以凝聚子聚集体为模板制备TiO_2纳米材料及其性质研究  

Preparation of TiO_2 Nano-materials Using Gelator Aggregation as Template and Its Properties

作　　者：鞠维刚[1] 张晓宏[1] 吴世康[1] 

机构地区：[1]中国科学院理化技术研究所

出　　处：《高等学校化学学报》2004年第12期2308-2311,共4页Chemical Journal of Chinese Universities

基　　金：中国科学院知识创新工程重大项目基金资助

摘　　要：合成了一种可用作凝聚子 ( Gelator)并带正电荷的胆固醇酯类化合物 .研究其在溶剂中的聚集行为 ,并以其聚集体为模板 ,通过 Sol-gel方法制备了一维 Ti O2 纳米材料 .改变凝聚子和 Ti O2 前驱体的用量比 ,用扫描电镜观察到生成的 Ti O2 纳米材料具有不同的尺寸和形貌 ,表明二者的比例对于体现模板转录功能的优劣具有重要意义 .圆二色谱 ( CD)表明 ,形成的凝胶聚集体具有手性特征 . XRD结果表明 ,生成的 Ti O2 纳米材料具有锐钛矿晶型 .通过光催化染料褪色实验 ,对所得 Ti O2 纳米材料的光化学活性进行了初步研究 .A cholesterol ester compound with positive charges used as a gelator was synthesized. The aggregation behavior of this compound in solvents was studied. Its supra-molecular aggregation was used as a template for the preparation of one-dimensional TiO 2 nano-materials through the sol-gel process. Different molar ratios of gelator to TiO 2 were applied to the preparation of nano-materials in the experiments. The size and the shape of TiO 2 nano-materials were observed by means of scanning electronic microscopy. The results indicated that the molar ratio of the precusor to the gelator in the experiments is an important factor for the success of the template transcription. The CD spectrum of the gel was recorded for confirming the relationship between the chiral molecular structure and the aggregated gel. The XRD results demonstrate that the TiO 2 nano-materials possess the anatase form of crystals. Primary photo-catalytic experiments were also carried out in this work for testing the photo-activity of the nanomaterials obtained by the bleaching process of dyestuff.

关 键 词：胆固醇酯类化合物 凝聚子 纳米材料 溶胶-凝胶过程 二氧化钛光催化 

分 类 号：O648[理学—物理化学]