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Phys Rev Lett. 2007 Jan 26;98(4):047801. Epub 2007 Jan 24.

Two-dimensional dynamics of metal nanoparticles on the surface of thin polymer films studied with coherent X rays.

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1
Fachbereich Physik, Universit├Ąt Dortmund, Otto-Hahn-Strasse 4, 44221 Dortmund, Germany.

Abstract

X-ray photon-correlation spectroscopy is used to measure the dynamic structure factor f(q,tau) of gold particles moving on the surface of thin polymer films. Above the glass transition of the polymer the peculiar form f(q,tau) approximately exp[-(Gamma tau)(alpha)] is found with 0.7 < alpha < 1.5, depending on sample age and temperature. The relaxation rates Gamma scale linearly with q, excluding a simple Brownian diffusive motion. This type of behavior, already observed in aging bulk soft matter systems, is explained by a power law distribution of particle velocities due to ballistic motion.

PMID:
17358813
DOI:
10.1103/PhysRevLett.98.047801
[Indexed for MEDLINE]
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