Journal
JOURNAL OF NANOPARTICLE RESEARCH
Volume 15, Issue 3, Pages -Publisher
SPRINGER
DOI: 10.1007/s11051-013-1501-0
Keywords
Nanorod; Mesoporous silica; Modified Stober media; Mechanism; Dye adsorption
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Funding
- National Natural Science Foundation of China [50972052]
- Promotive Research Fund for Excellent Young and Middle-aged Scientists of Shandong Province [BS2009CL001]
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The morphology and textural characteristics of mesoporous silicas formed in the modified Stober media with reactant ratios of 1TEOS:19.9E-tOH:xH(2)O:10.4NH(3)center dot H2O: 0.3CTAB (x = 0 similar to 2,973) have been investigated by SEM, small angle XRD, and N-2-sorption measurements. The results show that when the reaction mixture is simply diluted with water, a series of morphologically different silicas are formed in the order of: microspheres -> irregular particles -> rectangular rods -> round nanorods. The microspheres are formed when the water ratio ranges from 0 to 124, whereas nanorods are dominant in the products when the water ratios are larger than 372. It is demonstrated that the size of the nanorods decreases with the increase of water. Except the sample synthesized without water, all the other samples are mesoporous. The mesopores in the nanorods become larger, but more and more disordered with increasing the amounts of water. Based on the experimental results, the mechanism of the morphological transformations is proposed. Finally, the dye adsorption behavior of the nanospheres and the nanorods was tested and compared.
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