What the study found
The review finds that European Space Agency (ESA) microgravity experiments have helped reveal behaviors in soft matter that gravity can hide on Earth. These studies covered complex fluids, foams, emulsions, granular materials, colloidal glasses, soft particles, and red blood cells.
Why the authors say this matters
The authors conclude that ESA’s microgravity platforms are relevant for expanding soft matter rheology, which is the study of how matter flows and deforms. They suggest these platforms complement Earth-based experiments by reducing gravity-related effects such as sedimentation and drainage.
What the researchers tested
This is a short review of past and present ESA-led projects of interest to rheologists. The paper summarizes interfacial rheology experiments using capillary pressure tensiometers, studies of foam coarsening and emulsion droplet dynamics, granular material investigations, experiments on thermally driven perturbation of soft colloidal glasses, and work on aggregation and migration of soft particles and red blood cells under flow.
What worked and what didn't
The abstract says the microgravity conditions enabled high-precision measurements of interfacial viscoelasticity and revealed plastic rearrangements in colloidal glasses. It also reports roaming bubbles in foams, progressive arrest of droplet motion in emulsions, margination effects in blood cell analogues under flow, and an improved understanding of how gravity affects convection and fluidization in agitated granular matter.
What to keep in mind
This summary is based only on the abstract of a review article, so it does not provide detailed methods, quantitative results, or full study-by-study limitations. The abstract also does not describe any negative findings or experimental failures.
Key points
- ESA microgravity experiments helped reveal soft matter behaviors that gravity can mask on Earth.
- The review covers foams, emulsions, granular materials, colloidal glasses, soft particles, and red blood cells.
- Microgravity enabled high-precision measurements of interfacial viscoelasticity.
- The abstract reports plastic rearrangements in colloidal glasses and roaming bubbles in foams.
- The authors conclude that ESA platforms complement Earth-based rheology experiments.
Disclosure
- Research title:
- Microgravity ESA experiments reveal soft matter rheology behaviors
- Authors:
- A. Martinelli, Luigi Cristofolini, Davide Orsi, Francesca Ravera, Libero Liggieri, Anniina Salonen, Thomas Podgorski, Christophe Minetti, Matthias Sperl, Luca Cipelletti, Naomi Murdoch, Marco Braibanti, S. Vincent-Bonnieu, Brice Saint-Michel
- Institutions:
- Centre National de la Recherche Scientifique, Centre National de la Recherche Scientifique, Deutsches Zentrum für Luft- und Raumfahrt e. V. (DLR), ESPCI Paris, European Space Agency, European Space Research and Technology Centre, European Space Research and Technology Centre, European Space Research and Technology Centre, Géosciences Montpellier, Géosciences Montpellier, Institut polytechnique de Grenoble, Institut Supérieur de l'Aéronautique et de l'Espace (ISAE-SUPAERO), Institut Universitaire de France, Institute of Condensed Matter Chemistry and Technologies for Energy, Institute of Condensed Matter Chemistry and Technologies for Energy, Laboratoire Charles Coulomb, Laboratoire Charles Coulomb, Laboratoire Rhéologie et Procédés, Sciences et Ingénierie de la Matière Molle, Sorbonne Université, Université de Montpellier, Université de Montpellier, Université Fédérale de Toulouse Midi-Pyrénées, Université Grenoble Alpes, Université Libre de Bruxelles, Université Paris Sciences et Lettres, University of Cologne, University of Parma, University of Parma
- Publication date:
- 2026-04-21
- DOI:
- 10.1122/8.0001074
- OpenAlex record:
- View
Get the weekly research newsletter
Stay current with scholarly research without reading academic papers — one filtered digest, every Friday.