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Related Concept Videos

Valence Bond Theory02:42

Valence Bond Theory

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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...
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Atomic Nuclei: Nuclear Relaxation Processes01:23

Atomic Nuclei: Nuclear Relaxation Processes

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In the absence of an external magnetic field, nuclear spin states are degenerate and randomly oriented. When a magnetic field is applied, the spins begin to precess and orient themselves along (lower energy) or against (higher energy) the direction of the field. At equilibrium, a slight excess population of spins exists in the lower energy state. Because the direction of the magnetic field is fixed as the z-axis,  the precessing magnetic moments are randomly oriented around the z-axis.
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Colors and Magnetism03:02

Colors and Magnetism

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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...
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Colloidal precipitates01:09

Colloidal precipitates

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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
939
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.4K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.4K
Atomic Nuclei: Nuclear Magnetic Moment00:59

Atomic Nuclei: Nuclear Magnetic Moment

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All atomic nuclei are positively charged. When they have a nonzero spin, they behave like rotating charges. As a consequence of their charge and spin, these nuclei generate a magnetic field (B). This, in turn, gives rise to a magnetic moment (μ), which is randomly oriented in the absence of an external magnetic field. When an external magnetic field (B0) is applied, the magnetic moment vectors can align with the field or against it in 2 + 1 orientations. A hydrogen nucleus, which is just a...
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Related Experiment Video

Updated: Oct 15, 2025

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

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Rotation dynamics and internal structure of self-assembled binary paramagnetic colloidal clusters.

Mohammed Elismaili1, Lydiane Bécu1, Hong Xu1

  • 1Université de Lorraine, LCP-A2MC, F-57000 Metz, France.

The Journal of Chemical Physics
|October 23, 2021
PubMed
Summary
This summary is machine-generated.

Binary colloid clusters in a magnetic field exhibit unique rotation dynamics. Particle size and internal structure influence rotation speed, revealing insights into dissipative nonequilibrium systems.

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Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
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Area of Science:

  • Soft Matter Physics
  • Colloid Science
  • Nonlinear Dynamics

Background:

  • Paramagnetic colloids form self-assembled clusters.
  • These clusters exist in a dissipative nonequilibrium state under external fields.
  • Understanding cluster dynamics is crucial for materials science.

Purpose of the Study:

  • Investigate the rotation dynamics of 2D binary colloid clusters.
  • Analyze the influence of particle size and magnetic field on rotation.
  • Explore internal particle segregation and its effect on dynamics.

Main Methods:

  • Experimental studies of binary colloid clusters.
  • Theoretical modeling of cluster dynamics.
  • Analysis of viscoelastic shear waves and particle distribution.

Main Results:

  • Binary clusters rotate slower than the magnetic field.
  • Rotation velocity depends on the concentration of larger particles.
  • Particle segregation within clusters affects rotation.
  • Clusters display short-range order characteristic of viscoelastic liquids.

Conclusions:

  • A generalized theoretical model accurately predicts cluster rotation.
  • Internal structure and composition significantly impact cluster dynamics.
  • The findings contribute to understanding driven soft matter systems.