摘要
通过溶胶凝胶法制备了SiO2均匀包覆钛酸钾晶须(PTW)的核壳式复合微粒,并通过SEM、EDS、XRD、FTIR对这种复合微粒进行了表征。未处理的PTW在pH=2.0的酸性溶液中开始被腐蚀,并能被煮沸的浓硫酸所溶解;而SiO2PTW复合微粒耐酸性增强,在浓硫酸中煮沸40min后,仍能保持纤维形貌。PTW表面的SiO2壳层可以阻碍PTW中水溶性钾离子的析出。
Shell-core composite particles of SiO2-potassium titanate whiskers （PTW） were investigated. The structure of SiO2-PTW composite particles prepared by sol-gel method was characterized by SEM, EDS, XRD and FTIR. The results showed that the untreated PTW were corroded in acid solution at pH 2.0 and dissolved by boiling concentrated sulfuric acid. However, the SiO2-PTW composite particles might still keep their fibrous shapes in boiling concentrated sulfuric acid. Thus the acid fastness of PTW coated with SiO2 was improved because of the protection of SiO2 shell. In addition, the shell of SiO2 could hinder the water soluble potassium ions in PTW to be dissolved.
出处
《南京工业大学学报（自然科学版）》
CAS
2005年第4期8-12,共5页
Journal of Nanjing Tech University(Natural Science Edition)
基金
国家杰出青年科学基金项目(29925616)
国家自然科学重点基金项目(20236010)
国家自然科学基金项目(20246002)
国家高技术研究发展计划(863计划)项目(2003AA333010)
关键词
SIO2
钛酸钾晶须
复合微粒
溶胶-凝胶
耐酸性
水溶钾
SiO2
potassium titanate whiskers
composite particles
sol-gel
acid fastness
water soluble potassium ions
