Abstract
Control over the self-assembly of magnetic nanoparticles (MNP) into superstructures due to different types of coupling is of interest in the development of "bottom-up" fabrication schemes. Here we realize a simple strategy for the systematic variation of particle interaction potential in magnetic nanoparticles. This is achieved by varying the effective surface potential by means of a co-surfactant introduced in the course of the synthesis process. As a consequence, the ability to form chain-like assemblies is affected by the resulting balance of attractive and repulsive forces. We use electron microscopy, electron diffraction, and light scattering methods to study a series of cobalt nanoparticles as a characteristic example of ferromagnetic MNP. We demonstrate experimentally and substantiate theoretically that the observed behavior results from a balance between magnetic dipole-dipole, steric, and electrostatic interactions.
Original language | English |
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Pages (from-to) | 83-89 |
Number of pages | 7 |
Journal | Journal of Colloid and Interface Science |
Volume | 436 |
DOIs | |
State | Published - 15 Dec 2014 |
Keywords
- Chain-like objects
- Dipolar particle coupling
- Ferromagnetic nanoparticles
- Interaction potential
- Magnetic super-structures
- Nanoparticle self-assembly
ASJC Scopus subject areas
- Electronic, Optical and Magnetic Materials
- Biomaterials
- Surfaces, Coatings and Films
- Colloid and Surface Chemistry