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Highly transparent silica monoliths embedded with high concentration oxide nanoparticles

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Abstract

Silica monoliths embedded with high concentration of γ-Fe2O3 or TiO2 nanoparticles were prepared by a sol–gel procedure designed according to the inherent properties of oxide colloids. In the first step, highly dispersible oxide nanoparticles were produced using an in situ modification sol–gel strategy. Then, these particles were re-dispersed in silicon alkoxide-containing solution to form a stable colloidal solution. The hydrolysis and condensation reactions of alkoxide were catalyzed by an organic base (morpholine). Due to the large molecule size of morpholine, the electric double layer on the surface of colloidal particles was not compressed by the ionized morpholine molecules. The colloidal solution thus remained stable during the gelation process. Through this procedure, oxide nanoparticles could be immobilized homogeneously in the pores of a silica matrix, forming highly transparent and crack-free monoliths.

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Acknowledgments

This work is supported by National Natural Science Foundation of China (20971107) and Shandong Provincial Engineering Research Center for Light Hydrocarbon Comprehensive Utilization.

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Authors and Affiliations

  1. Shandong Provincial Engineering Research Center for Light Hydrocarbon Comprehensive Utilization, College of Chemistry and Chemical Engineering, Yantai University, Yantai, 264005, China

    Hongtao Cui, Minmin Wang, Wanzhong Ren, Yan Liu & Yunan Zhao

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  1. Hongtao Cui
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  2. Minmin Wang
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  3. Wanzhong Ren
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  4. Yan Liu
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  5. Yunan Zhao
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Correspondence to Hongtao Cui.

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Cui, H., Wang, M., Ren, W. et al. Highly transparent silica monoliths embedded with high concentration oxide nanoparticles. J Sol-Gel Sci Technol 66, 512–517 (2013). https://doi.org/10.1007/s10971-013-3040-7

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  • DOI: https://doi.org/10.1007/s10971-013-3040-7

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