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Issue 25, 2017
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Synchrotron X-ray tomographic quantification of microstructural evolution in ice cream – a multi-phase soft solid

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Abstract

Microstructural evolution in soft matter directly influences not only the material's mechanical and functional properties, but also our perception of that material's taste. Using synchrotron X-ray tomography and cryo-SEM we investigated the time–temperature evolution of ice cream's microstructure. This was enabled via three advances in synchrotron tomography: a bespoke tomography cold stage; improvements in pink beam in line phase contrast; and a novel image processing strategy for reconstructing and denoising in line phase contrast tomographic images. Using these three advances, we qualitatively and quantitatively investigated the effect of thermal changes on the ice cream's microstructure after 0, 7 and 14 thermal cycles between −15 and −5 °C. The results demonstrate the effect of thermal cycling on the coarsening of both the air cells and ice crystals in ice cream. The growth of ice crystals almost ceases after 7 thermal cycles when they approach the size of the walls between air cells, while air cells continue to coarsen, forming interconnected channels. We demonstrate that the tomographic volumes provide a statistically more representative sample than cryo-SEM, and elucidate the three dimensional morphology and connectivity of phases. This resulted in new insights including the role of air cells in limiting ice crystal coarsening.

Graphical abstract: Synchrotron X-ray tomographic quantification of microstructural evolution in ice cream – a multi-phase soft solid

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Publication details

The article was received on 15 Jan 2017, accepted on 27 Feb 2017 and first published on 09 Mar 2017


Article type: Paper
DOI: 10.1039/C7RA00642J
Citation: RSC Adv., 2017,7, 15561-15573
  • Open access: Creative Commons BY license
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    Synchrotron X-ray tomographic quantification of microstructural evolution in ice cream – a multi-phase soft solid

    E. Guo, G. Zeng, D. Kazantsev, P. Rockett, J. Bent, M. Kirkland, G. Van Dalen, D. S. Eastwood, D. StJohn and P. D. Lee, RSC Adv., 2017, 7, 15561
    DOI: 10.1039/C7RA00642J

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