Abstract
Silver nanoparticles were synthesized in reverse micelles consisting of sucrose fatty acid esters by dissolving reactant powder in the water pool of reverse micelles through the solid-liquid extraction. Silver nanoparticles having various sizes and shapes were obtained at high concentration. The size of silver nanoparticles was controlled by reaction temperature. Moreover, the size of silver nanoparticles was dependent upon the average esterification degree of sucrose fatty acid esters forming reverse micelles. The wavelength in the peaks, which corresponded upon the localized surface plasmon resonance of resultant silver nanoparticles, was correlated with their sizes.
Highlights
In recent years, the production and applications of metal nanoparticles have rapidly been increased in the field of nanotechnology, since their novel physical and chemical properties are different from those of bulk substances due to their extremely small size and large specific surface area, and metal nanoparticles exhibit specific colors due to localized surface plasmon resonance (LSPR) corresponding to the wavelength of light that induces the largest electromagnetic field on the nanopartices, when metal nanoparticles are impinged by a beam of light [1]
We examined the preparation of silver nanoparticles in reverse micelles of sucrose fatty acid esters by using solid-liquid extraction method to address how the preparation conditions such as the reaction temperature and the composition of surfactants affect the size and shape of silver nanoparticles
In order to successively supply reactants consumed for the formation of silver nanoparticles to the water pools of reverse micelles, which are reaction fields, and produce silver nanoparticles at high concentration, we have employed solid-liquid extraction method instead of the conventional injection method [8]
Summary
The production and applications of metal nanoparticles have rapidly been increased in the field of nanotechnology, since their novel physical and chemical properties are different from those of bulk substances due to their extremely small size and large specific surface area, and metal nanoparticles exhibit specific colors due to localized surface plasmon resonance (LSPR) corresponding to the wavelength of light that induces the largest electromagnetic field on the nanopartices, when metal nanoparticles are impinged by a beam of light [1]. The solid-liquid extraction method is carried out by mixing solid reactants with the reverse micellar solution containing already a certain amount of water. This method can dissolve reactants until their dissolution reaches saturation in water pool. We have reported that silver nanoparticles are prepared in reverse micelles of sucrose fatty acid esters by using the conventional injection method [10]. We examined the preparation of silver nanoparticles in reverse micelles of sucrose fatty acid esters by using solid-liquid extraction method to address how the preparation conditions such as the reaction temperature and the composition of surfactants affect the size and shape of silver nanoparticles
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