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1. TiO2 nanoparticles were prepared by a simple solvothermal process. On this basis, visual observation, X-ray diffraction, transmission election microscopy, UV spectrophotometry and FT-IR spectrophotometry were used to characterize the products. The experimental results indicate that the anatase TiO2 nanoparticles with narrow size distribution and high crystallinity could be obtained using lactic acid as a capping agent; and the mean diameter was approximately 5.0 nm.
2. By changing different reaction parameters, nano TiO2 powder was prepared by a solvothermal process, and a series of methods were used to characterize the products. The dispersion behavior was observed when the nano TiO2 powder under different conditions was dissolved in deionized water. And the behavior in 10 seconds and 30 seconds was photographed which need to be analyzed. Finally, the different factors effects on the stability of nano TiO2 aqueous dispersion were systematically analyzed.
3. By contrasting the water dispersibility of TiO2 nanoparticles prepared under different conditions, we found that the as-prepared powder could be easily dispersed in water to form a stable solution-like suspension and excellent dispersibility of the as-prepared TiO2 nanoparticles might be mainly ascribed to the polylactic acid polymerized by lactic acid on the surface of TiO2 nanoparticles. Since it has a strong hydrophilic, Polylactic, which coats TiO2 nanoparticles as outer membrane, made TiO2 nanoparticles disperse in water well. I believe this finding makes sense for both further study of TiO2 nanoparticles stably dispersing in a liquid and improving the stability of TiO2 nanoparticles aqueous dispersion.
Keywords: TiO2; nanoparticles; dispersion; solvothermal process
目录
第1章 前言 1
1.1 引言 1
1.2 TiO2的结构与基本性质 2
1.2.1 TiO2的结构特征 2
1.2.2 TiO2三种晶体物理性质对比 3
1.3 纳米TiO2的应用研究 4
1.3.1 纳米TiO2作为传感器材料的应用 4
1.3.2 纳米TiO2作为光催化剂的应用 5
1.3.3 纳米TiO2作为太阳能电池原料的应用 5
1.4 纳米TiO2的合成研究 5
1.4.1 液相法 6
1.4.2 溶胶-凝胶法 6
1.4.3 水解法 6
1.4.4 沉淀法 6
1.4.5 水热合成法 7
1.4.6 溶剂热合成法 7
1.5 影响TiO2纳米粒子分散性的因素 7
1.5.1 pH值 7
1.5.2 电解质 8
1.6 本论文研究目的与意义 8
第2章 实验部分 10
2.1 实验试剂和仪器 10
2.2 表征仪器 10
2.3 实验方法 11
2.3.1 制备方法 11
2.3.2 沉降性测试 11
第3章 结果与讨论 12
3.1 水溶性TiO2的表征 12
3.2 分散性测试 14
3.2.1 反应机理 14
3.2.2 反应参数对样品分散性的影响 15
第4章 总结 21
致谢 22
参考文献 23
第1章 前言
1.1 引言
根据最近几年的研究发现，多相光催化领域内锐钛矿型TiO2纳米粉体因其独特优势，即无毒性、稳定性好、催化活性高、抗氧化能力强等而受到业内广泛青睐[1,2]。TiO2纳米颗粒所具有的独特的颜色效应、光催化作用、紫外线屏蔽等功能为其在太阳能电池[3,4]、传感器[5]甚至生物医学[6,7]等方面均发挥出了卓越的功效，因而，TiO2纳米粒子的制备与应用的研究更是受到了人们的极大关注[8-11]。
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