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首页> 外文期刊>Applied Surface Science >A Fourier Transform Infrared (ftir) And Thermogravimetric Analysis (tga) Study Of Oleate Adsorbed On Magnetite Nano-particle Surface
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A Fourier Transform Infrared (ftir) And Thermogravimetric Analysis (tga) Study Of Oleate Adsorbed On Magnetite Nano-particle Surface

机译：磁铁矿纳米颗粒表面吸附油酸盐的傅里叶变换红外（ftir）和热重分析（tga）研究

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摘要

Magnetite nano-particles were coated with sodium oleate and the spectral behaviour of the coating layer was studied by FTIR spectroscopy after the particles had been heated in air and argon. Magnetite was synthesized by controlled co-precipitation and subsequently coated with sodium oleate. Thermal analysis in combination with mass spectroscopy was carried out to support the FTIR spectroscopic interpretations, but also to monitor the decomposition and surface reaction of oleate adsorbed on the magnetite surface. It was deduced from FTIR and TGA results that the oleate molecules are bonded to iron atoms by a bidentate mononuclear complex and form essentially a single layer with a distance between oleate molecules of ～36 A~2. It was shown by IR as well as Raman spectroscopy that oleic acid, when heated in air, undergoes decomposition implying that new carbon-oxygen bonds are formed. Heating the iron oxide-oleate system in air also implies oxidation of the double bond at the C:9 position of the alkyl chain and formation of intermediate oxygen-rich molecules. An enthalpy change of △H = 49.86 J/g was obtained for oleate desorption/decomposition at ～350 ℃ under argon atmosphere and a carbonaceous graphitic species resulted from this decomposition.
机译：用油酸钠涂覆磁铁矿纳米颗粒，并在空气和氩气中加热后，通过FTIR光谱研究涂层的光谱行为。通过控制共沉淀合成磁铁矿，然后用油酸钠包被。结合质谱进行了热分析，以支持FTIR光谱解释，而且还监测吸附在磁铁矿表面的油酸盐的分解和表面反应。从FTIR和TGA结果推论出，油酸酯分子通过双齿单核络合物与铁原子键合，并形成单层，油酸酯分子之间的距离约为〜36 A〜2。红外和拉曼光谱表明，油酸在空气中加热时会发生分解，这意味着会形成新的碳-氧键。在空气中加热氧化铁-油酸酯系统也意味着在烷基链C：9位置的双键氧化，并形成中间富氧分子。氩气下〜350℃时油酸盐的解吸/分解，焓变为△H = 49.86 J / g，分解产生碳质石墨。

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