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Updated: Oct 29, 2025

Coupling Carbon Capture from a Power Plant with Semi-automated Open Raceway Ponds for Microalgae Cultivation

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Light-switchable deposits from evaporating drops containing motile microalgae.

Marius R Bittermann¹, Daniel Bonn¹, Sander Woutersen²

¹Van der Waals-Zeeman Institute, Institute of Physics, University of Amsterdam, Science Park 904, 1098 XH, Amsterdam, The Netherlands. m.r.bittermann@uva.nl a.deblais@uva.nl.

|July 14, 2021

Summary

This summary is machine-generated.

Researchers controlled microalgae patterns in drying droplets. By adjusting light, they manipulated the formation and structure of algal deposits, overcoming the typical coffee ring effect.

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Area of Science:

Biophysics
Microbiology
Materials Science

Background:

Evaporating droplets form various deposit patterns based on solute and solvent properties.
Colloidal suspensions typically exhibit the coffee ring effect due to outward fluid flow during evaporation.

Purpose of the Study:

To investigate deposit patterns formed by evaporating drops of living motile microalgae (Chlamydomonas reinhardtii).
To explore the use of microalgae's light-sensitivity to control deposit morphology, specifically the coffee ring effect.

Main Methods:

Studied evaporating drops containing Chlamydomonas reinhardtii.
Manipulated light wavelength and incident angle to influence algal behavior and deposit formation.
Observed and analyzed the resulting spatial structures of the algal deposits.

Main Results:

Chlamydomonas reinhardtii can resist the radially outward flows that cause the coffee ring effect.
Light-sensitivity of the microalgae allows for precise control over deposit patterns.
Adjusting light conditions can force the formation, suppress, or direct the spatial structure of algal coffee rings.

Conclusions:

The light-sensitivity of motile microalgae offers a novel method for controlling self-assembly patterns in evaporating droplets.
This approach provides a way to engineer complex, directed structures from biological micro-particles, moving beyond the limitations of the coffee ring effect.