Heterogeneous and anisotropic dynamics of a 2D gel

Details Heterogeneous and anisotropic dynamics of a 2D gel Heterogeneous and anisotropic dynamics of a 2D gel

2012-02-03

arxiv.org/abs/1202.0673v1

Phys. Rev. Lett. 108, 105701 (2012)

Physics

Condensed Matter

Soft Condensed Matter

Scientific paper

10.1103/PhysRevLett.108.105701

We report X-ray Photon Correlation Spectroscopy (XPCS) results on a bidimensional (2D) gel formed by a Langmuir monolayer of gold nanoparticles. The system allows an experimental determination of the fourth order time correlation function which is compared to the usual second order correlation functions and to the mechanical response measured on macroscopic scale. The observed dynamics is anisotropic, heterogeneous and super-diffusive on the nanoscale. Different time scales, associated with fast heterogeneous dynamics inside 2D cages and slower motion of larger parts of the film, can be identified from the correlation functions.

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