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

作者：Ding Yi; Yin Guangfu^*; Liao Xiaoming; Huang Zhongbin; Chen Xianchun; Yao Yadong

来源：Materials Letters, 2012, 75: 45-47.

DOI：10.1016/j.matlet.2012.01.091

• Mesoporous materials
• SBA-15
• Rods
• Modulus
• Sodium silicate

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.

• 出版日期2012-5-15
• 单位四川大学