《纳米二氧化硅的制备》-毕业论文.docVIP

易少琴：纳米二氧化硅的制备 安徽工程大学毕业设计（论文） - - 纳米二氧化硅的制备 (安徽工程大学生物与化学工程学院 芜湖 241000) 摘要 纳米二氧化硅颗粒具有常规材料所不具备的特殊性能，因而在光子晶体、催化剂载体、精密陶瓷材料、橡胶、涂料、色谱填料及高分子复合材料等许多领有 着非常广泛的应用前景。 目前，对纳米二氧化硅的研究主要包括制备、微观结构、宏观物性和应用等四个方面，其中制备技术是关键，因为制备工艺对其微观结构和宏观物性具有极重要的影响。 本论文采用稻壳热解法制备纳米二氧化硅，是以稻壳为原料，选择不同的热解温度和保温时间，对稻壳进行热解，得到高纯的二氧化硅颗粒，并进行一系列的表征。在分析和研究二氧化硅的物相、微观形貌、颗粒分散效果等的基础上，优化工艺参数和试验条件，以得到最佳的试验条件。实验结果表明，其最佳工艺条件为：热解温度为560oC，保温时间为3小时，在此条件下，颜色较好，颗粒团聚较少，分散效果好，纯度高等特点。 关键词：SiO2; 纳米; 稻壳; 制备 Preparation of nano-silica Yi Shaoqin (College of Biological and-Chemical Engineering,Anhui polytechnic University,wuhu,241000) Abstract Nano silicon dioxide usually has many special properties which contribute it to far-ranging of application，and it can be used in these field as follow:photon crystal，catalystcarrier，rigid ceramic material，gum，dop，chromatogram filling，macrom- olecule composite material and so on. . At present，the study of nano-silicon dioxide includes preparation method，micro surtcutre，microscopical physical properties and application.Among these，the prepa -ration is the key，because process and control of preparation have important effect on the micro structure and microscopical physical properties. The method of preparing nano-silica by thermal processing rice husk uses rice husk as raw material,basing on the changing of reactant temperature and reactant time.The prepared silicon dioxide particles were characterized.As a result,the optimal experiment conditions could be defined,nano silicon dioxide particles were prepared successfully on the condition of 560oC and keeping warm for 3h,the results indicate that nano-silicon dioxide has amorphous structure,well dispersion homogeneous and so on. Key Words : SiO2 ; Nano; Rice husk; Preparation 目录 TOC \o 1-3 \h \z \u HYPERLINK \l _Toc327012591 引言 PAGER