Size-controlled preparation of hollow silica spheres and glyphosate release  

中空二氧化硅微球的尺寸控制制备及草甘膦释放(英文)

作　　者：刘纯[1,2] 殷恒波[1] 王爱丽[1] 吴占敖[3] 吴刚[3] 姜涛[3] 沈玉堂[1] 姜廷顺[1] 

机构地区：[1]江苏大学化学化工学院,镇江212013 [2]北华大学化学与生物学院,吉林132013 [3]中国人民解放军第359医院,镇江212001

出　　处：《Transactions of Nonferrous Metals Society of China》2012年第5期1161-1168,共8页中国有色金属学报（英文版）

基　　金：Projects (11KJB530002, CX10B-259Z) supported by Research Funds from Jiangsu Provincial Department of Education, China;Project (10zxfk35) supported by Sichuan Province Nonmetallic Composites and Functional Materials Key Laboratory Project, China

摘　　要：Different-sized hollow SiO2 spheres of 249–1348 nm in diameter were successfully prepared by using Na2SiO3 as the precursor and using polystyrene and polystyrene-methyl acrylic acid latexes as the templates. The diameter and shell thickness of the hollow SiO2 spheres increase with increasing the latex template diameter at a given mass ratio of SiO2 to latex template. The diameter and shell thickness of the hollow SiO2 spheres also increase with increasing the mass ratios of SiO2 to latex template. The presence of carboxylic acid groups on the surfaces of polystyrene-methyl acrylic acid latex templates favors the formation of dense and uniform SiO2 shells. The hollow SiO2 sphere is constructed by mesoporous shell with large specific surface area. When glyphosate is used as a release model chemical, glyphosate release rate is tuned by varying the shell thickness.以硅酸钠为硅源,聚苯乙烯与苯乙烯-甲基丙烯酸共聚乳液为模板,制备直径为249～1348nm的不同尺寸的中空二氧化硅微球。在给定二氧化硅与乳液模板质量比的前提下,中空二氧化硅微球直径与壳厚度随着乳液模板直径的增加而增加。中空二氧化硅微球直径与壳厚度也随着二氧化硅与乳液模板质量比的增加而增加。苯乙烯-甲基丙烯酸共聚乳液模板表面存在羧基有利于形成致密、均匀的二氧化硅微球球壳。中空二氧化硅球壳具有介孔结构和大的比表面积。将草甘膦用作释放模型化合物时,其释放速率可通过改变球壳厚度而进行调节。

关 键 词：hollow SiO2 sphere POLYSTYRENE polystyrene-methyl acrylic acid glyphosate release 

分 类 号：O613.72[理学—无机化学]