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硅溶胶是一种水溶液胶体,它是以SiO_2为基体在水中分散的两相体系。由于硅溶胶的粒径大小及分布对于最终态的物理和化学性质有着严重影响,因此测定其粒度有重要意义。硅溶胶的粒径向来是用透射电镜测定,我所使用扫描电镜观察了硅溶胶粒子形貌并测定其粒度,做到制样简单,重复性好。制样方法:取一滴硅溶胶放在20ml高级醇溶剂中,充分搅匀后取一小滴在负载6×6mm被刻蚀过的盖玻片的样品台座上,真空抽干后立即用离子溅射镀膜仪喷金后待用。采用上述制样方法,用JSM—35c摄制硅溶胶的扫描显微图象,如图1a。由图1a显示了二氧化硅胶团粒子是无定形、密聚的、海绵状的几乎是平均大小的球体形貌。我们选择扫描图象上均匀分散的几百至上千个粒子加以测量,根据平均粒径公式计算,所得统计计算结果如表1。
Silica sol is an aqueous colloid, which is based on SiO 2 dispersed in water as a two-phase system. Since the particle size and distribution of silica sol have a serious impact on the physical and chemical properties of the final state, it is important to determine the particle size. The particle size of silica sol has always been measured by transmission electron microscopy, scanning electron microscopy I used to observe the morphology of silica sol particles and determine the particle size, making the sample preparation is simple, good repeatability. Preparation method: Take a drop of silica sol placed in 20ml of high alcohol solvent, stir well and then take a small drop in the load 6 × 6mm was etched cover glass sample pedestal, vacuum pumping immediately after the use of ion sputtering Spray coating machine after spraying gold stand-by. Using the above sample preparation method, a scanning micrograph of silica sol was prepared using JSM-35c, as shown in FIG. 1a. Figure 1a shows that the silica micelles are amorphous, dense, spongy, almost spherical shape with an average size. We choose to scan the image evenly dispersed hundreds to thousands of particles to be measured, according to the average particle size formula, the statistical results obtained are shown in Table 1.