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Issue 11, 2008
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Phonon dispersion curves of two-dimensional colloidal crystals: the wavelength-dependence of friction

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Abstract

Digital video-microscopy measurements are reported for both elastic bandstructures and overdamped phonon decay times in two-dimensional colloidal crystals. Both quantities together allow the determination of the friction coefficients along various high symmetry directions in q-space. These coefficients contain valuable information about the hydrodynamics forces acting between the colloidal particles. We find Stokes-like friction for phonons near the edge of the first Brillouin zone and vanishing friction coefficients for long wavelength phonons. The effect of this wavelength-dependence in real-space is further investigated by simulating a crystal with constant friction (Langevin simulation) and comparing experimentally measured and simulated particle auto-correlation functions.

Graphical abstract: Phonon dispersion curves of two-dimensional colloidal crystals: the wavelength-dependence of friction

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Publication details

The article was received on 30 May 2008, accepted on 01 Jul 2008 and first published on 16 Sep 2008


Article type: Paper
DOI: 10.1039/B807881E
Citation: Soft Matter, 2008,4, 2199-2206
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    Phonon dispersion curves of two-dimensional colloidal crystals: the wavelength-dependence of friction

    J. Baumgartl, J. Dietrich, J. Dobnikar, C. Bechinger and H. H. von Grünberg, Soft Matter, 2008, 4, 2199
    DOI: 10.1039/B807881E

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