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

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

SUBMITTER: Sagis LMC 

PROVIDER: S-EPMC6393553 | biostudies-literature | 2019 Feb

REPOSITORIES: biostudies-literature