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Wall fluidization in two acts: from stiff to soft roughness.
Soft Matter. 2018 Feb 14; 14(7):1088-1093.SM

Abstract

Fluidization of soft glassy materials (SGMs) in microfluidic channels is affected by the wall roughness in the form of microtexturing. When SGMs flow across microgrooves, their constituents are likely trapped within the grooves' gap, and the way they are released locally modifies the fluidization close to the walls. By leveraging a suitable combination of experiments and numerical simulations on concentrated emulsions (a model SGM), we quantitatively report the existence of two physically different scenarios. When the gap is large compared to the droplets in the emulsion, the droplets hit the solid obstacles and easily escape scrambling with their neighbors. Conversely, as the gap spacing is reduced, droplets get trapped inside, creating a "soft roughness" layer, i.e. a complementary series of deformable posts from which overlying droplets are in turn released. In both cases, the induced fluidization scales with the grooves' density, although with a reduced prefactor for narrow gaps, accounting for the softness of the roughness. Both scenarios are also well distinguished via the statistics of the droplets displacement field close to the walls, with large deviations induced by the surface roughness, depending on its stiffness.

Authors+Show Affiliations

Dipartimento di Fisica e Astronomia "G. Galilei"- DFA, Università di Padova, via Marzolo, 8 - 35131, Padova PD, Italy. ladislav.derzsi@unipd.it derzsi.ladislav@gmail.com matteo.pierno@unipd.it.No affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info availableNo affiliation info available

Pub Type(s)

Journal Article

Language

eng

PubMed ID

29318253

Citation

Derzsi, Ladislav, et al. "Wall Fluidization in Two Acts: From Stiff to Soft Roughness." Soft Matter, vol. 14, no. 7, 2018, pp. 1088-1093.
Derzsi L, Filippi D, Lulli M, et al. Wall fluidization in two acts: from stiff to soft roughness. Soft Matter. 2018;14(7):1088-1093.
Derzsi, L., Filippi, D., Lulli, M., Mistura, G., Bernaschi, M., Garstecki, P., Sbragaglia, M., & Pierno, M. (2018). Wall fluidization in two acts: from stiff to soft roughness. Soft Matter, 14(7), 1088-1093. https://doi.org/10.1039/c7sm02093g
Derzsi L, et al. Wall Fluidization in Two Acts: From Stiff to Soft Roughness. Soft Matter. 2018 Feb 14;14(7):1088-1093. PubMed PMID: 29318253.
* Article titles in AMA citation format should be in sentence-case
TY - JOUR T1 - Wall fluidization in two acts: from stiff to soft roughness. AU - Derzsi,Ladislav, AU - Filippi,Daniele, AU - Lulli,Matteo, AU - Mistura,Giampaolo, AU - Bernaschi,Massimo, AU - Garstecki,Piotr, AU - Sbragaglia,Mauro, AU - Pierno,Matteo, PY - 2018/1/11/pubmed PY - 2018/1/11/medline PY - 2018/1/11/entrez SP - 1088 EP - 1093 JF - Soft matter JO - Soft Matter VL - 14 IS - 7 N2 - Fluidization of soft glassy materials (SGMs) in microfluidic channels is affected by the wall roughness in the form of microtexturing. When SGMs flow across microgrooves, their constituents are likely trapped within the grooves' gap, and the way they are released locally modifies the fluidization close to the walls. By leveraging a suitable combination of experiments and numerical simulations on concentrated emulsions (a model SGM), we quantitatively report the existence of two physically different scenarios. When the gap is large compared to the droplets in the emulsion, the droplets hit the solid obstacles and easily escape scrambling with their neighbors. Conversely, as the gap spacing is reduced, droplets get trapped inside, creating a "soft roughness" layer, i.e. a complementary series of deformable posts from which overlying droplets are in turn released. In both cases, the induced fluidization scales with the grooves' density, although with a reduced prefactor for narrow gaps, accounting for the softness of the roughness. Both scenarios are also well distinguished via the statistics of the droplets displacement field close to the walls, with large deviations induced by the surface roughness, depending on its stiffness. SN - 1744-6848 UR - https://www.unboundmedicine.com/medline/citation/29318253/Wall_fluidization_in_two_acts:_from_stiff_to_soft_roughness L2 - https://doi.org/10.1039/c7sm02093g DB - PRIME DP - Unbound Medicine ER -
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