Singh Gurvinder, Chan Henry, Udayabhaskararao T, Gelman Elijah, Peddis Davide, Baskin Artem, Leitus Gregory, Král Petr, Klajn Rafal
Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel.
Faraday Discuss. 2015;181:403-21. doi: 10.1039/c4fd00265b.
Self-assembly of inorganic nanoparticles has been studied extensively for particles having different sizes and compositions. However, relatively little attention has been devoted to how the shape and surface chemistry of magnetic nanoparticles affects their self-assembly properties. Here, we undertook a combined experiment-theory study aimed at better understanding of the self-assembly of cubic magnetite (Fe3O4) particles. We demonstrated that, depending on the experimental parameters, such as the direction of the magnetic field and nanoparticle density, a variety of superstructures can be obtained, including one-dimensional filaments and helices, as well as C-shaped assemblies described here for the first time. Furthermore, we functionalized the surfaces of the magnetic nanocubes with light-sensitive ligands. Using these modified nanoparticles, we were able to achieve orthogonal control of self-assembly using a magnetic field and light.
对于具有不同尺寸和组成的颗粒，无机纳米颗粒的自组装已得到广泛研究。然而，相对较少的注意力被投入到磁性纳米颗粒的形状和表面化学如何影响其自组装性质上。在此，我们进行了一项结合实验与理论的研究，旨在更好地理解立方磁铁矿（Fe3O4）颗粒的自组装。我们证明，根据诸如磁场方向和纳米颗粒密度等实验参数，可以获得多种超结构，包括一维细丝和螺旋结构，以及首次在此描述的C形组装体。此外，我们用光敏配体对磁性纳米立方体的表面进行了功能化。使用这些改性纳米颗粒，我们能够利用磁场和光实现自组装的正交控制。
