Comptes Rendus
Aqueous foams in microgravity, measuring bubble sizes
Comptes Rendus. Mécanique, Online first (2023), pp. 1-23.

The paper describes a study of wet foams in microgravity whose bubble size distribution evolves due to diffusive gas exchange. We focus on the comparison between the size of bubbles determined from images of the foam surface and the size of bubbles in the bulk foam, determined from Diffuse Transmission Spectroscopy (DTS). Extracting the bubble size distribution from images of a foam surface is difficult so we have used three different procedures: manual analysis, automatic analysis with a customized Python script and machine learning analysis. Once various pitfalls were identified and taken into account, all the three procedures yield identical results within error bars. DTS only allows the determination of an average bubble radius which is proportional to the photon transport mean free path * . The relation between the measured diffuse transmitted light intensity and * previously derived for slab-shaped samples of infinite lateral extent does not apply to the cuboid geometry of the cells used in the microgravity experiment. A new more general expression of the diffuse intensity transmitted with specific optical boundary conditions has been derived and applied to determine the average bubble radius. The temporal evolution of the average bubble radii deduced from DTS and of the same average radii of the bubbles measured at the sample surface is the same (to a factor probably close to one) throughout the coarsening. Finally, ground experiments were performed to compare bubble size distributions in a bulk wet foam and at its surface at times so short that diffusive gas exchange is insignificant. They were found to be similar, confirming that bubbles seen at the surface are representative of the bulk foam bubbles.

Online First:
DOI: 10.5802/crmeca.153
Keywords: Aqueous foams, Microgravity, Diffuse Transmission Spectroscopy, Image analysis, Bubble size distribution
Marina Pasquet 1; Nicolo Galvani 2, 3; Olivier Pitois 3; Sylvie Cohen-Addad 2, 4; Reinhard Höhler 2, 4; Anthony T. Chieco 5; Sam Dillavou 5; Jesse M. Hanlan 5; Douglas J. Durian 5; Emmanuelle Rio 6; Anniina Salonen 6; Dominique Langevin 6

1 Department of Chemistry, University of California, Berkeley, CA, USA
2 Sorbonne Université, Institut des NanoSciences de Paris, Paris, France
3 Université Gustave Eiffel, Laboratoire Navier, Marne-la-Vallée, France
4 Université Gustave Eiffel, Marne-la-Vallée, France
5 Department of Physics and Astronomy, University of Pennsylvania, Philadelphia, Pennsylvania 19104, USA
6 Université Paris-Saclay, CNRS, Laboratoire de Physique des Solides, Orsay, France
License: CC-BY 4.0
Copyrights: The authors retain unrestricted copyrights and publishing rights
     author = {Marina Pasquet and Nicolo Galvani and Olivier Pitois and Sylvie Cohen-Addad and Reinhard H\"ohler and Anthony T. Chieco and Sam Dillavou and Jesse M. Hanlan and Douglas J. Durian and Emmanuelle Rio and Anniina Salonen and Dominique Langevin},
     title = {Aqueous foams in microgravity, measuring bubble sizes},
     journal = {Comptes Rendus. M\'ecanique},
     publisher = {Acad\'emie des sciences, Paris},
     year = {2023},
     doi = {10.5802/crmeca.153},
     language = {en},
     note = {Online first},
AU  - Marina Pasquet
AU  - Nicolo Galvani
AU  - Olivier Pitois
AU  - Sylvie Cohen-Addad
AU  - Reinhard Höhler
AU  - Anthony T. Chieco
AU  - Sam Dillavou
AU  - Jesse M. Hanlan
AU  - Douglas J. Durian
AU  - Emmanuelle Rio
AU  - Anniina Salonen
AU  - Dominique Langevin
TI  - Aqueous foams in microgravity, measuring bubble sizes
JO  - Comptes Rendus. Mécanique
PY  - 2023
PB  - Académie des sciences, Paris
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DO  - 10.5802/crmeca.153
LA  - en
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%A Nicolo Galvani
%A Olivier Pitois
%A Sylvie Cohen-Addad
%A Reinhard Höhler
%A Anthony T. Chieco
%A Sam Dillavou
%A Jesse M. Hanlan
%A Douglas J. Durian
%A Emmanuelle Rio
%A Anniina Salonen
%A Dominique Langevin
%T Aqueous foams in microgravity, measuring bubble sizes
%J Comptes Rendus. Mécanique
%D 2023
%I Académie des sciences, Paris
%Z Online first
%R 10.5802/crmeca.153
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%F CRMECA_2023__351_S2_A16_0
Marina Pasquet; Nicolo Galvani; Olivier Pitois; Sylvie Cohen-Addad; Reinhard Höhler; Anthony T. Chieco; Sam Dillavou; Jesse M. Hanlan; Douglas J. Durian; Emmanuelle Rio; Anniina Salonen; Dominique Langevin. Aqueous foams in microgravity, measuring bubble sizes. Comptes Rendus. Mécanique, Online first (2023), pp. 1-23. doi : 10.5802/crmeca.153.

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