Structural Effects of Heat-Treated Silica Xerogel Induced by Incorporation of Chlorophyll Species

Martínez, J. R.; Martínez-Castañón, G.; Ortega-Zarzosa, G.; de la Cruz-Mendoza, J. A.; Palomares-Sánchez, S. A.; Ruiz, Facundo

doi:https://doi.org/10.1155/2007/23018

Advances in Materials Science and Engineering

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Research Letter | Open Access

Volume 2007 | Article ID 023018 | https://doi.org/10.1155/2007/23018

Structural Effects of Heat-Treated Silica Xerogel Induced by Incorporation of Chlorophyll Species

J. R. Martínez,^1,2G. Martínez-Castañón,¹G. Ortega-Zarzosa,¹J. A. de la Cruz-Mendoza,¹S. A. Palomares-Sánchez,¹and Facundo Ruiz¹

Academic Editor: G. Q. Lu

Received29 Aug 2007

Accepted05 Oct 2007

Published18 Oct 2007

Abstract

Composites containing chlorophyll aggregates dispersed in amorphous silica are of interest because of their optical attractive properties. The silica powders added with chlorophyll species, prepared by the sol-gel method, were studied using X-ray diffraction, IR spectroscopy and differential temperature analysis. Silica xerogel samples were prepared using an ethanol/H2O/TEOS molar ratio of 4:11.6:1 and loaded with extracts from frozen spinach leaves. The silica xerogel microstructure of the powders was studied as a function of the annealing temperature. We found in our samples partial crystallization of the glass matrix in form of tridymite and cristobalite phases and quenching centers or nonfluorescing aggregates due to denaturation of photosystem promoted by chlorophyll decomposition after 400∘C.

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Copyright

Copyright © 2007 J. R. Martínez et al. This is an open access article distributed under the Creative Commons Attribution License, which permits unrestricted use, distribution, and reproduction in any medium, provided the original work is properly cited.

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