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ICS-3 Seminar: Prof. Dr. Werner Steffen, Maryam Haghighi; MPI in Mainz

30.Jan.2012 14:00

Influence of the Incident Wavelength on the Apparent Diffusion Coefficient of Au Nano Rods

Dynamic light scattering is a powerful method to measure the diffusion as well as the rotation of anisotropic particles in bulk solution. Compared to free diffusion in bulk solution, movement close to an interface is influenced by several factors, e.g. hydrodynamic or electrostatic double layer forces. To investigate the dynamics of nanoparticles close to an interface Resonance Enhanced Dynamic Light Scattering (REDLS), a recently introduced experimental method, is employed. In REDLS surface plasmon polaritons are utilized as the incident electromagnetic field in a dynamic light scattering experiment.
We investigate the diffusion as well as the rotation of Au nano rods in bulk and compare these results to experiments performed.
Our results show an alteration of the apparent diffusion coefficient of the Au nano rods depending on the incident wavelengths and on the aspect ratio of Au nano rods in bulk solution and slowing down of diffusion and rotation of Au nano rods close to the surface. 

Plum M. A., Steffen W., Fytas G., Knoll W. and Menges B., Optics Express 17:10364, 2009

Plum, M. A.; Menges, B.; Fytas, G.; Butt, H. J.; Steffen, W. Review of Scientific Instruments 82, (1), 5102.


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