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A new model to describe small-angle neutron scattering from foams

Kühnhammer, Matthias ; Braun, Larissa ; Ludwig, Michael ; Soltwedel, Olaf ; Chiappisi, Leonardo ; Klitzing, Regine von (2024)
A new model to describe small-angle neutron scattering from foams.
In: Journal of Applied Crystallography, 2022, 55 (4)
doi: 10.26083/tuprints-00026635
Article, Secondary publication, Publisher's Version

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Item Type: Article
Type of entry: Secondary publication
Title: A new model to describe small-angle neutron scattering from foams
Language: English
Date: 10 September 2024
Place of Publication: Darmstadt
Year of primary publication: 2022
Place of primary publication: Copenhagen
Publisher: International Union of Crystallography
Journal or Publication Title: Journal of Applied Crystallography
Volume of the journal: 55
Issue Number: 4
Collation: 11 Seiten
DOI: 10.26083/tuprints-00026635
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Origin: Secondary publication service
Abstract:

The modelling of scattering data from foams is very challenging due to the complex structure of foams and is therefore often reduced to the fitting of single peak positions or feature mimicking. This article presents a more elaborate model to describe the small-angle neutron scattering (SANS) data from foams. The model takes into account the geometry of the foam bubbles and is based on an incoherent superposition of the reflectivity curves arising from the foam films and the small-angle scattering (SAS) contribution from the plateau borders. The model is capable of describing the complete scattering curve of a foam stabilized by the standard cationic surfactant tetradecyltrimethylammonium bromide (C14TAB) with different water contents, i.e. different drainage states, and provides information on the thickness distribution of liquid films inside the foam. The mean film thickness decreases with decreasing water content because of drainage, from 28 to 22 nm, while the polydispersity increases. These results are in good agreement with the film thicknesses of individual horizontal foam films studied with a thin-film pressure balance.

Uncontrolled Keywords: foams, foam films, small-angle neutron scattering, neutron reflectometry, thin-film pressure balances
Status: Publisher's Version
URN: urn:nbn:de:tuda-tuprints-266350
Classification DDC: 500 Science and mathematics > 530 Physics
500 Science and mathematics > 540 Chemistry
Divisions: 05 Department of Physics > Institute for Condensed Matter Physics
Date Deposited: 10 Sep 2024 07:29
Last Modified: 10 Sep 2024 07:30
URI: https://tuprints.ulb.tu-darmstadt.de/id/eprint/26635
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