期刊
SOFT MATTER
卷 14, 期 7, 页码 1080-1087出版社
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7sm02174g
关键词
-
类别
资金
- Netherlands Organization for Scientific Research (NWO)
- Austrian Science Fund (FWF): START-Projekt [Y 627-N27]
- Russian Federation Ministry of Science and Education [3.1438.2017/4.6]
- ETN-COLLDENSE (H2020-MSCA-ITN) [642774]
- NSF CAREER [DMR-1653465]
- University of Chicago Materials Research Science and Engineering Center - National Science Foundation [DMR-1420709]
- Packard Foundation
- US NSF [DMR-1420709]
- NSF [DMR-0923251]
- Alexander von Humboldt Foundation
For magnetite spherical nanoparticles, the orientation of the dipole moment in the crystal does not affect the morphology of either zero field or field induced structures. For non-spherical particles however, an interplay between particle shape and direction of the magnetic moment can give rise to unusual behaviors, in particular when the moment is not aligned along a particle symmetry axis. Here we disclose for the first time the unique magnetic properties of hematite cubic particles and show the exact orientation of the cubes' dipole moment. Using a combination of experiments and computer simulations, we show that dipolar hematite cubes self-organize into dipolar chains with morphologies remarkably different from those of spheres, and demonstrate that the emergence of these structures is driven by competing anisotropic interactions caused by the particles' shape anisotropy and their fixed dipole moment. Furthermore, we have analytically identified a specific interplay between energy, and entropy at the microscopic level and found that an unorthodox entropic contribution mediates the organization of particles into the kinked nature of the dipolar chains.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据