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OALib Journal期刊
ISSN: 2333-9721
费用：99美元
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表面活性剂结纳米mcm-41分子筛分散性的影响
Keywords: 无机非金属材料,纳米mcm-41分子筛,单分散
Abstract:
？采用聚乙二醇为分散剂,十六烷基三甲基溴化铵为模板剂,正硅酸乙酯为硅源,在室温碱性条件下合成了粒径为40$\sim$60nm的单分散纳米球形mcm--41分子筛.利用xrd、tem和n$_{2}$吸附脱附等手段研究了聚乙二醇用量对纳米球形mcm--41的分散性和介孔结构的影响.结果表明,表面活性剂peg的加入,可以明显改善纳米颗粒的分散性并且对颗粒形貌影响不大;表面活性剂peg的加入,样品的六方结构有序性和孔尺寸发生变化.peg量在1\%$\sim$20\%范围内,样品仍具有较高的六方孔道有序性;peg量过大(60\%)有序性明显下降.随着peg加入量的增加,纳米mcm--41的晶面间距增大,孔尺寸增大.适量的聚乙二醇可以得到有序性好、比表面积大、孔径均一和孔隙率大的单分散纳米球形mcm--41分子筛.
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