Zambzickaite Greta, Talaikis Martynas, Dobilas Jorunas, Stankevic Voitech, Drabavicius Audrius, Niaura Gediminas, Mikoliunaite Lina
Department of Organic Chemistry, Center for Physical Sciences and Technology (FTMC), Sauletekio al. 3, 10257 Vilnius, Lithuania.
Department of Functional Materials and Electronics, Center for Physical Sciences and Technology (FTMC), Sauletekio al. 3, 10257 Vilnius, Lithuania.
Materials (Basel). 2022 Jun 5;15(11):4008. doi: 10.3390/ma15114008.
The synthesis of magnetic particles triggers the interest of many scientists due to their relevant properties and wide range of applications in the catalysis, nanomedicine, biosensing and magnetic separation fields. A fast synthesis of iron oxide magnetic particles using an eco-friendly and facile microwave-assisted solvothermal method is presented in this study. Submicron FeO spheres were prepared using FeCl as an iron source, ethylene glycol as a solvent and reductor and sodium acetate as a precipitating and nucleating agent. The influence of the presence of polyethylene glycol as an additional reductor and heat absorbent was also evaluated. We reduce the synthesis time to 1 min by increasing the reaction temperature using the microwave-assisted solvothermal synthesis method under pressure or by adding PEG at lower temperatures. The obtained magnetite spheres are 200-300 nm in size and are composed of 10-30 nm sized crystallites. The synthesized particles were investigated using the XRD, TGA, pulsed-field magnetometry, Raman and FTIR methods. It was determined that adding PEG results in spheres with mixed magnetite and maghemite compositions, and the synthesis time increases the size of the crystallites. The presented results provide insights into the microwave-assisted solvothermal synthesis method and ensure a fast route to obtaining spherical magnetic particles composed of different sized nanocrystallites.
磁性颗粒的合成因其相关特性以及在催化、纳米医学、生物传感和磁分离领域的广泛应用而引发了众多科学家的兴趣。本研究介绍了一种采用环保且简便的微波辅助溶剂热法快速合成氧化铁磁性颗粒的方法。使用FeCl作为铁源、乙二醇作为溶剂和还原剂以及醋酸钠作为沉淀和成核剂制备了亚微米级FeO球。还评估了聚乙二醇作为额外还原剂和吸热剂的存在所产生的影响。通过在压力下使用微波辅助溶剂热合成法提高反应温度或在较低温度下添加PEG，我们将合成时间缩短至1分钟。所获得的磁铁矿球尺寸为200 - 300 nm，由尺寸为10 - 30 nm的微晶组成。使用XRD、TGA、脉冲场磁强计、拉曼和FTIR方法对合成的颗粒进行了研究。确定添加PEG会导致形成具有磁铁矿和磁赤铁矿混合成分的球，并且合成时间会增加微晶的尺寸。所呈现的结果为微波辅助溶剂热合成法提供了见解，并确保了一条快速获得由不同尺寸纳米微晶组成的球形磁性颗粒的途径。
