Abstract
The preparation of colloidal particles of platinum ‘in situ’ in water-in-oil microemulsions formed by the aerosol-OT (AOT)–water–heptane system and the hexadecyltrimethylammonium bromide (CTAB)–water–heptane–chloroform system is described. In both systems, particle growth is controlled and particle sizes of the order of a nm or so are obtained. In the AOT system, there is only a weak correlation between the particle size and droplet size. To obtain further insight into the mechanism of particle growth, the kinetics of the process were investigated. Nucleation particles (Pt°) are produced in an initial step by the reduction of PtCl2–6(PtIV) using hydrazine as reducing agent. The kinetics of this stage were found to be erratic and this was attributed to a reaction of AOT with hydrazine. This also had the effect of flocculating the microemulsion system (forming networks) which drastically perturbed the size measurements made using the sedimentation velocity (ultracentrifuge) method. Fractal growth was also indicated by light-scattering measurements.
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