Formation Mechanisms of Iron Oxide Nanopartides in Different Nonaqueous Media
Formation Mechanisms of Iron Oxide Nanopartides in Different Nonaqueous Media
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DOI：
10.1021/cg201563h
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发表时间：
2012-03-01
影响因子：
3.8
通讯作者：
Garnweitner, Georg
中科院分区：
文献类型：
--
作者：
Grabs, Ilka-Marina;Bradtmoeller, Christian;Garnweitner, Georg
研究了以苯甲醇和三甘醇为非水溶剂的溶剂热合成法制备氧化铁纳米粒子的过程。此外，进行了从实验室规模高压釜（45 mL体积）到1.5 L反应器的合成放大。研究了两种反应容器以及两种溶剂的粒度和结晶度、磁性和所产生颗粒的稳定性的差异。一个两步机制被确定，与快速的颗粒形成步骤和一个独特的，较慢的结晶步骤导致在磁化强度的强烈增加。确定了两种反应介质之间的颗粒形成的强烈差异。通过在不同极性和非极性溶剂中的沉降时间的定性比较来筛选所产生的颗粒对团聚的稳定性。
The formation of iron oxide nanoparticles in a solvothermal synthesis with two different nonaqueous solvents, benzyl alcohol (BA) and triethylene glycol (TEG), was studied. Additionally, a scale-up of the synthesis from lab scale autoclaves (45 mL volume) to a 1.5 L reactor was performed. The differences in both reaction vessels as well as for both solvents were investigated regarding the particle size and crystallinity, the magnetic properties, and the stability of the produced particles. A two-step mechanism was identified, with a fast particle formation step and a distinct, slower crystallization step resulting in a strong increase in magnetization. Strong differences in the particle formation between the two reaction media were identified. The stability of the produced particles against agglomeration was screened by a qualitative comparison of sedimentation time in different polar and nonpolar solvents.