Journal
COLLOIDS AND SURFACES A-PHYSICOCHEMICAL AND ENGINEERING ASPECTS
Volume 346, Issue 1-3, Pages 229-236Publisher
ELSEVIER
DOI: 10.1016/j.colsurfa.2009.06.021
Keywords
Silica nanoparticles; Hollow spheres; Ionic liquid; Microemulsion template
Categories
Funding
- National Natural Science Foundation of China [20773081, 20873074]
- National Basic Research Program [2007CB808004, 2009CB930101]
- Laboratory of Organic Optoelectronic Functional Materials and Molecular Engineering, TIPC, CAS
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Silica products with two different morphologies were synthesized using nonaqueous ionic liquid microemulsion droplets as templates. The morphologies of the obtained products were characterized by both transmission electron microscopy (TEM) and scanning electron microscopy (SEM). By adjusting the reaction conditions, ellipsoidal nanoparticles were formed under acidic conditions, while hollow silica spheres were obtained under alkaline conditions. It is demonstrated that the size distribution of hollow silica spheres was narrower than that of the ellipsoidal nanoparticles. The various vibration modes of different functional groups in the silica materials were revealed by Fourier transform infrared (FTIR) spectroscopy. The two samples were both shown to be amorphous, not crystalline by X-ray diffraction (XRD). A simple diagram of the formation process including the hydrolysis and condensation reactions is given. Furthermore, a probable mechanism for the formation of silica materials under acidic or alkaline conditions is presented, which may be helpful for better understanding the different silica materials obtained under different conditions. (C) 2009 Elsevier B.V. All rights reserved.
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