摘要：本论文中，采用溶胶-凝胶法制备纳米二氧化钛。分别设计了乙酸和丙烯酸的正交试验方案，在不同的配比之下制成冻胶。通过正交试验发现有机酸抑制剂是影响水解的主要因素，并且丙烯酸的抑制效果更明显。通过同步热分析仪得出DSC-TG曲线，分析得出250℃、400℃、550℃三处存在物理或化学变化，其中250℃和450℃处重量变化比较明显。通过XRD谱得知500℃以下的温度不会产生金红石相，结合DSC-TG曲线可知相变温度在550℃左右。通过XRD谱计算出纳米粒径，得知丙烯酸作为抑制剂时制备的晶粒尺寸比乙酸作为抑制剂时要小，并且随着温度的升高，晶粒会越来越大。63440

毕业论文关键词：溶胶-凝胶法，正交试验，有机酸抑制剂，晶粒尺寸

Preparation and properties of nano TiO2 microspheres

Abstract：In this paper, the nano titanium dioxide is preparared by sol gel method. The orthogonal experiment of acetic acid and acrylic acid were designed respectively, and the gel was prepared under different proportion. Through orthogonal test, it is found that the organic acid inhibitor is the main factor that affects the hydrolysis, and the inhibition effect of acrylic acid is more obvious. Through the synchronous thermal analysis of the DSC-TG curve, the analysis concluded that physical and chemical changes occur at 250℃, 400℃, 550℃, in which 250 and 450 C, the weight change is more obvious. Through the XRD spectrum that when temperature below 500 degrees Celsius will not produce rutile phase, combined with the DSC-TG curve shows that the phase transition temperature is about 550℃. According to the XRD spectrum, the diameter of the nanoparticles was calculated，it is found that the grain size of acrylic acid as inhibitor is smaller than that of acetic acid, and the grain size will be larger and larger as the temperature increases.

Keywords：sol-gel，orthogonal test, organic acid inhibitor, grain size

目录

1  绪论 1

1.1  引言 1

1.2  二氧化钛的概述 1

1.2.1  二氧化钛的晶体结构 1

1.2.2  二氧化钛的物理化学性质 1

1.2.3  二氧化钛的应用 2

1.3  纳米二氧化钛的制备方法 3

1.3.1  气相法 3

1.3.2  液相法 4

1.4  溶胶-凝胶法的概述 5

1.4.1  溶胶凝胶法的基本概念 5

1.4.2  溶胶凝胶法制备粉体的特点 5

1.4.3  溶胶凝胶反应机理 5

1.5  论文设计思路 6

2  实验 7

2.1  实验药品 7

2.2  实验仪器 7

2.3  实验步骤 8

2.4  表征方法及部分参数设定 9

2.4.1  示差扫描量热法（DSC） 9

2.4.2  X射线衍射技术（XRD） 10

2.4.3  扫描电子显微镜（SEM） 10

3  结果与讨论 11

3.1  影响钛酸四丁酯水解的因素 11