A simple approach to prepare monodisperse mesoporous silica nanospheres with adjustable sizes

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• 作者：Meihua Yu^a ; Liang Zhou^a ; Jun Zhang^a ; Pei Yuan^a ; Peter Thorn^b ; Wenyi Gu^a ; Chengzhong Yu^a ; ^{c.yu@uq.edu.au}
• 关键词：Mesoporous silica ; Monodisperse spheres ; Self-assembly ; Hydrothermal treatment ; Formation mechanism
• 刊名：Journal of Colloid and Interface Science
• 出版年：2012
• 期刊代码：125_00219797
• 类别：ch
• 出版时间：15 June, 2012
• 卷：376
• 期：1
• 页码：67-75
• 文件大小：1798 K

摘要

A new and facile approach has been developed to prepare monodisperse mesoporous silica nanospheres (MMSNs) with controlled particle sizes and pore structures. In our approach, MMSNs were synthesized simply in a sodium acetate solution without adding any other alkali or alcohol additives. MMSNs have a spherical shape and uniform particle sizes, which can be adjusted from 50 to 110 nm by increasing the reaction temperature from 40 to 80 掳C. By performing a subsequent hydrothermal treatment (HT) under basic condition (pH = 鈭?1.5) at 130 掳C, the mesoporous pore volume and surface area can be enhanced, while keeping the mono-dispersion characteristics and the mesopore size almost unchanged. The pore sizes of MMSNs can be adjusted from 2.8 to 4.0 nm under acidic solutions by changing the HT temperature from 100 to 130 掳C. The formation process of MMSNs has been investigated by transmission electron microscopy (TEM) and attenuated total reflection Fourier transform infrared (ATR-FTIR) techniques. A spherical micelle templating mechanism is proposed to explain the formation of MMSNs in our system, which is different from that of traditional highly ordered mesoporous silica nanoparticles (MCM-41).