Kinetics of the Formation of Nano-Sized Platinum Particles in Water-in-Oil Microemulsions

Plasmonic Nanoparticles and Their Conjugates: Preparation, Optical Properties and Antimicrobial Activity

“…The dominantly tetrahedral nanoparticles have an average size of cap 4.8 nm, the dominantly cubic nanoparticles have an average size of 7.1 nm, and the dominantly spherical nanoparticles have an average size of 4.9 nm [60,63] . The effect of emulsifier type and temperature on the kinetics of the formation of platinum nanoparticles in water(w)/ heptane(o) microemulsions by chemical reactions of PtCl 6 2-were examined with time resolved UV-V is absorption spectroscopy [64] . The surfactant used were poly(ethylene glycol) monododecyl ethers (C 12 E 4 (Brij 30), C 12 E 5 , C 12 E 6 ), AOT, mixtures of the alcohol ethoxylates and AOT and the reducing agent NaBH 4 .…”

Phase diagrams of non-ionic microemulsions containing reducing agents and metal salts as bases for the synthesis of bimetallic nanoparticles

“…For the synthesis of metallic nanoparticles the metal source, e.g. a metal salt, is solubilized in the aqueous phase of a water-in-oil microemulsion, whereas the reducing agent, such as hydrazine or sodium borohydride, is added either as a solid compound [1][2][3], solubilised in a second water-in-oil microemulsion [4][5][6][7][8][9] or in a solvent. [10] Excellent reviews of the synthesis of inorganic nanoparticles via microemulsions are refs.…”

“…At the same time, the metal reduction will take place in the aqueous phase resulting in monodisperse inorganic nanoparticles. Although the water droplet size seems to have an effect on the size of the particles, [7] , [8,9,[14][15][16]] the nucleation and growth of the particles is not understood yet. In some systems the resulting particles were found to be of the same size, while in other systems they were much larger than the water droplets.…”

“…[8,32,34,38,46] It was found that the platinum ions have little effect on the water droplet size and that the reaction rate of platinum particle formation was considerable lower in microemulsions based on non-ionic alkyl polyethyleneoxide surfactants compared to microemulsions based on AOT. [8] The size of the synthesized particles was lower than 7 nm, [8,32,34] the particles had a narrow size distribution, [32] and the bimetallic particles were found to be larger than the pure counterparts. [38] Alloyed [32,46] and core-shell particles [38] were reported and it was shown that the electrocatalytic properties can be enhanced by increasing the amount of metal in the platinum-metal alloys.…”

Dynamic Behaviors of Molecular Assemblies at Liquid/Liquid Interfaces Studied by Time-Resolved Quasi-Elastic Laser Scattering Spectroscopy

“…20 AOT is one of the most frequently used surfactants in a variety of chemical reactions. 18,19 We chose heptane as an oil phase. We measured the change in interfacial tension induced by the adsorptions and collapses of AOT microemulsions and the subsequent adsorption of the AOT molecules at the water/heptane interface.…”