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249～1348 nm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.
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.
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