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Effect of Irradiation of Ultrasound on Formation of Metal Nanoparticles

超声波照射对金属纳米颗粒形成的影响

基本信息

批准号：
13650819
负责人：
MORI Yasushige
金额：
$ 2.24万
依托单位：
DOSHISHA UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (C)
财政年份：
2001
资助国家：
日本
起止时间：
2001 至 2002
项目状态：
已结题

项目摘要

The preparation technique of ultrafine particles is one of the important and elemental technologies for the nanotechnology. New methods for preparing nanoparticles are seeking for the functional properties and mono size of particles and a preparative procedure using ultrasonic energy is one of new methods. In this study, the gold nanoparticles were mainly prepared in ultrasound field, and the effect of clay gel on the sonochemical reaction was also examined.At first, new methods for the particle size analysis were established, which were using a small angle X-ray scattering method and a light absorbance method combined with Mie theory.The gold nanoparticle was prepared from chloroauric acid aqueous solution using alcohol or surfactant as a radical source in the ultrasound field of 200 kHz. The good condition to prepare gold nanoparticles was in the neutral solution of pH. In general, the reaction rate increased with the carbon chain of the alcohol, but the rate was extremely slow at pH higher than 10 with the long carbon chain of the alcohol. When the ultrasonic wave was 600 kHz, the results were almost same as those at 200 kHz. On the other hand, the preparation rate of gold nanoparticles at 20 kHz ultrasound increased with pH values and the carbon chain of the alcohol.The reaction rate in the solution dispersed clay particles was slower than the case that clay gel was not contained, and the particle size distribution also extended. Although the particle size was not smaller than that expected, the nanoparticles dispersed well.

超微粒子的制备技术是纳米技术的重要基础技术之一。制备纳米粒子的新方法是追求粒子的功能性和尺寸的单一化，利用超声能量制备纳米粒子是一种新方法。本研究主要在超声场中制备金纳米粒子，并考察了粘土凝胶对超声化学反应的影响。首先，建立了新的粒径分析方法，which哪一个were using运用a small小angle角X-以氯金酸水溶液为原料，以乙醇或表面活性剂为自由基，采用紫外光散射法、光吸收法和Mie理论相结合的方法制备了金纳米粒子在200 kHz的超声波场中。一般情况下，反应速率随醇的碳链增加而增加，但当醇的碳链较长时，反应速率在pH大于10时非常缓慢。当超声波为600 kHz时，结果与200 kHz时的结果几乎相同。另一方面，在20 kHz超声作用下，金纳米粒子的制备速率随着pH值和醇的碳链的增加而增加，在溶液中分散粘土粒子的情况下，反应速率比不含粘土凝胶的情况下慢，粒径分布也随之扩大。虽然粒径不小于预期，但纳米颗粒分散良好。