| 吸附法原位制备Ag/ SiO2 纳米复合材料 |
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| 引用本文： | 毛从文,蒋新. 吸附法原位制备Ag/ SiO2 纳米复合材料[J]. 复合材料学报, 2006, 23(4): 88-94 |
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| 作者姓名： | 毛从文 蒋新 |
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| 作者单位： | 浙江大学材料与化学工程学院杭州 310027 |
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| 基金项目： | 国家自然科学基金（20476088）;浙江省科技计划项目（2005C310027） |
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| 摘 要： | 以纳米SiO2 为载体, 以其富集水的表面吸附层作为纳米反应器制备了Ag 纳米粒子, 研究了水浓度对吸附和反应的影响。体系中NaOH 加入量一定的条件下, 硅胶表面NaOH 的平衡吸附量随着水浓度(0 、0105 %、0110 %、0125 %、0150 %、1. 00 %) 的增加而增加, 且存在两个突变区域(由0 增至0105 %和由0125 %增至0150 %) 。通过XRD、TEM 分析发现生成的银粒子(或氧化银) 团聚现象随水浓度的增加而逐渐减弱, 在硅胶表面分布越来越均匀, 晶粒粒径也逐渐减小。当水浓度约为0. 50 %时, 生成的Ag 或Ag2O 粒子粒径多数在5 nm 以下, 且均匀分布在SiO2 表面。根据Ag + 的还原机理和吸附过程基本原理, 认为吸附水层的形成导致生成Ag 粒子的反应场所由硅胶表面转移到吸附水层中, 造成了Ag 粒子形貌的变化。
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| 关 键 词： | 吸附层 Ag/ SiO2 过程机理 反应控制 |
| 文章编号： | 1000-3851（2006）04-0088-07 |
| 收稿时间： | 2005-09-20 |
| 修稿时间： | 2005-09-202005-12-12 |
Synthesis of Ag/ SiO2 nanocomposite material by adsorption phase nanoreactor technique |
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| MAO Congwen,JIANG Xin. Synthesis of Ag/ SiO2 nanocomposite material by adsorption phase nanoreactor technique[J]. Acta Materiae Compositae Sinica, 2006, 23(4): 88-94 |
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| Authors: | MAO Congwen JIANG Xin |
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| Affiliation: | College of Materials and Chemical Engineering| Zhejiang University| Hangzhou 310027| China |
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| Abstract: | Ag nanoparticles were synthesized in a nanoreactor formed by an adsorption layer on the silica surface.The effects of concentration of water on the process of adsorption and reaction were analyzed.When the mass fraction of NaOH keeps constant,the equilibrium content of NaOH adsorbed on SiO_2 increases with the increase of concentration of water,which changes from 0 to 1.00%.Two jump regions of equilibrium content are found from 0 to 0.05% and from 0.25% to 0.50%.Analysis by XRD and TEM indicates that the agglomeration of Ag or Ag_2O particles becomes more moderate,its dispersion on the surface SiO_2 becomes more uniform,and its grain size becomes smaller with the increase of concentration of water.The minimum grain size and uniform dispersion can be achieved when the concentration of water is 0.50%.Based on the reduction mechanism of Ag~+ and essential principle of the adsorption process on the surface of SiO_2,it can be concluded that the water-rich adsorption layer on the surface of SiO_2 is formed gradually with the increase of water concentration and the region of Ag generation changes from the surface of SiO_2 to the water-rich adsorption layer,where the concentration of NaOH is so high that most of Ag are generated in it. |
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| Keywords: | adsorption layer Ag/SiO2 process and mechanism reaction control |
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