Saini Apurve, Borchers Julie A, George Sebastian, Maranville Brian B, Krycka Kathryn L, Dura Joseph A, Theis-Bröhl Katharina, Wolff Max
Department for Physics and Astronomy, Uppsala University, Lägerhyddsvägen 1, 752 37 Uppsala, Sweden.
NIST Center for Neutron Research, 100 Bureau Drive, Gaithersburg, 20899-6102, USA.
Soft Matter. 2020 Aug 26;16(33):7676-7684. doi: 10.1039/d0sm01088j.
We reveal the assembly of magnetite nanoparticles of sizes 5 nm, 15 nm and 25 nm from dilute water-based ferrofluids onto an amorphous magnetic template with out-of-plane anisotropy. From neutron reflectometry experiments we extract density profiles and show that the particles self-assemble into layers at the magnetic surface. The layers are extremely stable against cleaning and rinsing of the substrate. The density of the layers is determined by and increases with the remanent magnetic moment of the particles.
我们揭示了尺寸为5纳米、15纳米和25纳米的磁铁矿纳米颗粒从稀水基铁磁流体在具有面外各向异性的非晶磁性模板上的组装过程。通过中子反射测量实验，我们提取了密度分布，并表明颗粒在磁性表面自组装成层。这些层在对基底进行清洗和冲洗时极其稳定。层的密度由颗粒的剩余磁矩决定，并随其增加。
