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Related Concept Videos

Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
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...

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Real-Time Visualization of Solid-Phase Ion Migration Kinetics on Nanowire Monolayer.

Zhen He1, Li Ge Chang2, Yue Lin3

  • 1Division of Nanomaterials & Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, Institute of Energy, Hefei Comprehensive National Science Center, CAS Center for Excellence in Nanoscience, Department of Chemistry, Institute of Biomimetic Materials & Chemistry, University of Science and Technology of China, Hefei 230026, China.

Journal of the American Chemical Society
|April 9, 2020
PubMed
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This study introduces an in-situ ChemTEM method for visualizing solid-phase ion migration in nanowires. The technique reveals migration bridges between nanowires, offering insights into nanoscale ion transport.

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Area of Science:

  • Materials Science
  • Chemistry
  • Nanotechnology

Background:

  • Ion migration is crucial for device performance in chemistry, biology, and materials science.
  • Directly visualizing and quantifying solid-phase ion migration in anisotropic nanostructures remains challenging.

Purpose of the Study:

  • To develop and demonstrate an in-situ method for quantitative investigation of solid-phase ion migration among coassembled nanowires (NWs).
  • To provide critical insights into the kinetics of ion migration at the nanoscale.

Main Methods:

  • Development of an in-situ Chemical Transmission Electron Microscopy (ChemTEM) method.
  • Quantitative investigation of ion migration within and between nanowires (NWs) with nanogaps.
  • Utilizing phase field simulation and ab initio modeling for theoretical evaluation.

Main Results:

  • Successfully tracked solid-phase ion migration within and between nanowires (NWs).
  • Observed a migration 'bridge' facilitating ion transfer between neighboring NWs, even across nanogaps.
  • Demonstrated the applicability to other metal ion migrations on semiconductor NWs.

Conclusions:

  • The in-situ ChemTEM method offers an efficient tool for exploring nanoscale ion migration processes.
  • Findings provide general insights into solid-phase ion migration kinetics in nanoscale systems.
  • Facilitates the future fabrication of customized heteronanostructures.