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首页> 外文期刊>Ultrasonics sonochemistry >Ultrasonic cavitation induced water in vegetable oil emulsion droplets - A simple and easy technique to synthesize manganese zinc ferrite nanocrystals with improved magnetization
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Ultrasonic cavitation induced water in vegetable oil emulsion droplets - A simple and easy technique to synthesize manganese zinc ferrite nanocrystals with improved magnetization

机译：超声空化在植物油乳液液滴中诱导水-一种简便易行的技术，可改善磁化强度，合成锰锌铁氧体纳米晶体

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In the present investigation, synthesis of manganese zinc ferrite (Mn _(0.5)Zn _(0.5)Fe _2O _4) nanoparticles with narrow size distribution have been prepared using ultrasound assisted emulsion (consisting of rapeseed oil as an oil phase and aqueous solution of Mn ~(2+), Zn ~(2+) and Fe ~(2+) acetates) and evaporation processes. The as-prepared ferrite was nanocrystalline. In order to remove the small amount of oil present on the surface of the ferrite, it was subjected to heat treatment at 300°C for 3 h. Both the as-prepared and heat treated ferrites have been characterized by X-ray diffraction (XRD), infrared spectroscopy (IR), TGA/DTA, transmission electron microscopy (TEM) and energy dispersion X-ray spectroscopy (EDS) techniques. As-prepared ferrite is of 20 nm, whereas the heat treated ferrite shows the size of 33 nm. In addition, magnetic properties of the as-prepared as well as the heat treated ferrites have also been carried out and the results of which show that the spontaneous magnetization (σ _s) of the heat treated sample (24.1 emu/g) is significantly higher than that of the as-synthesized sample (1.81 emu/g). The key features of this method are avoiding (a) the cumbersome conditions that exist in the conventional methods; (b) usage of necessary additive components (stabilizers or surfactants, precipitants) and (c) calcination requirements. In addition, rapeseed oil as an oil phase has been used for the first time, replacing the toxic and troublesome organic nonpolar solvents. As a whole, this simple straightforward sonochemical approach results in more phase pure system with improved magnetization.
机译：在本研究中，使用超声辅助乳液（由菜籽油作为油相和水溶液）制备了具有窄尺寸分布的锰锌铁氧体（Mn _（0.5）Zn _（0.5）Fe _2O _4）纳米粒子的合成。 Mn〜（2 +），Zn〜（2+）和Fe〜（2+）乙酸盐）和蒸发过程。所制备的铁氧体是纳米晶体。为了除去存在于铁素体表面上的少量油，将其在300°C热处理3小时。制备的铁氧体和热处理的铁氧体均已通过X射线衍射（XRD），红外光谱（IR），TGA / DTA，透射电子显微镜（TEM）和能量色散X射线光谱（EDS）技术进行了表征。制备后的铁氧体为20 nm，而经过热处理的铁氧体的尺寸为33 nm。此外，还对制备的铁氧体和热处理的铁氧体进行了磁性能测试，结果表明，热处理后样品的自发磁化强度（σ_s）（24.1 emu / g）明显更高。比合成后的样品（1.81 emu / g）高。该方法的关键特征是避免（a）常规方法中存在的繁琐条件; （b）使用必要的添加剂组分（稳定剂或表面活性剂，沉淀剂）和（c）煅烧要求。另外，菜籽油作为油相首次被使用，代替了有毒且麻烦的有机非极性溶剂。总体而言，这种简单直接的声波化学方法可产生具有改善的磁化强度的更多纯相系统。

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