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| - Colloidal Dispersions of Gold Rods Characterized byDynamic Light Scattering and Electrophoresis
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| - The colloidal stability of nearly monodisperse aqueous dispersions of rod-shaped gold particles is studiedby dynamic light scattering and electrophoresis. The average length of the gold particles is adjusted between39 and 730 nm, and the diameter is about 17 nm. The translational diffusion coefficients are consistentwith calculations for single nonaggregated rods with a 10−15 nm thick poly(vinyl pyrrolidone) (PVP)adsorption layer. This supports the colloidal stability observed. Electrophoresis measurements show thatthe PVP-stabilized gold rods are negatively charged with a ζ potential of about −47 mV, which accordingto interaction calculations is sufficient for double-layer stabilization. Gold-sphere dispersions are investigatedfor comparison. It turns out that PVP-stabilized gold spheres have a ζ potential similar to that of thecolloidal rods.
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