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Combining Microfluidics and Microrheology to Determine Rheological Properties of Soft Matter during Repeated Phase Transitions

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Published on: April 19, 2018

Microcapsule Buckling Triggered by Compression-Induced Interfacial Phase Change.

Andrew R Salmon¹, Richard M Parker¹, Alexander S Groombridge¹

¹Department of Chemistry, University of Cambridge , Lensfield Road, Cambridge CB2 1EW, United Kingdom.

Langmuir : the ACS Journal of Surfaces and Colloids

|October 5, 2016

Summary

This summary is machine-generated.

Researchers explored microcapsule fabrication at liquid interfaces. They found that polymer film compression causes buckling, a key step in microcapsule formation, by increasing density and thickness.

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Area of Science:

Materials Science
Soft Matter Physics
Supramolecular Chemistry

Background:

Microcapsule fabrication at liquid interfaces is a growing field.
Understanding interfacial processes is crucial for controlling microcapsule parameters.

Purpose of the Study:

To investigate the interfacial processes governing the formation of poly(vinyl alcohol) microcapsules.
To understand the role of compression-induced phase changes in interfacial film buckling.

Main Methods:

Assembling poly(vinyl alcohol) films at water-in-oil microfluidic droplet interfaces.
Cross-linking polymer films using cucurbit[8]uril ternary supramolecular complexes.
Inducing evaporative compression to study film density and thickness changes.

Main Results:

Compression-induced phase change triggers buckling in the interfacial film.
Interfacial film density and thickness increase upon evaporative compression.
A critical density is reached, leading to a phase change and buckling.
Film density increase is related to Poisson ratio and area compression.
A fixed thickness-to-radius ratio at buckling is explained.

Conclusions:

The study provides fundamental insights into compressive interfacial phase changes.
The findings can explain buckling phenomena in microcapsule formation.
This work advances the control and understanding of interfacial microcapsule fabrication.