Anomalous relaxation of coarsening foams with viscoelastic continuous phases

Autor(en)

Chiara Guidolin, Emmanuelle Rio, Roberto Cerbino, Anniina Salonen, Fabio Giavazzi

Abstrakt

We investigate the ultraslow structural relaxation of ageing foams with rheologically tunable continuous phases. We probe the bubble dynamics associated with pressure-driven foam coarsening using differential dynamic microscopy, which allows characterising the sample dynamics in reciprocal space with imaging experiments. Similar to other out-of-equilibrium jammed soft systems, these foams exhibit compressed exponential relaxations, with a ballistic-like linear dependency of the relaxation rate on the scattering wavevector. By tuning the rheology of the continuous phase, we observe changes in the relaxation shape, where stiffer matrices yield larger compression exponents. Our results corroborate recent real-space observations obtained using bubble tracking, providing a comprehensive overview of structural relaxation in these complex systems, both in direct and reciprocal space.

Organisation(en)

Computergestützte Physik und Physik der Weichen Materie

Externe Organisation(en)

Università degli Studi di Milano-Bicocca, Université Paris Saclay

Journal

Soft Matter

Band

20

Seiten

7021-7029

Anzahl der Seiten

9

ISSN

1744-683X

DOI

https://doi.org/10.1039/D4SM00588K

Publikationsdatum

2024

Peer-reviewed

Ja

ÖFOS 2012

103015 Kondensierte Materie, 103045 Lichtoptische Mikroskopie, 103018 Materialphysik

Schlagwörter

ASJC Scopus Sachgebiete

Condensed Matter Physics, Allgemeine Chemie

Link zum Portal

https://ucrisportal.univie.ac.at/de/publications/191c28b9-3f3c-4373-a9f5-decef42ae4bf