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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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鐵約占地殼的6.3%，但它從未發(fā)現(xiàn)在純形式，但相反，與其他元素，特別是氧，產(chǎn)生鐵氧化物。這些鐵化合物具有不同的性質(zhì)，如顯色，與d電子躍遷產(chǎn)生的（t2gand EG）軌道。這些顏色有黃色和紅色，這是負責土壤顏色[1,2]。 在生物體中，鐵的氧化物是負責許多酶的活性，并以這種方式，他們可以應(yīng)用于生物醫(yī)學。合成氧化鐵是在許多領(lǐng)域杰出的重要性。一些氧化物為催化劑，在氧化還原過程和顏料[制備]。它們被用來染色紙，橡膠，塑料，水泥，油漆，清漆和磁漆，組件，因為范圍的顏色（黃色，棕色，紅色，等等），可以得到[ 9 ]。 合成氧化鐵的顏色取決于方法和條件[ 8e16 ]，作為每個氧化物或氧化物相的具體方法是必要的。沒有報告發(fā)現(xiàn)在文獻中關(guān)于不同類型的鐵的氧化物，采用不同的強制水解溫度，以獲得不同的顏色的顏料的合成。 本文介紹了羥基氧化鐵在強制水解不同溫度下制備的識別（水解），與無機鐵（III）開始氯化（FeCl3•6H2O）和鐵（III）水合硝酸（Fe（NO3）3•9H2O）。這些合成了納米顆粒的組合物，這些氧化物氫氧化物顏色略有變化的責任。研究的主要性能是熱行為，粒度分布，形態(tài)和化學成分。用于表征儀器技術(shù)進行熱重分析，能量色散光譜，拉曼光譜和X射線衍射。粒度的確定通過動態(tài)光散射、X射線衍射儀。通過電子光譜的顏色。 雙語對照 |
2樓2015-09-16 11:22:26
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