为了考察中空核壳结构的形成过程以及液体石蜡影响核壳结构形成的机制，将不同液体石蜡含量的二氧化钛凝胶微球以10 ℃/min的升温速率进行热处理，考察不同温度下所得粒子的结构以及确定核壳结构的开始形成温度。实验中，取样温度分别为200、400、600、700、800和900 ℃。为了确定核壳结构的开始形成温度，对未添加液体石蜡以及添加1 wt.%液体石蜡所得二氧化钛微球在不同温度下热处理所得样品进行了扫描电子显微镜（SEM）的表征，如图即为不同温度下所得二氧化钛微球的SEM照片。从图中可知，对于图中所示两种二氧化钛微球，以10 ℃/min升温至600℃时，仍未形成中空核壳结构。而在升温至700 ℃所得粉体样品，可见明显的核壳结构，由此可以判断，核壳结构的形成开始于600至700 ℃之间的某一温度。 

In order to investigate the formation process of the hollow core-shell structure and the mechanism of the effect of liquid paraffin on the formation of the core-shell structure, titanium dioxide gel microspheres with different liquid paraffin content were heat treated at the heating rate of 10 ℃/min, the structures of the particles obtained at different temperatures were investigated and the initial formation temperature of the core-shell structure was determined.  In the experiment, the sampling temperatures were 200, 400, 600, 700, 800 and 900 ℃ respectively.  In order to determine the initial formation temperature of the core-shell structure, the samples obtained by heat treatment at different temperatures were characterized by scanning electron microscopy (SEM) with titanium dioxide microspheres without and with 1 wt.% liquid paraffin wax added.  As can be seen from the figure, for the two kinds of titanium dioxide microspheres shown in the figure, the hollow core-shell structure still did not form when the temperature was raised to 600℃ at 10 ℃/min.  When the powder sample is heated to 700 ℃, the obvious core-shell structure can be seen, which can be judged that the formation of the core-shell structure begins at a temperature between 600 and 700 ℃.