Physical and Structural Characteristics of Gel-derived Glasses Prepared via Different Drying Procedures

IF 16.4 1区化学 Q1 CHEMISTRY, MULTIDISCIPLINARY

Accounts of Chemical Research Pub Date : 2021-12-10 DOI:10.22068/IJMSE.2297

S. Ahmadi, B. E. Yekta, H. Sarpoolaky, A. Aghaei

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引用次数: 2

Abstract

The monolithic gels were prepared through different drying procedures including super critical, infrared wave lengths and traditional drying methods. Dense and transparent glasses with chemical composition of 66SiO2-18B2O3-7Al2O3-6K2O -3BaO (in wt.%) were obtained after controlled heat treatment of the dried porous xerogels at 950°C for 2 h in air atmosphere. The chemical bonding as well as different properties of the prepared gels and the relevant glasses were investigated by means of Fourier transform infrared spectroscopy (FTIR), Brunauer-Emmitt-Teller (BET) and UV-Vis spectrometer. The results indicates that different drying conditions affect the average pore size and the total pore volume of the studied gels. The mean pore size was found to be 8.7, 2.4 and 3.2 nm for super critical, IR radiation and slow drying in air respectively. The glass network structure was significantly changed by heat treatment temperature such that the B-O-Si bonds were formed only after 450°C. It was found that the gel dried under super critical condition was unable to reach to its full density under the sintering conditions adopted in this study.

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不同干燥方法制备凝胶衍生玻璃的物理和结构特性

通过超临界、红外波长和传统干燥方法等不同的干燥程序制备了单片凝胶。干燥的多孔干凝胶在950°C下在空气气氛中控制热处理2小时后，获得了化学成分为66SiO2-18B2O3-7Al2O3-6K2O-3BaO（wt.%）的致密透明玻璃。利用傅立叶变换红外光谱（FTIR）、Brunauer-Emmett-Teller（BET）和UV-Vis光谱仪研究了所制备的凝胶和相关玻璃的化学键合以及不同性质。结果表明，不同的干燥条件会影响所研究凝胶的平均孔径和总孔体积。超临界、红外辐射和在空气中缓慢干燥的平均孔径分别为8.7、2.4和3.2nm。热处理温度显著改变了玻璃网络结构，使得B-O-Si键仅在450°C后形成。研究发现，在超临界条件下干燥的凝胶在本研究采用的烧结条件下无法达到其全密度。

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来源期刊

Accounts of Chemical Research 化学-化学综合

CiteScore

31.40

自引率

1.10%

发文量

312

审稿时长

2 months

期刊介绍： Accounts of Chemical Research presents short, concise and critical articles offering easy-to-read overviews of basic research and applications in all areas of chemistry and biochemistry. These short reviews focus on research from the author’s own laboratory and are designed to teach the reader about a research project. In addition, Accounts of Chemical Research publishes commentaries that give an informed opinion on a current research problem. Special Issues online are devoted to a single topic of unusual activity and significance. Accounts of Chemical Research replaces the traditional article abstract with an article "Conspectus." These entries synopsize the research affording the reader a closer look at the content and significance of an article. Through this provision of a more detailed description of the article contents, the Conspectus enhances the article's discoverability by search engines and the exposure for the research.