Two-Dimensional Dynamics of Metal Nanoparticles on the Surface of Thin Polymer Films Studied with Coherent X Rays

Journal Article · Fri Jan 26 00:00:00 EST 2007 · Physical Review Letters

DOI:https://doi.org/10.1103/PHYSREVLETT.98.047801· OSTI ID:20861649

Streit, S; Gutt, C; Sternemann, H; Tolan, M ^[1]; Chamard, V ^[2]; Robert, A ^[3]; Sprung, M ^[4]

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1. Fachbereich Physik, Universitaet Dortmund, Otto-Hahn-Strasse 4, 44221 Dortmund (Germany)
2. TECSEN UMR CNRS 6122, Universite Paul Cezanne, 13397 Marseille Cedex 20 (France)
3. European Synchrotron Radiation Facility, BP 220, 38043 Grenoble Cedex (France)
4. Argonne National Laboratory, 9700 S. Cass Avenue, Bldg. 432 E003 Argonne, Illinois, 60439 (United States)

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}){approx}exp[-({gamma}{tau}){sup {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.

• OSTI ID: 20861649
• Journal Information: Physical Review Letters, Vol. 98, Issue 4; Other Information: DOI: 10.1103/PhysRevLett.98.047801; (c) 2007 The American Physical Society; Country of input: International Atomic Energy Agency (IAEA); ISSN 0031-9007
• Country of Publication: United States
• Language: English

Related Subjects

71 CLASSICAL AND QUANTUM MECHANICS
GENERAL PHYSICS
AGING
COHERENT RADIATION
FILMS
GLASS
GOLD
MATTER
NANOSTRUCTURES
PHOTONS
POLYMERS
RELAXATION
STRUCTURE FACTORS
TWO-DIMENSIONAL CALCULATIONS
X RADIATION
X-RAY SPECTROSCOPY