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Laboratory layered latte

Author(s): Xue, N; Khodaparast, S; Zhu, L; Nunes, JK; Kim, H; et al

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Abstract: Inducing thermal gradients in fluid systems with initial, well-defined density gradients results in the formation of distinct layered patterns, such as those observed in the ocean due to double-diffusive convection. In contrast, layered composite fluids are sometimes observed in confined systems of rather chaotic initial states, for example, lattes formed by pouring espresso into a glass of warm milk. Here, we report controlled experiments injecting a fluid into a miscible phase and show that, above a critical injection velocity, layering emerges over a time scale of minutes. We identify critical conditions to produce the layering, and relate the results quantitatively to double-diffusive convection. Based on this understanding, we show how to employ this single-step process to produce layered structures in soft materials, where the local elastic properties vary step-wise along the length of the material.
Publication Date: 2017
Citation: Xue, N, Khodaparast, S, Zhu, L, Nunes, JK, Kim, H, Stone, HA. (2017). Laboratory layered latte. Nature Communications, 8 (10.1038/s41467-017-01852-2
DOI: doi:10.1038/s41467-017-01852-2
Type of Material: Journal Article
Journal/Proceeding Title: Nature Communications
Version: Final published version. This is an open access article.

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