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Related Experiment Video

Updated: Feb 24, 2026

Microfluidic Fabrication Techniques for High-Pressure Testing of Microscale Supercritical CO2 Foam Transport in Fractured Unconventional Reservoirs

Microfluidic Fabrication Techniques for High-Pressure Testing of Microscale Supercritical CO2 Foam Transport in Fractured Unconventional Reservoirs

Published on: July 2, 2020

Pressure-Responsive, Surfactant-Free CO₂-Based Nanostructured Fluids.

Natascia Grimaldi, Paula Elena Rojas¹, Simon Stehle^2,3

¹Centro de Investigacion Biomedica en Red de Bioingenieria, Biomateriales y Nanomedicina (CIBER-BBN) , 28029 Madrid, Spain.

|August 29, 2017

Summary

Researchers developed novel surfactant-free, carbon dioxide (CO2)-based microemulsions. These systems exhibit pressure-responsive nanostructuration for tunable mixing and demixing, offering sustainable chemical processing solutions.

Keywords:

MD simulations Raman SANS compressed CO2 microemulsion nanostructured fluids neutron scattering surfactant-free

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Published on: March 23, 2021

Area of Science:

Physical Chemistry
Materials Science
Chemical Engineering

Background:

Traditional microemulsions require significant surfactant amounts, posing economic and environmental challenges.
Surfactants in microemulsions can act as contaminants in advanced material and chemical processing.
Developing surfactant-free alternatives is crucial for sustainable industrial applications.

Purpose of the Study:

To investigate the nanostructuration of novel surfactant-free, carbon dioxide (CO2)-based microemulsion-like systems.
To characterize the pressure-responsive behavior of these CO2-based fluids.
To explore their potential applications in molecular material processing and chemical engineering.

Main Methods:

Raman spectroscopy
Molecular dynamics simulations
Small-angle neutron scattering

Main Results:

Observation and characterization of "water-rich" nanodomains within a "water-depleted" matrix.
Demonstration of reversible, pressure-triggered nanostructuration and spontaneous formation.
Confirmation of rapid, homogeneous mixing/demixing upon pressure changes.

Conclusions:

Surfactant-free CO2-based microemulsion-like systems exhibit unique pressure-responsive nanostructuration.
These fluids offer spontaneous formation, tunable solvation, and contaminant-free processing.
Their properties make them highly appealing for advanced molecular material processing and chemical engineering.