聚合物
材料科学
高岭石
氧化铁
赤铁矿
氢氧化物
煅烧
穆斯堡尔谱学
化学工程
铁磁性
冶金
粉煤灰
复合材料
催化作用
有机化学
结晶学
化学
物理
量子力学
工程类
作者
Kelly Cristiane Gomes,Gabriel S.T. Lima,Sandro Marden Torres,Sílvio de Barros,Igor F. Vasconcelos,Normando Perazzo Barbosa
出处
期刊:Materials Science Forum
日期:2010-03-01
卷期号:643: 131-138
被引量:55
标识
DOI:10.4028/www.scientific.net/msf.643.131
摘要
Geompolymers and their engineering applications have attracted significant attention of the scientific community. This is due to properties such as good thermal stability and high resistance to aggressive environments. Most studies on this subject are based on traditional precursor materials such as calcined kaolinite clay (metakaolinite) and fly ash. The iron content is significant, reaching around 10% in metakaolinite, for instance. The role of iron in geopolymers still lacks systematic investigation. This can be attributed to the limitations presenting nuclear magnetic resonance (NMR) spectroscopy, which is a widely used technique to study geopolymers structure. Ferromagnetic elements such as iron, which is often present in some precursors, affect the magnetic response of the material, compromising the proper analysis of its structure by NMR results. Iron content in some industrial residues may be several times higher as it is often found in metakaolinite. This work presents x-ray diffraction, infrared and Mössbauer spectroscopy studies on the distribution of iron species in iron oxide/hydroxide-rich precursor, which was used to synthesized geopolymers.
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