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Kinetics of the formation of nano-sized platinum particles in water-in-oil microemulsions

Hanna Härelind Ingelsten (Institutionen för teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Rahul Bagwe ; Anders Palmqvist (Institutionen för teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Magnus Skoglundh (Institutionen för teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Christer Svanberg (Institutionen för fysik) ; Krister Holmberg (Institutionen för teknisk ytkemi ; Kompetenscentrum katalys (KCK)) ; Dinesh Shah
Journal of Colloid and Interface Science (0021-9797). Vol. 241 (2001), 1, p. 104-111.
[Artikel, refereegranskad vetenskaplig]

The effect of surfactant type and temperature on the kinetics of the formation of platinum nanoparticles in water-in-oil microemulsions by chemical reduction of PtCl6(2-) were examined with time-resolved UV-vis absorption spectroscopy. The surfactants used were poly(ethylene glycol)monododecyl ethers (C12E4, C12E5, C12E6), sodium bis(2-ethylhexyl)sulphosuccinate (AOT), and mixtures of the alcohol ethoxylates and AOT. The oil domain was n-heptane. The microemulsion droplet size was measured by a dynamic light scattering technique (photon correlation spectroscopy) and the final platinum particle size was determined by transmission electron microscopy. The reaction rate for platinum particle formation was approximately the same in microemulsions based on either of the alcohol ethoxylates but considerably lower for microemulsions based on AOT. In microemulsions based on mixtures of an alcohol ethoxylate and AOT the reaction rate was similar to that obtained when alcohol ethoxylate was the sole surfactant. The reaction was observed to be particularly rapid in microemulsions based on combinations of AOT and C12E5 or C12E6, and the rate was relatively independent of the ratio of the nonionic and anionic surfactants. The reaction was found to be of first order for platinum nanoparticles formed in alcohol ethoxylate-, AOT-C12E5-, and AOT-C12E6-based microemulsions, whereas in microemulsions with AOT and AOT-C12E4 the reaction rate seemed to be of higher reaction order. The platinum particles were found to be less than 5 nm in average diameter, which was consistent with the microemulsion droplet size.

Nyckelord: nanoparticle formation; platinum; w/o microemulsion; reaction rate; droplet size; particle size; nonionic surfactants; AOT

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Denna post skapades 2007-01-31. Senast ändrad 2012-02-20.
CPL Pubid: 26167


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Institutioner (Chalmers)

Institutionen för teknisk ytkemi (1999-2003)
Kompetenscentrum katalys (KCK)
Institutionen för fysik (1900-2003)


Nanovetenskap och nanoteknik
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Platinum Nanoparticles Prepared in Water-in-Oil Microemulsions -Particle Formation, Support Interaction and Catalytic Activity