P-2 超音波場での金ナノ粒子生成における水素イオン濃度の影響

概要

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Metal nanoparticles have been widely studied in recent years, as their physical and chemical propertiesto apply in various fields of industry are often quite different from those of the bulk materials. Various methods to prepare nanoparticles from metal ions in an aqueous solution have been proposed, and the sonochemical preparation is one of the unique methods because the organic additives such as alcohols and surfactants can be used as the reducing agents. The formation rate of gold nanoparticles was studied using an ultrasonic cleaning bath and it was found that the formation rate was controllable by selecting the type of the additives as well as the hydrogen ion concentration in the solution. When lower alcohols such as methanol or ethanol were used, the formation rate of gold nanoparticles in the neutral region of pH was rapid comparing with that in acid region or alkaline region. It was also observed that gold nanoparticles aggregated at low pH. On the other hand, the formation rate using higher alcohols such as pentanol or hexanol was higher than those using lower alcohols at low pH conditions. However, the formation rate became extremely slow at higher pH than 9.5, when butanol, pentanol or hexanol was used as an additive under the ultrasound field with 200 or 600 kHz frequencies. Moreover, formation rate with surfactant depends on the pH values
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