CuO/SiO_2制备过程中吸附质相间分配比的调控及其对粒径影响的研究  

Study on the Regulation of the Absorbate’s Distribution and Its Effect on the Size of the Nanoparticles During the Preparation of Cu/SiO_2

作　　者：蒋新[1] 王金[1] 李元朴[1] 范冬冬[1] 

机构地区：[1]浙江大学化工系,杭州310027

出　　处：《化学学报》2010年第11期1077-1082,共6页Acta Chimica Sinica

基　　金：国家自然科学基金(Nos.20776126;20876137)资助项目

摘　　要：吸附相反应过程中,吸附层是反应的场所,吸附质在吸附层和本体溶液中的分配对吸附层中的反应和粒子的形成、生长过程有重大影响.通过定义相间分配比的概念,研究了不同吸附质种类、不同温度和水量条件下吸附质相间分配比的变化规律.采用XRD和TEM等手段考察了不同条件下制备所得样品的粒子大小、形貌等,并与相间分配比的变化趋势相比较,得到了相间分配比对粒径的调控规律.研究发现不同吸附质在相间分配比上存在的差异导致了晶粒粒径的变化,Cu(OAc)2的相间分配比大于NaOH的相间分配比,因此以Cu(OAc)2为吸附质制备得到的CuO粒子较小.同时在常温(0～40℃)和低水量条件下时,相间分配比的变化也是导致粒径变化的主要因素,温度升高和水量增加均导致相间分配比变大进而导致粒径变小.In the process of adsorption phase reaction, the adsorption layer is the reaction field. The distribution of the adsorbate in the adsorption and ethanol bulk has great effect on the reaction happened in the adsorption layer and the formation and growth of the particles. After defining the notion of distribution, the research studied the change law of different kinds of adsorbates＇ distribution under different temperature and water volume. With methods such as XRD and TEM, the sizes and appearances of the sample particles that were prepared under different conditions were investigated. And after compared with corresponding changing trend in distribution, the regulation rules of distribution＇s effect on particle size was got. The study also showed that different adsorption＇s distribution had lead to the change of particle size. Because the distribu- tion of Cu（OAc）2 is bigger than that of NaOH, the particle size of the CuO which made from the preparation of Cu（OAc）2 is smaller. The study also found that the distribution of the absorbate was a key factor for the particle size when the experiment is undertaken under normal temperature （0-40 ℃） or the water volume is low. Either increasing of temperature or raising of water volume will lead to a bigger distribution, which will result in decreasing of particle size.

关 键 词：吸附相反应技术 相间分配比 粒径 

分 类 号：O647.32[理学—物理化学]