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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...
Solid–Solid Solutions01:24

Solid–Solid Solutions

The temperature-composition phase diagram of two solids, A and B, which are immiscible in the solid phase but form miscible liquids, shows that when the temperature is low, these two exist as separate, pure solids (A and B). As the temperature increases, they transition into a single-phase liquid solution where A and B coexist. Moving from point a1 to a2 in the phase diagram, the composition changes such that solid B begins to separate from the solution, enriching the remaining liquid with A.
Phase Transitions02:31

Phase Transitions

Whether solid, liquid, or gas, a substance's state depends on the order and arrangement of its particles (atoms, molecules, or ions). Particles in the solid pack closely together, generally in a pattern. The particles vibrate about their fixed positions but do not move or squeeze past their neighbors. In liquids, although the particles are closely spaced, they are randomly arranged. The position of the particles are not fixed—that is, they are free to move past their neighbors to occupy...
Phase Transitions: Sublimation and Deposition02:33

Phase Transitions: Sublimation and Deposition

Some solids can transition directly into the gaseous state, bypassing the liquid state, via a process known as sublimation. At room temperature and standard pressure, a piece of dry ice (solid CO2) sublimes, appearing to gradually disappear without ever forming any liquid. Snow and ice sublimate at temperatures below the melting point of water, a slow process that may be accelerated by winds and the reduced atmospheric pressures at high altitudes. When solid iodine is warmed, the solid sublimes...
Phase Changes01:19

Phase Changes

Phase transitions play an important theoretical and practical role in the study of heat flow. In melting or fusion, a solid turns into a liquid; the opposite process is freezing. In evaporation, a liquid turns into a gas; the opposite process is condensation.
A substance melts or freezes at a temperature called its melting point and boils or condenses at its boiling point. These temperatures depend on pressure. High pressure favors the denser form of the substance, so typically, high pressure...
Phase Diagrams of Ternary Systems01:28

Phase Diagrams of Ternary Systems

Consider a ternary system, which is composed of three components: water (W), ethanoic acid (E), and trichloromethane (T). Here, Ethanoic acid (E) is fully miscible with both water (W) and trichloromethane (T), meaning it can mix entirely with either of them. However, water and trichloromethane have partial miscibility, meaning they can only mix to a certain extent, beyond which two separate phases will form.The phase diagram of a ternary system is represented as an equilateral triangle, where...

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Phase Diagram Characterization Using Magnetic Beads as Liquid Carriers
12:37

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Published on: September 4, 2015

Embedded binary eutectic alloy nanostructures: a new class of phase change materials.

S J Shin1, J Guzman, C-W Yuan

  • 1Department of Materials Science and Engineering, University of California, Berkeley, California 94720, USA.

Nano Letters
|August 12, 2010
PubMed
Summary
This summary is machine-generated.

This study introduces phase change material nanoparticles embedded in a matrix, offering a novel approach for applications in data and energy storage. The composition of these nanoparticles can be tuned to control their switching behavior.

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Published on: November 27, 2015

Area of Science:

  • Materials Science
  • Nanotechnology
  • Solid-State Physics

Background:

  • Phase change materials (PCMs) are critical for technologies like optical data storage and energy storage.
  • Developing bulk PCMs for specific applications is an active area of research.

Purpose of the Study:

  • To explore a novel approach using binary eutectic alloy nanoparticles embedded within a matrix as phase change materials.
  • To demonstrate the stabilization of nanobicrystal and homogeneous alloy morphologies using a nanoparticle/matrix interface.
  • To show that the switching kinetics can be controlled by altering the nanoparticle composition.

Main Methods:

  • Utilizing germanium-tin (GeSn) alloy nanoparticles embedded in a silica matrix as a model system.
  • Investigating the influence of the nanoparticle/matrix interface on material morphology.
  • Analyzing the effect of alloy composition on the phase switching kinetics.

Main Results:

  • The nanoparticle/matrix interface successfully stabilizes both nanobicrystal and homogeneous alloy morphologies.
  • The kinetics of switching between these morphologies are tunable.
  • Altering the composition of the GeSn nanoparticles directly influences the switching speed and behavior.

Conclusions:

  • Binary eutectic alloy nanoparticles embedded in a matrix offer a promising alternative to bulk phase change materials.
  • The interface engineering at the nanoscale provides control over phase morphology and switching dynamics.
  • This approach allows for the fine-tuning of phase change material properties for diverse technological applications.