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Related Concept Videos

Phase Transitions: Melting and Freezing02:39

Phase Transitions: Melting and Freezing

Heating a crystalline solid increases the average energy of its atoms, molecules, or ions, and the solid gets hotter. At some point, the added energy becomes large enough to partially overcome the forces holding the molecules or ions of the solid in their fixed positions, and the solid begins the process of transitioning to the liquid state or melting. At this point, the temperature of the solid stops rising, despite the continual input of heat, and it remains constant until all of the solid is...
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...
Phase Transitions: Vaporization and Condensation02:39

Phase Transitions: Vaporization and Condensation

The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility02:34

Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility

Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
Crystal Growth: Principles of Crystallization01:25

Crystal Growth: Principles of Crystallization

Crystallization is a phase transformation process in which crystals are precipitated from a supersaturated solution or formed from other sources. During crystallization, atoms or molecules arrange themselves into a well-defined, rigid crystal lattice to minimize energy.
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Related Experiment Video

Updated: Jul 19, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Nucleation and melting from nanovoids.

Xian-Ming Bai1, Mo Li

  • 1School of Materials Science and Engineering, Georgia Institute of Technology, Atlanta, Georgia 30332-0245, USA.

Nano Letters
|October 13, 2006
PubMed
Summary

This study reveals four unique melting stages in solids with nanovoids, driven by void size and thermodynamic factors. These findings differ from bulk and nanoparticle melting behaviors.

Area of Science:

  • Materials Science
  • Thermodynamics
  • Computational Physics

Background:

  • Melting phenomena in nanoscale materials are complex.
  • Understanding void melting is crucial for materials design.

Purpose of the Study:

  • To investigate melting behavior in solids with nanovoids.
  • To identify distinct melting stages and their underlying mechanisms.

Main Methods:

  • Molecular dynamics simulations were employed.
  • Finite size effects were analyzed using systems of varying sizes.

Main Results:

  • Four novel stages of void melting were identified.
  • Melting mechanisms involve interfacial free energies, interface curvature, and elastic energy.

More Related Videos

Seedless Growth of Bismuth Nanowire Array via Vacuum Thermal Evaporation
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Seedless Growth of Bismuth Nanowire Array via Vacuum Thermal Evaporation

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Nanothermite with Meringue-like Morphology: From Loose Powder to Ultra-porous Objects
07:46

Nanothermite with Meringue-like Morphology: From Loose Powder to Ultra-porous Objects

Published on: December 24, 2017

Related Experiment Videos

Last Updated: Jul 19, 2026

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
08:55

Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses

Published on: June 7, 2018

Seedless Growth of Bismuth Nanowire Array via Vacuum Thermal Evaporation
08:58

Seedless Growth of Bismuth Nanowire Array via Vacuum Thermal Evaporation

Published on: December 21, 2015

Nanothermite with Meringue-like Morphology: From Loose Powder to Ultra-porous Objects
07:46

Nanothermite with Meringue-like Morphology: From Loose Powder to Ultra-porous Objects

Published on: December 24, 2017

  • Local melting temperatures strongly depend on nanovoid size.
  • Conclusions:

    • Void melting exhibits a complex, hierarchical sequence.
    • The observed melting stages are unique to nanovoid-containing solids.