600036, Tamil Nadu, India.

Langmuir : the ACS Journal of Surfaces and Colloids

|June 8, 2021

Summary

Adding oleic acid to hematite ellipsoids modifies their surface, causing Pickering emulsion phase inversion and forming nonspherical emulsion drops. This wettability change drives the transition from oil-in-water to water-in-oil emulsions.

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Phase Behavior of Charged Vesicles Under Symmetric and Asymmetric Solution Conditions Monitored with Fluorescence Microscopy

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Published on: October 24, 2017

Area of Science:

Colloid and Surface Science
Materials Science
Chemical Engineering

Background:

Anisotropic particles stabilize Pickering emulsions via shape-induced capillary interactions.
Controlling emulsion phase behavior is crucial for various industrial applications.

Purpose of the Study:

To investigate the effect of in situ surface modification of hematite ellipsoids with oleic acid on Pickering emulsion stabilization.
To explore the resulting changes in emulsion phase and droplet morphology.

Main Methods:

Utilized hematite nanoellipsoids and microellipsoids.
Employed in situ surface modification with oleic acid.
Analyzed emulsion phase inversion and droplet shape using contact angle goniometry.

Main Results:

Oleic acid addition induced transitional phase inversion from oil-in-water to water-in-oil emulsions.
Nonspherical emulsion drops were formed, transitioning from spherical shapes.
Particle arrangement at the interface changed from close-packed to loosely packed with varying oleic acid concentrations.

Conclusions:

Surface modification of anisotropic particles with oleic acid is an effective method to control Pickering emulsion phase inversion.
Changes in particle wettability and interfacial arrangement dictate emulsion stability and morphology.
The study demonstrates a novel approach to tune emulsion properties using surface-active agents and anisotropic particles.