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Microfluidic Devices for Characterizing Pore-scale Event Processes in Porous Media for Oil Recovery Applications

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Nano- and microstructure of air/oil/water interfaces.

Duncan J McGillivray¹, Jitendra P Mata, John W White

¹Research School of Chemistry, Australian National University, Canberra, ACT 0200, Australia.

Langmuir : the ACS Journal of Surfaces and Colloids

|August 29, 2009

Summary

Researchers created stable, thin oil films on water using polyisobutylene-based (PIB) surfactants. These films reveal complex microstructures at the oil/water interface, crucial for understanding emulsions.

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Area of Science:

Colloid and Surface Science
Materials Science
Physical Chemistry

Background:

Understanding the oil/water interface is critical for applications like emulsions.
Previous studies lacked methods to create and analyze stable, variable-thickness oil films.

Purpose of the Study:

To develop a model system for studying surfactant competition at the oil/water interface.
To characterize the structure and behavior of thin oil films formed by polyisobutylene-based (PIB) surfactants and alkanes.

Main Methods:

Creation of air/oil/water interfaces with variable-thickness oil films using PIB surfactants and alkanes.
X-ray reflectometry to measure oil film thickness (up to ~100 Å).
Brewster angle microscopy (BAM) to visualize interfacial structures.

Main Results:

Stable oil layers with bulk oil densities were formed.
X-ray reflectometry confirmed oil film thicknesses up to approximately 100 Å.
BAM revealed microscale inhomogeneities (1-10 µm) and a spongy, microtextured structure beyond a phase transition at ~24 mN m⁻¹.

Conclusions:

The developed system allows for studying surfactant competition at the oil/water interface.
The observed microstructures provide insights into the complexity of oil/water interfaces in emulsions.
The findings challenge simple models of thin film behavior, highlighting the importance of interfacial morphology.