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Synthesis and characterization of iron based hybrid nanoparticles with polymer surfactant-Pluronic(R) F127.

机译：具有聚合物表面活性剂-P127的铁基杂化纳米颗粒的合成和表征。

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Nanotechnology is one of the current major research fields. Due to numerous applications, magnetic nanoparticles have become one of the most interesting areas of research. In a previous study Mn-Fe mixed oxide nanoparticles were synthesized by irradiating the solution of Mn and Fe carbonyls with high intensity ultrasound. They exhibited crystal structure and magnetism which changed with the Mn:Fe ratio. However, since these materials were amorphous, they had to be annealed and this led to aggregation decreasing the surface:volume ratio. In order to prevent this sintering, we have now adopted a wet chemical method in which organometals were decomposed by heating to form metals or metal oxides. Micelles of the polymer PluronicRTM, were used for dimensional confinement, leading to the control of the particle size. Pluronic RTM stabilizes the surface of the particles and the heating crystallizes the particles, so that the resulting products are non-aggregated crystals. By using this synthetic method, we have accomplished the following objectives. (1) Iron/iron oxide particles are obtained from thermo decomposition of Fe(CO)5 solution. The size of the particles is controlled by adjusting the concentration of surfactant. The particles size changed from 5.6 to 22.3 nm from high to low concentration of PluronicRTM. (2) Mn-Fe or Co-Fe mixed oxide particles are obtained by the thermal decomposition of Mn2(CO)10 and Fe(CO)5 or Co2(CO)8 and Fe(CO)5 solutions. We observed crystal structure and magnetism transformations when the Mn:Fe or Co:Fe ratio was increased. (3) Heterostructure core/shell nanoparticles were obtained by using Fe nanoparticles to catalyze the decomposition of chromium hexacarbonyl. The resulting particles have a Cr core and a gamma-Fe2O 3 shell.; The materials were characterized by synchrotron power XRD for their crystal structure, SQUID and Mossbauer spectra for their magnetic properties, and TEM and HRTEM for their morphology.
机译：纳米技术是当前的主要研究领域之一。由于应用众多，磁性纳米粒子已成为最有趣的研究领域之一。在先前的研究中，通过用高强度超声辐照Mn和Fe羰基溶液来合成Mn-Fe混合氧化物纳米颗粒。它们表现出晶体结构和磁性随Mn：Fe比而变化。但是，由于这些材料是非晶态的，因此必须对其进行退火，从而导致聚集，从而降低了表面体积比。为了防止这种烧结，我们现在采用湿化学方法，其中通过加热将有机金属分解以形成金属或金属氧化物。聚合物PluronicRTM的胶束用于尺寸限制，从而控制了粒径。 Pluronic RTM稳定了颗粒的表面，加热使颗粒结晶，因此所得产品为非聚集晶体。通过使用这种合成方法，我们实现了以下目标。 （1）铁/氧化铁颗粒是通过Fe（CO）5溶液的热分解获得的。通过调节表面活性剂的浓度来控制颗粒的尺寸。从高浓度到低浓度的PluronicRTM，粒径从5.6纳米变为22.3纳米。 （2）通过热分解Mn 2（CO）10和Fe（CO）5或Co 2（CO）8和Fe（CO）5溶液获得Mn-Fe或Co-Fe混合氧化物颗粒。当增加Mn：Fe或Co：Fe比率时，我们观察到晶体结构和磁性转变。 （3）通过使用Fe纳米颗粒催化六羰基铬的分解获得异质结构的核/壳纳米颗粒。所得颗粒具有Cr核和γ-Fe2 O 3壳。这些材料的特征在于其晶体结构的同步加速器功率XRD，其磁性能的SQUID和Mossbauer光谱，以及其形态的TEM和HRTEM。

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