Magnetic field-induced self-assembly of iron oxide nanocubes.
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.
Department of Organic Chemistry, Weizmann Institute of Science, Rehovot 76100, Israel. rafal.klajn@weizmann.ac.il.
Gurvinder
G
Singh
Henry
H
Chan
T
T
Udayabhaskararao
Elijah
E
Gelman
Davide
D
Peddis
Artem
A
Baskin
Gregory
G
Leitus
Petr
P
Král
Rafal
R
Klajn