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Related Concept Videos

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
Colloidal precipitates01:09

Colloidal precipitates

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...
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the involved orbitals. The...
Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must have a...
Spin–Spin Coupling: One-Bond Coupling01:17

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Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
Colloids and Suspensions01:17

Colloids and Suspensions

Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...

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Patterning of Microorganisms and Microparticles through Sequential Capillarity-assisted Assembly
10:17

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Synchronization and beating in dipolarly coupled colloidal rotators.

Pietro Tierno1

  • 1Departament de Química Física, Universitat de Barcelona, Barcelona, Spain. ptierno@ub.edu

The Journal of Physical Chemistry. B
|December 16, 2010
PubMed
Summary
This summary is machine-generated.

In a bidisperse system, paramagnetic microspheres exhibit complex dynamics like synchronization and beating under rotating magnetic fields. Magnetic dipolar interactions significantly influence this beating behavior, leading to distinct rotation frequencies.

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Area of Science:

  • Physics
  • Materials Science
  • Colloid Science

Background:

  • Paramagnetic microspheres confined above circular block walls in garnet films display synchronous or asynchronous dynamics under rotating magnetic fields.
  • Understanding the collective behavior of multiple particles is crucial for micro-device applications.

Purpose of the Study:

  • To investigate the rich dynamical behaviors in a bidisperse system of paramagnetic microspheres.
  • To elucidate the role of magnetic dipolar interactions in observed phenomena such as beating dynamics.

Main Methods:

  • Experimental observation of microsphere dynamics under controlled magnetic fields.
  • Numerical simulations to model and support experimental findings.

Main Results:

  • The bidisperse system exhibits synchronization, beating, and independent particle rotations.
  • Beating dynamics, characterized by two distinct rotation frequencies, are strongly influenced by magnetic dipolar interactions.
  • Experimental data is corroborated by numerical simulations, highlighting the significance of dipolar interactions.

Conclusions:

  • Magnetic dipolar interactions play a critical role in the beating dynamics of bidisperse paramagnetic microsphere systems.
  • The study demonstrates complex emergent behaviors in confined colloidal systems driven by external fields.