Shear localisation in interfacial particle layers and its influence on Lissajous-plots

Birbaum, Fabian C.; Haavisto, Sanna; Koponen, Antti; Windhab, Erich J.; Fischer, Peter

doi:10.1007/s00397-016-0912-0

Cited by 12 publications

(4 citation statements)

References 46 publications

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“…The loss tangents for these interfaces tend to be low (≤0.1), and in large amplitude dilatational studies they often show asymmetries in Lissajous-Bowditch plots, displaying softening in extension, and hardening in compression 22,30 . In surface shear they may display yielding behavior at a critical surface stress 31 . All these are indicators of soft disordered solid behavior.…”

Section: Resultsmentioning

confidence: 99%

Dynamic heterogeneity in complex interfaces of soft interface-dominated materials

Sagis

Liu

et al. 2019

Sci Rep

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Complex interfaces stabilized by proteins, polymers or nanoparticles, have a much richer dynamics than those stabilized by simple surfactants. By subjecting fluid-fluid interfaces to step extension-compression deformations, we show that in general these complex interfaces have dynamic heterogeneity in their relaxation response that is well described by a Kohlrausch-Williams-Watts function, with stretch exponent β between 0.4–0.6 for extension, and 0.6–1.0 for compression. The difference in β between expansion and compression points to an asymmetry in the dynamics. Using atomic force microscopy and simulations we prove that the dynamic heterogeneity is intimately related to interfacial structural heterogeneity and show that the dominant mode for stretched exponential relaxation is momentum transfer between bulk and interface, a mechanism which has so far largely been ignored in experimental surface rheology. We describe how its rate constant can be determined using molecular dynamics simulations. These interfaces clearly behave like disordered viscoelastic solids and need to be described substantially different from the 2d homogeneous viscoelastic fluids typically formed by simple surfactants.

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Section: Resultsmentioning

confidence: 99%

Dynamic heterogeneity in complex interfaces of soft interface-dominated materials

Sagis

Liu

et al. 2019

Sci Rep

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“…Only a limited works have been done on the LAOS behavior of the air-water interfaces [39][40][41][42] . Therefore, there is still a need for the advancement of this topic.…”

Section: Introductionmentioning

confidence: 99%

Nonlinear Viscoelastic Behavior of Air-Water Interface Containing Surfactant-Laden Nanoparticles

Vishal

Ghosh

2020

J. Soc. Rheol., Jpn

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Foams have a large number of applications in our daily life. Their stability depends on the thin liquid film, which consists of an aqueous phase bound by two air-water interfaces. During its processing, foam is exposed to a large deformation. Therefore, the study of the air-water interface under large amplitude oscillatory shear (LAOS) flow is highly relevant for foam stability. In this article, the LAOS behavior of the air-water interface was investigated. The interface was formed by 0.1 mol m −3 hexadecyltrimethylammonium bromide and 0.5% w/v silica nanoparticles. The LAOS study was performed by analyzing the intracycle stress waveforms and Lissajous-Bowditch curves. The Fourier transform rheology and Chebyshev polynomial approaches were used to describe the LAOS flow of the interface. The air-water interface exhibited intracycle strain-hardening and shear thickening behavior under the LAOS flow. However, at very large strain amplitude (i.e. 45%), the interface displayed intracycle shear thinning behavior.

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“…5.4). Often superimposed oscillations are considered as unwanted inertial effects [380]. However, in this case, considering the low strain amplitude at which we observe the superimposed oscillations, low frequency, and relatively high G' (in the range of 10 kP a) of the samples, the inertial effects are negligible.…”

Section: Resultsmentioning

confidence: 79%

From disorder to order : Shear rheology of macroscopically structured materials

Giménez Ribes

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From a soft matter perspective, order and disorder are key concepts in understanding material organization and behavior. Order usually refers to an arrangement or pattern in a system where its components, such as atoms, molecules, or unit cells, have a high level of organization or regularity. Systems with regular, structured arrangements, such as crystals [1], self-assembled supramolecular structures [2], or metamaterials with arranged unit cells [3,4] exhibit order. On the contrary, disorder is associated with structural components lacking a predictable spatial organization, such as amorphous solids [5] and many polymers [6]. In this thesis, entitled "From disorder to order: Shear rheology of macroscopically structured materials", we will deal with structural (dis)order in materials from a macroscopic perspective. Chapter 2 Crumpled structures as robust disordered mechanical metamaterialsThis chapter is published in a revised version as: G. Giménez-Ribes, M. Motaghian, E. van der Linden, & M. Habibi, Crumpled structures as robust disordered mechanical metamaterials. Materials & Design, 232 (2023), 112159.

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Shear localisation in interfacial particle layers and its influence on Lissajous-plots

Cited by 12 publications

References 46 publications

Dynamic heterogeneity in complex interfaces of soft interface-dominated materials

Dynamic heterogeneity in complex interfaces of soft interface-dominated materials

Nonlinear Viscoelastic Behavior of Air-Water Interface Containing Surfactant-Laden Nanoparticles

From disorder to order : Shear rheology of macroscopically structured materials

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