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Related Concept Videos

Ionic Crystal Structures02:42

Ionic Crystal Structures

Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

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...
The Electrical Double Layer01:30

The Electrical Double Layer

In the region where two bulk phases meet, an intricate electric charge distribution arises due to charge transfer, ion adsorption, molecular orientation, and charge distortion. This complex distribution is commonly referred to as the electrical double layer.When a solid electrode interfaces with ions in an electrolyte solution, the speed of electron transfer dictates the rates of oxidation and reduction. The electrode acquires a charge through the escape of atoms into the solution as cations or...
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Debye–Huckel–Onsager Conductance Equation01:28

Debye–Huckel–Onsager Conductance Equation

The Debye-Hückel-Onsager equation is a cornerstone of physical chemistry, providing a method to determine the molar conductance (Λm) and molar conductance at infinite dilution (Λ°m) for uni-univalent electrolytes.Uni-univalent electrolytes are electrolytes that dissociate in solution to produce one cation with a +1 charge and one anion with a –1 charge per formula unit.This equation addresses two crucial phenomena: the asymmetry effect and the electrophoretic effect. According to this equation,...
Crystal Field Theory - Tetrahedral and Square Planar Complexes02:46

Crystal Field Theory - Tetrahedral and Square Planar Complexes

Tetrahedral Complexes
Crystal field theory (CFT) is applicable to molecules in geometries other than octahedral. In octahedral complexes, the lobes of the dx2−y2 and dz2 orbitals point directly at the ligands. For tetrahedral complexes, the d orbitals remain in place, but with only four ligands located between the axes. None of the orbitals points directly at the tetrahedral ligands. However, the dx2−y2 and dz2 orbitals (along the Cartesian axes) overlap with the ligands less than the dxy,...

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Measuring Magnetically-Tuned Ferroelectric Polarization in Liquid Crystals
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Charge ordering induces a smectic phase in oblate ionic liquid crystals.

G C Ganzenmüller1, G N Patey

  • 1Fraunhofer Ernst Mach Institute for High-Speed Dynamics, Freiburg, Germany. georg.ganzenmueller@emi.fraunhofer.de

Physical Review Letters
|January 15, 2011
PubMed
Summary

Computer simulations reveal a novel smectic-A phase in charged ellipsoids. This phase counterintuitively layers particles of the same charge, challenging typical nematic behavior in similar systems.

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Area of Science:

  • Soft Matter Physics
  • Computational Materials Science

Background:

  • Electroneutral mixtures of charged ellipsoids are typically nematic.
  • Repulsive ellipsoidal models do not predict layered structures.

Purpose of the Study:

  • To investigate the phase behavior of oppositely charged oblate ellipsoids.
  • To explore the formation of novel liquid crystalline phases.

Main Methods:

  • Computer simulations of an electroneutral mixture.
  • Modeling ellipsoids of revolution with an aspect ratio of 1/3.
  • Analysis of particle packing and orientational order.

Main Results:

  • Observation of a stable smectic-A phase.
  • Counterintuitive layering of like charges within the smectic layers.
  • Layer orientation perpendicular to the nematic director.

Conclusions:

  • Charged ellipsoids can form layered smectic-A phases.
  • Electrostatic interactions drive unexpected self-assembly in soft matter.
  • This finding expands the known phase diagram for anisotropic particles.