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The photoinduced electron transfer reactions from nanosized CdS particles synthesized in micelles of cadmium lauryl sulphate and sodium lauryl sulphate to various dialkyl viologens is measured for a molar ratio of cadmium to sulphide ions equal to 2. — The yield of the reduced viologens obtained by CdS irradiations is miximum in the case of C1 viologen, which decreases gradually with increase...
Functionalized surfactant micelles are used to prepare small metallic copper particles. At low water content, small metallic particles are formed. By increasing the water content, passivation takes place.
Functionalized reverse micelles are used to control the size and the polydispersity of the metallic and semiconductor particles. The size of the particles can be controlled, either by the amount of water solubilized in the droplets, or by the solvent used to form reverse micelles, or by adding macrocyle molecules.
In this short note, we show the formation of colloidal copper mettalic particles synthesized in situ in mixed reverse micelles. From the differences in the absorption spectra it is deduced that the size of the particles decreases with the water content.
Longitudinal acoustic phonons with few-GHz frequency were detected in three-dimensional supracrystals [1] (with face-center cubic lattice) of 7-nm cobalt nanocrystal spheres [2]. In analogy with usual atomic crystals, where longitudinal acoustic phonons propagate with the speed of sound through coherent movements of atoms of the lattice out of their equilibrium positions [3], in these supracrystals...
Using femtosecond laser pulses, we have observed in real time the coherent motion of nanocrystals self-assembled in a three-dimensional (3D) supra-crystal. The self-organisation of nanosystems is of great interest since it leads to the elaboration of mesoscopic materials which have specific physical properties differing both from those of the bulk and of the nano-material. The nanostructures that...
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