Preparation of Ag/SiO2 nanosize composites by a reverse micelle and sol-gel technique
Preparation of Ag/SiO2 nanosize composites by a reverse micelle and sol-gel technique
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DOI：
10.1021/la970801o
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发表时间：
1999-06-22
期刊：
影响因子：
3.9
通讯作者：
Adair, JH
中科院分区：
文献类型：
--
作者：
Li, T;Moon, J;Adair, JH
通过金属醇盐水解和缩合，在反胶束内合成了球形纳米Ag/SiO2复合颗粒。通过控制微乳液中四乙氧基硅烷（TEOS）的水解和缩合反应的相对速率，可以控制颗粒的大小和涂层的厚度。制备了尺寸在20 ~ 35 nm的复合颗粒。当水与表面活性剂的摩尔比大于10时，粒径分布变宽。利用吸收光谱对反应和生长进行动态监测。讨论了其他合成参数，如水与正硅酸盐的摩尔比和碱催化剂的用量等对反应的影响。本文还讨论了纳米复合粒子形成的可能机制。
Spherical nanosize Ag/SiO2 composite particles have been synthesized within reverse micelles via metal alkoxide hydrolysis and condensation. The size of the particles and the thickness of the coating can be controlled by manipulating the relative rates of the hydrolysis and condensation reactions of tetraethoxysilane (TEOS) within the microemulsion. Composite particles in the size range 20-35 nm are produced. As the molar ratio of water to surfactant is increased above 10, the size distribution broadens. Absorption spectra have been used to dynamically monitor the reaction and growth. The effects of other synthesis parameters, such as the molar ratio of water to TEOS and the amount of base catalyst, are discussed. Possible mechanisms for the formation of the nanocomposite particles are also discussed.