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

4区材料科学 Q2 Engineering

Advances in Materials Science and Engineering Pub Date : 2007-10-18 DOI:10.1155/2007/23018

J. R. Martínez, G. Martínez-Castañón, G. Ortega-Zarzosa, J. A. Cruz-Mendoza, S. Palomares-Sánchez, F. Ruiz

引用次数: 5

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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叶绿素掺入对热处理二氧化硅干凝胶结构的影响

含有叶绿素聚集体分散在无定形二氧化硅中的复合材料由于其光学吸引特性而引起了人们的兴趣。采用溶胶-凝胶法制备了添加叶绿素的硅粉，对其进行了x射线衍射、红外光谱和差温分析。采用乙醇/水/正硅酸乙酯(TEOS)的摩尔比为4:11.6:1制备二氧化硅干凝胶样品，并加载冷冻菠菜叶提取物。研究了粉末的二氧化硅干凝胶微观结构与退火温度的关系。我们在我们的样品中发现，在400°C后，由于叶绿素分解促进光系统变性，玻璃基体部分结晶形成了黄玉石和方石石相，并形成了淬灭中心或不发荧光的聚集体。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

Advances in Materials Science and Engineering Materials Science-General Materials Science

CiteScore

3.30

自引率

0.00%

发文量

审稿时长

4-8 weeks

期刊介绍： Advances in Materials Science and Engineering is a broad scope journal that publishes articles in all areas of materials science and engineering including, but not limited to: -Chemistry and fundamental properties of matter -Material synthesis, fabrication, manufacture, and processing -Magnetic, electrical, thermal, and optical properties of materials -Strength, durability, and mechanical behaviour of materials -Consideration of materials in structural design, modelling, and engineering -Green and renewable materials, and consideration of materials’ life cycles -Materials in specialist applications (such as medicine, energy, aerospace, and nanotechnology)