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- W2003154518 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/<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=E1><mml:mrow><mml:msub><mml:mtext>H</mml:mtext><mml:mn>2</mml:mn></mml:msub><mml:mtext>O</mml:mtext></mml:mrow></mml:math>/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<mml:math xmlns:mml=http://www.w3.org/1998/Math/MathML id=E2><mml:mrow><mml:msup><mml:mrow><mml:mn>400</mml:mn></mml:mrow><mml:mo>∘</mml:mo></mml:msup><mml:mtext>C</mml:mtext></mml:mrow></mml:math>." @default.
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- W2003154518 date "2007-01-01" @default.
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- W2003154518 title "Structural Effects of Heat-Treated Silica Xerogel Induced by Incorporation of Chlorophyll Species" @default.
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- W2003154518 doi "https://doi.org/10.1155/2007/23018" @default.
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