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Ionic Crystal Structures

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...

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Related Experiment Video

Updated: May 24, 2025

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

Published on: September 27, 2011

Kinetically Trapped Nanocrystals with Symmetry-Preserving Shapes.

Carlos L Bassani¹, Michael Engel¹

¹Institute for Multiscale Simulation, IZNF, Friedrich-Alexander-Universität Erlangen-Nürnberg, 91058 Erlangen, Germany.

Journal of the American Chemical Society

|March 4, 2025

Summary

Controlling nanocrystal shape is key for their properties. This study reveals kinetic factors like adatom nucleation energies and growth island geometry dictate metastable shapes, guiding precise synthesis.

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Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control

Published on: February 11, 2018

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Last Updated: May 24, 2025

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

Utilization of Plasmonic and Photonic Crystal Nanostructures for Enhanced Micro- and Nanoparticle Manipulation

Published on: September 27, 2011

Optical Trapping of Nanoparticles

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Published on: January 15, 2013

Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control

Fabrication of Spherical and Worm-shaped Micellar Nanocrystals by Combining Electrospray, Self-assembly, and Solvent-based Structure Control

Published on: February 11, 2018

Area of Science:

Materials Science
Nanotechnology
Chemical Physics

Background:

Nanocrystal shape critically influences surface area, reactivity, optical properties, and self-assembly.
Current shape control relies on empirical methods, necessitating a robust theoretical framework.

Purpose of the Study:

To develop a comprehensive model for nanocrystal shape formation by analyzing kinetic factors.
To identify key determinants of nanocrystal morphology during growth.

Main Methods:

Modeling kinetic factors at distinct growth stages (terraces, ledges, kinks).
Analyzing adatom nucleation energies and growth island geometry.
Illustrating concepts with face-centered cubic nanocrystal simulations.

Main Results:

Kinetics at transient sites dominate growth, leading to kinetically trapped, metastable shapes.
Adatom nucleation energies and growth island geometry are primary shape determinants.
Observed diverse shape evolutions including surface roughening and symmetry preservation.

Conclusions:

Revealed the underlying mechanisms governing the formation of cubic nanocrystal shapes.
Provides a theoretical framework for understanding and controlling nanocrystal morphology.
Offers guidance for the precise synthesis of nanocrystals with desired shapes.