Szczerba Wojciech, Costo Rocio, Veintemillas-Verdaguer Sabino, Morales Maria Del Puerto, Thünemann Andreas F
Federal Institute for Materials Research and Testing (BAM), Unter den Eichen 87, 12205 Berlin, Germany; Academic Centre for Materials and Nanotechnology, AGH University of Science and Technology, Aleja Mickiewicza 30, 30-059 Kraków, Poland.
Instituto de Ciencia de Materiales de Madrid, ICMM/CSIC , Sor Juana Ines de la Cruz 3, 28049 Madrid, Spain.
J Appl Crystallogr. 2017 Mar 14;50(Pt 2):481-488. doi: 10.1107/S1600576717002370. eCollection 2017 Apr 1.
This article reports on the characterization of four superparamagnetic iron oxide nanoparticles stabilized with dimercaptosuccinic acid, which are suitable candidates for reference materials for magnetic properties. Particles p and p are single-core particles, while p and p are multi-core particles. Small-angle X-ray scattering analysis reveals a lognormal type of size distribution for the iron oxide cores of the particles. Their mean radii are 6.9 nm (p), 10.6 nm (p), 5.5 nm (p) and 4.1 nm (p), with narrow relative distribution widths of 0.08, 0.13, 0.08 and 0.12. The cores are arranged as a clustered network in the form of dense mass fractals with a fractal dimension of 2.9 in the multi-core particles p and p, but the cores are well separated from each other by a protecting organic shell. The radii of gyration of the mass fractals are 48 and 44 nm, and each network contains 117 and 186 primary particles, respectively. The radius distributions of the primary particle were confirmed with transmission electron microscopy. All particles contain purely maghemite, as shown by X-ray absorption fine structure spectroscopy.
本文报道了四种用二巯基琥珀酸稳定的超顺磁性氧化铁纳米颗粒的表征，它们是磁性参考材料的合适候选物。颗粒p和p是单核颗粒，而p和p是多核颗粒。小角X射线散射分析表明，颗粒的氧化铁核的尺寸分布呈对数正态类型。它们的平均半径分别为6.9 nm（p）、10.6 nm（p）、5.5 nm（p）和4.1 nm（p），相对分布宽度较窄，分别为0.08、0.13、0.08和0.12。在多核颗粒p和p中，核以密集质量分形的形式排列成簇状网络，分形维数为2.9，但核通过保护性有机壳层彼此很好地分离。质量分形的回转半径分别为48和44 nm，每个网络分别包含117和186个初级颗粒。通过透射电子显微镜确认了初级颗粒的半径分布。如X射线吸收精细结构光谱所示，所有颗粒均只含有磁赤铁矿。
