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Iron makes up about 6.3% of the Earth's crust; however it is never found in pure form, but instead, combined with other elements, especially oxygen, yielding iron oxides. These iron compounds possess distinct properties such as coloration, resulting from electron transitions between the d (t2gand eg) orbitals. These colors include yellows and reds, which are responsible for soil colors [1,2]. In living organisms, iron oxides are responsible for the activities of many enzymes, and in this way, they can be applied in biomedicine. Synthetic iron oxides are of great importance in many elds. Some oxides are used as catalysts, in redox processes and as pigments [3e8]. They are used to dye paper, rubber, plastics and cement, paint components, varnishes and enamels, because of the range of colors (yellow, brown, red, etc.) that can be obtained [9]. The colors of synthetic iron oxides differ depending on the method and conditions employed [8e16], as for each oxide or oxide hydroxide phase a speci c method is necessary. No reporting was found in the literature regarding the synthesis of different types of iron oxides employing different forced hydrolysis temperatures in order to obtain pigments with different colors. This article presents the identi cation of iron oxide hydroxides synthesized at different temperatures of forced hydrolysis (thermohydrolysis), beginning with inorganic precursors iron (III) chloride hexahydrate (FeCl3•6H2O) and iron (III) nitrate nonahydrate(Fe(NO3)3•9H2O). These syntheses yielded nanoparticles with a slight change in the composition that is responsible for the colors in these oxide hydroxides. The principal properties studied were thermal behavior, size distribution, morphology and chemical composition. The instrumental techniques used for characterization were thermogravimetric analysis, energy dispersive spectroscopy, Raman spectroscopy and X-ray diffractometry. Particle size was determined through dynamic light scattering and X-ray diffractometry. Colors were attributed through electronic spectroscopy. |
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marching4u
铜虫 (初入文坛)
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- 专业: 微量元素地球化学
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铁约占地壳的6.3%，但它从未发现在纯形式，但相反，与其他元素，特别是氧，产生铁氧化物。这些铁化合物具有不同的性质，如显色，与d电子跃迁产生的（t2gand EG）轨道。这些颜色有黄色和红色，这是负责土壤颜色[1,2]。 在生物体中，铁的氧化物是负责许多酶的活性，并以这种方式，他们可以应用于生物医学。合成氧化铁是在许多领域杰出的重要性。一些氧化物为催化剂，在氧化还原过程和颜料[制备]。它们被用来染色纸，橡胶，塑料，水泥，油漆，清漆和磁漆，组件，因为范围的颜色（黄色，棕色，红色，等等），可以得到[ 9 ]。 合成氧化铁的颜色取决于方法和条件[ 8e16 ]，作为每个氧化物或氧化物相的具体方法是必要的。没有报告发现在文献中关于不同类型的铁的氧化物，采用不同的强制水解温度，以获得不同的颜色的颜料的合成。 本文介绍了羟基氧化铁在强制水解不同温度下制备的识别（水解），与无机铁（III）开始氯化（FeCl3•6H2O）和铁（III）水合硝酸（Fe（NO3）3•9H2O）。这些合成了纳米颗粒的组合物，这些氧化物氢氧化物颜色略有变化的责任。研究的主要性能是热行为，粒度分布，形态和化学成分。用于表征仪器技术进行热重分析，能量色散光谱，拉曼光谱和X射线衍射。粒度的确定通过动态光散射、X射线衍射仪。通过电子光谱的颜色。 双语对照 |
2楼2015-09-16 11:22:26