Solution Plasma Process for Template Removal in Mesoporous Silica Synthesis
Solution Plasma Process for Template Removal in Mesoporous Silica Synthesis
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DOI：
10.1143/jjap.49.126202
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发表时间：
2010-12
影响因子：
1.5
通讯作者：
P. Pootawang;N. Saito;O. Takai
中科院分区：
文献类型：
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作者：
P. Pootawang;N. Saito;O. Takai
对水溶液中的等离子体放电进行了科学的研究，并将其应用于介孔二氧化硅合成中的模板剂去除。以Pluronic P123共聚物(EO20PO69EO20)、十二烷基苯磺酸钠、1，1，2，2，3，3，4，4，4，4-正氟-1-丁烷磺酸盐为原料，采用溶胶-凝胶法在酸性溶液中合成了高分散的球形介孔二氧化硅粒子。采用溶液等离子体法(SPP)代替传统的热焙烧方法去除模板。有机模板的去除机理是通过放电过程中产生的羟基自由基氧化来实现的。用X射线衍射仪观察到介孔结构从无序的蠕虫状结构转变为六方排列的结构，并用透射电子显微镜证实了这一转变。SPP处理后的介孔二氧化硅的热分析和官能团鉴定结果表明，有机模板剂被去除。用Brunauer-Emmett-Teller(BET)理论计算的比表面积和平均孔径结果可以用来评价等离子体的效率，表明该方法与热焙烧结果相比，在pH为3的溶液中放电时不影响孔尺寸。因此，SPP对有机模板的去除效率很高，消耗时间短，污染小。
The plasma discharge in aqueous solution was scientifically studied and applied to template removal in mesoporous silica synthesis. Highly dispersed spherical mesoporous silica particles were synthesized by the ternary surfactant system containing the Pluronic P123 copolymer (EO20PO69EO20), sodium dodecylbenzene sulfonate, and 1,1,2,2,3,3,4,4,4-nonafluoro-1-butane sulfonate, via the sol–gel method in acid solutions. The solution plasma process (SPP), instead of conventional thermal calcinations, was used to remove the template. The mechanism of the removal of the organic template occurred via oxidation by the hydroxyl radicals generated during discharge. The transformation of a mesopore structure from a disordered wormlike structure to a hexagonally arranged structure was observed by X-ray diffraction analysis and was confirmed by transmission electron microscopy. The results of the thermal analysis and functional group identification of mesoporous silica after SPP showed evidence of organic template removal. The surface area calculated using the Brunauer–Emmett–Teller (BET) theory and the mean pore diameter results could be used to evaluate the plasma efficiency, demonstrating that this method does not affect the pore size in the case of discharge in a solution of pH 3 compared with the results of thermal calcination. Hence, SPP was proved to be highly efficient for organic template removal, exhibiting short consumption time and less contamination.