Key role of sodium silicate modulus in synthesis of mesoporous silica SBA-15 rods with controllable lengths and diameters

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• 作者：Yi Ding ; Guangfu Yin ; ^{nic0700@scu.edu.cn} ; Xiaoming Liao ; Zhongbin Huang ; Xianchun Chen ; Yadong Yao
• 关键词：Mesoporous materials ; SBA-15 ; Rods ; Modulus ; Sodium silicate
• 刊名：Materials Letters
• 出版年：2012
• 期刊代码：59_0167577x
• 类别：ms
• 出版时间：15 May, 2012
• 卷：75
• 期：Complete
• 页码：45-47
• 文件大小：391 K

摘要

Monodispersed and highly ordered mesoporous silica SBA-15 rods with controllable size were synthesized by using triblock copolymer Pluronic P123 (EO₂₀-PO₇₀-EO₂₀) as a structure-directing agent and sodium silicate as silica source without any additives. The rods' length (800-1200 nm) and diameter (300-500 nm) were tuned by varying the modulus (molar ratio SiO₂/Na₂O) of sodium silicate. The effect of the modulus on the structure and morphology of mesoporous silica SBA-15 was investigated. The size and structural order of the products were found to be greatly affected by modulus. The results suggested that with the increase of modulus, the length of rods decreased and the diameter increased. Moreover, a higher modulus favored the formation of higher ordered SBA-15 rods.