Quantifying cooperative flow of fat crystal dispersions
We quantify the cooperative flow behaviour of fat crystal dispersions (FCDs) upon varying crystallization conditions. The latter enabled altering the multiscale microstructure of the FCDs, from the nanometer-sized platelets, and the dispersed fractal aggregates, up to the strength of the mesoscopic weak-link network. To the goal of characterizing strongly-confined flow in these optically-opaque materials, we acquire high-resolution rheo-magnetic-resonance-imaging (rheo-MRI) velocimetry measurements using an in-house developed 500 μm gap Couette cell (CC). We introduce a numerical fitting method based on the fluidity model, which yields the cooperativity length, ξ, in the narrow-gap CC. FCDs with aggregates sizes smaller than the confinement size by an order of magnitude were found to exhibit cooperativity effects. The respective ξ values diverged at the yield stress, in agreement with the Kinetic Elasto-Plastic (KEP) theory. In contrast, the FCD with aggregates sizes in the order of the gap size did not exhibit any cooperativity effect: we attribute this result to the correspondingly decreased mobility of the aggregates. We foresee that our optimized rheo-MRI measurement and fitting analysis approach will propel further similar studies of flow of other multi-scale and optically-opaque materials.
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dig-wur-nl-wurpubs-5968712024-10-02 Milc, Klaudia W. Dijksman, Joshua A. van Duynhoven, John P.M. Terenzi, Camilla Article/Letter to editor Soft Matter 18 (2022) 14 ISSN: 1744-683X Quantifying cooperative flow of fat crystal dispersions 2022 We quantify the cooperative flow behaviour of fat crystal dispersions (FCDs) upon varying crystallization conditions. The latter enabled altering the multiscale microstructure of the FCDs, from the nanometer-sized platelets, and the dispersed fractal aggregates, up to the strength of the mesoscopic weak-link network. To the goal of characterizing strongly-confined flow in these optically-opaque materials, we acquire high-resolution rheo-magnetic-resonance-imaging (rheo-MRI) velocimetry measurements using an in-house developed 500 μm gap Couette cell (CC). We introduce a numerical fitting method based on the fluidity model, which yields the cooperativity length, ξ, in the narrow-gap CC. FCDs with aggregates sizes smaller than the confinement size by an order of magnitude were found to exhibit cooperativity effects. The respective ξ values diverged at the yield stress, in agreement with the Kinetic Elasto-Plastic (KEP) theory. In contrast, the FCD with aggregates sizes in the order of the gap size did not exhibit any cooperativity effect: we attribute this result to the correspondingly decreased mobility of the aggregates. We foresee that our optimized rheo-MRI measurement and fitting analysis approach will propel further similar studies of flow of other multi-scale and optically-opaque materials. en application/pdf https://research.wur.nl/en/publications/quantifying-cooperative-flow-of-fat-crystal-dispersions 10.1039/d2sm00233g https://edepot.wur.nl/569138 Life Science https://creativecommons.org/licenses/by-nc/4.0/ https://creativecommons.org/licenses/by-nc/4.0/ Wageningen University & Research |
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Life Science Life Science Milc, Klaudia W. Dijksman, Joshua A. van Duynhoven, John P.M. Terenzi, Camilla Quantifying cooperative flow of fat crystal dispersions |
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We quantify the cooperative flow behaviour of fat crystal dispersions (FCDs) upon varying crystallization conditions. The latter enabled altering the multiscale microstructure of the FCDs, from the nanometer-sized platelets, and the dispersed fractal aggregates, up to the strength of the mesoscopic weak-link network. To the goal of characterizing strongly-confined flow in these optically-opaque materials, we acquire high-resolution rheo-magnetic-resonance-imaging (rheo-MRI) velocimetry measurements using an in-house developed 500 μm gap Couette cell (CC). We introduce a numerical fitting method based on the fluidity model, which yields the cooperativity length, ξ, in the narrow-gap CC. FCDs with aggregates sizes smaller than the confinement size by an order of magnitude were found to exhibit cooperativity effects. The respective ξ values diverged at the yield stress, in agreement with the Kinetic Elasto-Plastic (KEP) theory. In contrast, the FCD with aggregates sizes in the order of the gap size did not exhibit any cooperativity effect: we attribute this result to the correspondingly decreased mobility of the aggregates. We foresee that our optimized rheo-MRI measurement and fitting analysis approach will propel further similar studies of flow of other multi-scale and optically-opaque materials. |
format |
Article/Letter to editor |
topic_facet |
Life Science |
author |
Milc, Klaudia W. Dijksman, Joshua A. van Duynhoven, John P.M. Terenzi, Camilla |
author_facet |
Milc, Klaudia W. Dijksman, Joshua A. van Duynhoven, John P.M. Terenzi, Camilla |
author_sort |
Milc, Klaudia W. |
title |
Quantifying cooperative flow of fat crystal dispersions |
title_short |
Quantifying cooperative flow of fat crystal dispersions |
title_full |
Quantifying cooperative flow of fat crystal dispersions |
title_fullStr |
Quantifying cooperative flow of fat crystal dispersions |
title_full_unstemmed |
Quantifying cooperative flow of fat crystal dispersions |
title_sort |
quantifying cooperative flow of fat crystal dispersions |
url |
https://research.wur.nl/en/publications/quantifying-cooperative-flow-of-fat-crystal-dispersions |
work_keys_str_mv |
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