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In this work we report a study on the determination of the shape of aggregated gold colloids, obtained by adding pyridine to a solution of pure gold nanoparticles prepared by laser ablation in water studying their dynamic behavior. We have simultaneously measured the translational and rotational diffusion coefficients of dilute solutions of the as-prepared and aggregated gold nanoparticles by polarized and depolarized dynamic light scattering. An increase of the hydrodynamic radius from 26 to 135 nm and a decrease of the rotational diffusion coefficient of two order of magnitude are measured with increasing the pyridine concentration, both correlated to the aggregate formation. The dynamic properties of nanoaggregates have been interpreted by applying a model which allows a direct evaluation of translation and rotational diffusion coefficients of a chain of spherical particles by changing the number and …
Springer Netherlands
Publication date: 
1 Dec 2012

M Zimbone, P Musumeci, P Baeri, E Messina, S Boninelli, G Compagnini, L Calcagno

Biblio References: 
Volume: 14 Issue: 12 Pages: 1308
Journal of Nanoparticle Research