溶胶-凝胶法制备纳米二氧化钛生态材料的成就与挑战
Achievements and challenges of nanostructured Titania Eco-materials derived from Sol-Gel Processing
摘要：
从溶胶-凝胶工艺中获得的纳米结构二氧化钛需要详细的研究，以澄清从溶胶、胶溶、凝胶化到最终烧结的每个工艺步骤的最新技术水平。应用的参数，如胶溶温度和时间在当前的调查溶胶在加工的早期阶段，其特征在于通过动态光散射（DLS），并在文献中发现的其他参数进行比较。凝胶化后，将所得的纳米晶煅烧以研究向金红石的相变以及区分胶溶和未胶溶的效果，其中通过使用XRD、氮气吸附-脱附等温线和HRTEM进行表征。结果表明，溶胶在80 ℃下胶溶12 h后，得到了尺寸为4.6 nm的小而均匀的微晶。
英文摘要：
Nanostructured titania derived from the sol-gel processing requires a detailed study to clarify state-of-art of every process step starting from colloidal sol, peptization, gelation to the final sintering. The applied parameters such as peptization temperature and time in the current investigation of sol during the early stage of processing were characterized by dynamic light scattering (DLS) and compared to other parameters found in the literature. Upon gelation, the resulting anatase was calcined to study the phase transformation to rutile as well as to discriminate the effect of peptized and unpeptized in which the characterizations were carried out by using XRD, Nitrogen adsorption-desorption isotherm and HRTEM. It shows that peptizing the titania sol at 80oC for at least 12 h resulted in a small and uniform anatase crystallite with size of 4.6 nm.
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