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Related Experiment Video

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Interlinked Macroporous 3D Scaffolds from Microgel Rods

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Engineering Interconnected Open-Porous Particles via Microfluidics Using Bijel Droplets as Structural Templates.

Mina Masaoka¹, Hiroaki Ishida¹, Takaichi Watanabe¹

¹Department of Applied Chemistry, Graduate School of Natural Science and Technology, Okayama University, 3-1-1, Tsushima-naka, Kita-ku, Okayama 700-8530, Japan.

Langmuir : the ACS Journal of Surfaces and Colloids

|April 5, 2024

Summary

Researchers developed a microfluidic method to create open-porous particles using emulsion gels. This technique controls pore structure for applications in separation and catalysis.

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Area of Science:

Materials Science
Soft Matter Physics
Microfluidics

Background:

Designing porous materials is crucial for separation, catalysis, and cell culture.
Bicontinuous interfacially jammed emulsion gels are a unique class of soft matter.
These gels are formed by kinetically arresting spinodal decomposition, stabilized by neutral wetting colloidal particles.

Purpose of the Study:

To introduce a microfluidic technique for creating highly interconnected open-porous particles.
To investigate the formation of bijel (bicontinuous interfacially jammed emulsion gel) droplets.
To explore the influence of various parameters on the structure of the resulting microparticles.

Main Methods:

Utilized a microfluidic device to form monodisperse droplets containing a hydrophobic monomer, water, ethanol, and CTAB-modified silica particles.
Triggered spinodal decomposition via ethanol diffusion into a continuous cyclohexane phase.
Stabilized the phase-separated structure with CTAB-modified silica particles and induced photopolymerization.

Main Results:

Successfully created microparticles with highly interconnected, open pores.
Demonstrated that the oil-in-water to water-in-oil transition occurs with increasing CTAB/silica ratio, forming bicontinuous structures at intermediate ratios.
Observed pore size increase over time, arrested by CTAB-modified silica particles, and noted particle shape deformation due to channel orientation.

Conclusions:

The microfluidic technique offers precise control over porous particle architecture.
CTAB-modified silica particles are effective in stabilizing bijel structures and arresting coarsening.
Optimizing microchannel design (vertical setup) prevents droplet deformation, yielding spherical open-porous particles.