Kühnhammer, Matthias ; Braun, Larissa ; Ludwig, Michael ; Soltwedel, Olaf ; Chiappisi, Leonardo ; Klitzing, Regine von (2022)
A new model to describe small-angle neutron scattering from foams.
In: Journal of Applied Crystallography, 55 (4)
doi: 10.1107/S1600576722004691
Artikel, Bibliographie
Kurzbeschreibung (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.
| Typ des Eintrags: | Artikel |
|---|---|
| Erschienen: | 2022 |
| Autor(en): | Kühnhammer, Matthias ; Braun, Larissa ; Ludwig, Michael ; Soltwedel, Olaf ; Chiappisi, Leonardo ; Klitzing, Regine von |
| Art des Eintrags: | Bibliographie |
| Titel: | A new model to describe small-angle neutron scattering from foams |
| Sprache: | Englisch |
| Publikationsjahr: | 2022 |
| Verlag: | International Union of Crystallography |
| Titel der Zeitschrift, Zeitung oder Schriftenreihe: | Journal of Applied Crystallography |
| Jahrgang/Volume einer Zeitschrift: | 55 |
| (Heft-)Nummer: | 4 |
| DOI: | 10.1107/S1600576722004691 |
| Kurzbeschreibung (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. |
| Fachbereich(e)/-gebiet(e): | 05 Fachbereich Physik 05 Fachbereich Physik > Institut für Festkörperphysik (2021 umbenannt in Institut für Physik Kondensierter Materie (IPKM)) |
| Hinterlegungsdatum: | 18 Jul 2022 08:45 |
| Letzte Änderung: | 07 Dez 2022 14:03 |
| PPN: | 502350776 |
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