Levish Alexander, Winterer Markus
Nanoparticle Process Technology, Department of Mechanical and Process Engineering, University of Duisburg-Essen, Lotharstr. 1, 47057, Duisburg, Germany.
Sci Rep. 2022 Sep 12;12(1):15291. doi: 10.1038/s41598-022-19276-4.
A novel chemical vapor synthesis reactor design is used to control the pore-particle mesostructure and investigate the pore formation mechanism through the variation of residence time in oxygen. This enables the exploitation of the Kirkendall effect at the nanoscale to generate ultrasmall pores in small nanocrystalline iron oxide particles. Detailed structural characterization and quantitative data analysis of complementary high resolution transmission electron microscopy images, X-ray diffractograms, nitrogen sorption isotherms and X-ray absorption spectra provide a consistent comprehensive picture of the hollow nanoparticles from the local to the microstructure. The pore formation mechanism seems to play a key role for β-FeO polymorph formation.
一种新型化学气相合成反应器设计用于控制孔-颗粒介观结构，并通过改变在氧气中的停留时间来研究孔形成机制。这使得能够在纳米尺度利用柯肯达尔效应在小的纳米晶氧化铁颗粒中产生超小孔。对互补的高分辨率透射电子显微镜图像、X射线衍射图、氮吸附等温线和X射线吸收光谱进行详细的结构表征和定量数据分析，提供了从局部到微观结构的中空纳米颗粒的一致综合图像。孔形成机制似乎对β-FeO多晶型的形成起关键作用。
