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Monitoring Spatial Segregation in Surface Colonizing Microbial Populations

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Published on: October 29, 2016

Substrate colonization by an emulsion drop prior to spreading.

Suraj Borkar¹, Arun Ramachandran²

¹Department of Chemical Engineering and Applied Chemistry, University of Toronto, Toronto, ON, M5S 3E5, Canada.

Nature Communications

|October 1, 2021

Summary

A new emulsion wetting mechanism reveals drops dissolve and reform as surface islands. This process, driven by surface interactions, challenges classical wetting theories and impacts multiphase flow applications.

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Area of Science:

Fluid dynamics
Surface science
Colloid science

Background:

Classical wetting models assume limited solubility, overlooking drop phase dissolution.
The established mechanism involves bridge formation preceding emulsion drop spreading.

Purpose of the Study:

To investigate a novel wetting mechanism for emulsion drops.
To explore the role of finite solubility in the wetting process.

Main Methods:

Experimental observation of emulsion drop behavior on surfaces.
Analysis of island nucleation and growth dynamics.
Investigation of solubility changes near the contact line.

Main Results:

Emulsion drops dissolve in the suspending medium and nucleate as surface islands.
Island growth is driven by reduced solubility near the contact line due to attractive surface interactions.
Wetting occurs via coalescence of the parent drop with surface islands, influencing film heights and drainage times.

Conclusions:

A new dissolution-nucleation-growth wetting mechanism for emulsions is experimentally demonstrated.
This mechanism challenges the classical bridge-formation model by incorporating finite solubility.
Findings have implications for froth flotation, liquid-infused surfaces, and microfluidics.