Basina Georgia, Khurshid Hafsa, Tzitzios Nikolaos, Hadjipanayis George, Tzitzios Vasileios
Institute of Nanoscience and Nanotechnology, NCSR Demokritos, 15310 Athens, Greece.
Department of Chemical Engineering, Khalifa University, Abu Dhabi P.O. Box 127788, United Arab Emirates.
Nanomaterials (Basel). 2021 Apr 28;11(5):1141. doi: 10.3390/nano11051141.
Fe-based colloids with a core/shell structure consisting of metallic iron and iron oxide were synthesized by a facile hot injection reaction of iron pentacarbonyl in a multi-surfactant mixture. The size of the colloidal particles was affected by the reaction temperature and the results demonstrated that their stability against complete oxidation related to their size. The crystal structure and the morphology were identified by powder X-ray diffraction and transmission electron microscopy, while the magnetic properties were studied at room temperature with a vibrating sample magnetometer. The injection temperature plays a very crucial role and higher temperatures enhance the stability and the resistance against oxidation. For the case of injection at 315 °C, the nanoparticles had around a 10 nm mean diameter and revealed 132 emu/g. Remarkably, a stable dispersion was created due to the colloids' surface functionalization in a nonpolar solvent.
通过在多表面活性剂混合物中对五羰基铁进行简便的热注射反应，合成了具有由金属铁和氧化铁组成的核/壳结构的铁基胶体。胶体颗粒的尺寸受反应温度影响，结果表明它们对完全氧化的稳定性与其尺寸有关。通过粉末X射线衍射和透射电子显微镜确定晶体结构和形态，同时在室温下用振动样品磁力计研究磁性。注射温度起着非常关键的作用，较高的温度可提高稳定性和抗氧化性。对于在315℃注射的情况，纳米颗粒的平均直径约为10nm，磁矩为132emu/g。值得注意的是，由于胶体在非极性溶剂中的表面功能化，形成了稳定的分散体。
