Study of aqueous foams evolution by means of X-ray radioscopy

[Display omitted] ► Time-resolved X-ray radiography has been applied to the study of aqueous foams. ► The technique present optimum spatial and temporal resolutions. ► Precise liquid fraction profiles can be obtained. ► Bubbles can be sharply visualized with no depth of field limitation. This paper...

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Bibliographic Details
Published in:Colloids and surfaces. A, Physicochemical and engineering aspects Physicochemical and engineering aspects, 2013-12, Vol.438, p.159-166
Main Authors: Solórzano, E., Pardo-Alonso, S., de Saja, J.A., Rodríguez-Pérez, M.A.
Format: Article
Language:English
Subjects:
Aqueous foams
beers
Bubbles
colloids
Containers
Density
Evolution
Foams
image analysis
Imaging
Liquid fraction
Liquids
Pixels
Visualization
X-radiation
X-ray
X-rays
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Summary:[Display omitted] ► Time-resolved X-ray radiography has been applied to the study of aqueous foams. ► The technique present optimum spatial and temporal resolutions. ► Precise liquid fraction profiles can be obtained. ► Bubbles can be sharply visualized with no depth of field limitation. This paper aims to show the applicability of time-resolved X-ray imaging (X-ray radioscopy) to the study of evolving density profiles and bubble structure in aqueous foam columns. Two different experimental configurations have been tested with different purposes. The macro-mode configuration allowed a precise determination of the liquid fraction profile in the foam column in a rather large cylindrical container (h=120mm Ø=68mm). The spatial resolution in the height direction was approximately 50μm with a total number of 2230pixels lines. Time resolution for this configuration was in the range of 2s. Alternatively, the micro-mode configuration (7μm pixel size) permitted a sharp visualization of the individual bubbles contained in a thin -3mm- rectangular prism container with higher time resolutions 600ms. Information about the liquid fraction profile and its evolution has been also calculated under this configuration. Foam columns produced from different beer styles have been used as testing specimens. Liquid fraction profiles permitted to analyse precisely the foam stability and the foam–liquid interface with a combined accuracy and spatial resolution not obtained before. Bubble degeneration events have also been sharply visualized with X-rays by using time resolutions in the limit of the technique.
ISSN:0927-7757
1873-4359
DOI:10.1016/j.colsurfa.2013.01.052