Dynamic heterogeneity in complex interfaces of soft interface-dominated materials

Leonard M.C. Sagis, Bingxue Liu, Yuan Li, Jeffrey Essers, Jack Yang, Ahmad Moghimikheirabadi, Emma Hinderink, Claire Berton-Carabin, Karin Schroen

Research output: Contribution to journalArticleAcademicpeer-review

2 Citations (Scopus)

Abstract

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.

LanguageEnglish
Article number2938
JournalScientific Reports
Volume9
Issue number1
DOIs
Publication statusPublished - 27 Feb 2019

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Surface-Active Agents
Rheology
Atomic Force Microscopy
Molecular Dynamics Simulation
Nanoparticles
Polymers
Proteins

Cite this

Sagis, Leonard M.C. ; Liu, Bingxue ; Li, Yuan ; Essers, Jeffrey ; Yang, Jack ; Moghimikheirabadi, Ahmad ; Hinderink, Emma ; Berton-Carabin, Claire ; Schroen, Karin. / Dynamic heterogeneity in complex interfaces of soft interface-dominated materials. In: Scientific Reports. 2019 ; Vol. 9, No. 1.
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abstract = "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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Dynamic heterogeneity in complex interfaces of soft interface-dominated materials. / Sagis, Leonard M.C.; Liu, Bingxue; Li, Yuan; Essers, Jeffrey; Yang, Jack; Moghimikheirabadi, Ahmad; Hinderink, Emma; Berton-Carabin, Claire; Schroen, Karin.

In: Scientific Reports, Vol. 9, No. 1, 2938, 27.02.2019.

Research output: Contribution to journalArticleAcademicpeer-review

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T1 - Dynamic heterogeneity in complex interfaces of soft interface-dominated materials

AU - Sagis, Leonard M.C.

AU - Liu, Bingxue

AU - Li, Yuan

AU - Essers, Jeffrey

AU - Yang, Jack

AU - Moghimikheirabadi, Ahmad

AU - Hinderink, Emma

AU - Berton-Carabin, Claire

AU - Schroen, Karin

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AB - 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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