Open AccessStructural Effects of Heat-Treated Silica Xerogel Induced by Incorporation of Chlorophyll Species
Author(s) -
J. R. Martı́nez,
Gabriel Alejandro Martínez-Castañón,
G. OrtegaZarzosa,
J. A. de la Cruz-Mendoza,
S.A. Palomares-Sánchez,
Facundo Ruíz
Publication year - 2007
Publication title -
research letters in materials science
Language(s) - English
Resource type - Journals
eISSN - 1687-6830
pISSN - 1687-6822
DOI - 10.1155/2007/23018
Subject(s) - tridymite , materials science , crystallization , amorphous solid , analytical chemistry (journal) , cristobalite , chemistry , chromatography , crystallography , organic chemistry , composite material , quartz
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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