Related Experiment Video
Updated: Mar 3, 2026
09:02
Using Polystyrene-block-polyacrylic acid-coated Metal Nanoparticles as Monomers for Their Homo- and Co-polymerization
Published on: July 9, 2015
12.9K
How cube-like must magnetic nanoparticles be to modify their self-assembly?
Joe G Donaldson1, Per Linse, Sofia S Kantorovich
1Faculty of Physics, Boltzmanngasse 5, University of Vienna, Vienna, Austria. joe.donaldson@univie.ac.at.
Nanoscale
|May 4, 2017
Summary
Magnetic nanoparticles offer tunable magnetic responses. Superball shape influences self-assembly, shifting transitions from chain to ring structures and enabling asymmetric ring formations.
Area of Science:
- Materials Science
- Condensed Matter Physics
- Statistical Mechanics
Background:
- Tunable magnetic nanoparticles are crucial functional materials.
- Superball nanoparticles offer tunable shapes between spheres and cubes.
- Understanding self-assembly is key to controlling magnetic properties.
Purpose of the Study:
- Investigate the self-assembly of magnetic superballs.
- Explore the effect of superball shape on assembly behavior.
- Characterize the transition from chain to ring structures.
Main Methods:
- Analytical calculations.
- Molecular dynamics simulations.
- Systematic variation of superball shape parameter.
Main Results:
- The chain-to-ring transition shifts to larger cluster sizes as superballs become more cubic.
- Asymmetric ring configurations emerge as a competing stable state.
- Superball shape significantly alters self-assembly pathways.
Conclusions:
- Superball shape provides a route to control magnetic nanoparticle self-assembly.
- The findings offer insights into designing functional magnetic materials.
- This work bridges the understanding between spherical and cubic nanoparticle behavior.
Related Concept Videos
01:30Paramagnetism
3.1K
Paramagnets are materials with unpaired electrons that possess a finite magnetic moment. In the absence of a magnetic field, these moments are randomly oriented, and thus the net moment is zero. Under an external field, a torque acting on the moments tends to align them along the field's direction. However, the random thermal motion of electrons produces a torque opposite to the external field and tries to disorient the moments. These two competing effects align only a few moments along the...
3.1K
02:42Valence Bond Theory
11.4K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
11.4K
02:41Protein Complex Assembly
17.0K
Proteins can form homomeric complexes with another unit of the same protein or heteromeric complexes with different types. Most protein complexes self-assemble spontaneously via ordered pathways, while some proteins need assembly factors that guide their proper assembly. Despite the crowded intracellular environment, proteins usually interact with their correct partners and form functional complexes.
Many viruses self-assemble into a fully functional unit using the infected host cell to...
Many viruses self-assemble into a fully functional unit using the infected host cell to...
17.0K
03:02Colors and Magnetism
14.3K
Color in Coordination Complexes
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
When atoms or molecules absorb light at the proper frequency, their electrons are excited to higher-energy orbitals. For many main group atoms and molecules, the absorbed photons are in the ultraviolet range of the electromagnetic spectrum, which cannot be detected by the human eye. For coordination compounds, the energy difference between the d orbitals often allows photons in the visible range to be absorbed and emitted, which is seen as colors by the human...
14.3K