Bubbles with sides
Amazing shapes and yet minimal…
Fight between bubbles!
The Olympic Games of droplets
Six devices for experimenting and playing with six physical properties
The Art of Suminagashi
Minimal surfaces for soap
Illustrations for a better understanding !
Download illustrations :
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ENGLISH Version (pdf)
FRENCH Version (pdf)
All images in jpg (french and english)
At the soft matter department of the Physics Institute of Rennes, we are interested in the organization and dynamics of molecules that adsorb to the surface of liquids. They can be surfactants, polymers, proteins or solid particles. In terms of dynamics, we seek on the one hand to highlight and control the Marangoni flows - obtained in response to concentration gradients at the surface - and on the other hand to understand the role they can play in macroscopic phenomena (rheology and stability of foams, formation of bubbles, sliding on walls, etc.). Recently, we have studied how it is possible to create by the Marangoni effect a two-dimensional liquid jet on the surface of the water, and how it then tends to destabilize in the form of meanders. We have also learned to trigger Marangoni flows at will by temperature or light using thermo- and photosensitive molecules.
This project was developed with three research teamswho work on the Marangoni Effect together. Discover their work.
At the Solid State Laboratory at Orsay, we have been working on the visualisationof the surfactants in the Marangoni flow. We have synthesized our own surfacant, which fluorescesunder ultraviolet-light. This means that as we shine UV light on the surfactant it emits a blue or agreen light depending on its concentration. Therefore, we can see where the surfactants are duringtheir flow. We have used their fluorescence to follow the flow of the surfactants on the surface,where we can see the Marangoni zone and the accumulation of surfactant at the edges of the zone.We can also follow the flow patterns in the fluid below as the surfactants dive off the surface. Wehope to learn more about surfactant surface properties, and the flows they create.
Discover three research labs who work on Marangoni Effect
At MSC at Paris, experiments around Marangoni flows focus on the link between the properties of the flow that we see at the surface of the water layer and the molecular features of surface-active molecules (so called surfactants, or in more simple terms... soaps :)). We look for manifestation of the molecules in all aspects of the flow, be it its size or the number of whirls. We also study how good a surfactant can be at propelling an object at the surface of water, so-called Marangoni boats.
Website of Marie Jamon
This popularization project was designed thanks to a collaboration between designers and physicists:
Design : Marianne Cardon (design and video) and Marie Jamon (illustration and graphism)
Physics : Matthieu Roché et Gabriel Le Doudic (MSC), Anniina Salonen et Julien Bobroff (LPS)
The project was developed with the support of the ANR “Carangoni”, and involved the MMOI and the “Physics Reimagined” teams from the Laboratoire de Physique des Solides (Université Paris-Saclay and CNRS) and Matthieu Roché's team from the Laboratoire de Systèmes Complexes (University of Paris and CNRS).