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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...
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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...
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Temperature-Controlled Assembly and Characterization of a Droplet Interface Bilayer
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Published on: April 19, 2021

Communication: Thermal rectification in liquids by manipulating the solid-liquid interface.

Sohail Murad1, Ishwar K Puri

  • 1Department of Chemical Engineering, University of Illinois at Chicago, Chicago, Illinois 60607, USA. murad@uic.edu

The Journal of Chemical Physics
|September 4, 2012
PubMed
Summary
This summary is machine-generated.

Thermal rectification, a key for nano-device efficiency, was demonstrated in liquid water. Researchers found interfacial resistance significantly impacts thermal rectification more than external forces.

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Area of Science:

  • Condensed Matter Physics
  • Materials Science
  • Nanotechnology

Background:

  • Thermal rectification, essential for thermal management in nano-devices, relies on nonlinear thermal resistance.
  • Traditionally, thermal rectification is observed in solids, but their structural rigidity limits device tunability.
  • Liquids offer greater tunability, presenting new opportunities for thermal rectification applications.

Purpose of the Study:

  • To demonstrate thermal rectification in liquid water using molecular dynamics simulations.
  • To explore methods for creating inhomogeneous liquid phases for rectification.
  • To investigate the influence of interfacial resistance and external forces on thermal rectification.

Main Methods:

  • Utilized molecular dynamics simulations to model heat transport in confined liquid water.
  • Created an inhomogeneous water phase by altering surface morphology or applying external forces (electric/magnetic).
  • Analyzed the contributions of interfacial (Kapitza) thermal resistance and fluid density gradients to rectification.

Main Results:

  • Successfully demonstrated thermal rectification in liquid water.
  • Identified both interfacial thermal resistance and fluid density gradients as key factors influencing rectification magnitude.
  • Found that interfacial resistance plays a more dominant role than external forces applied to the bulk fluid.

Conclusions:

  • Liquid water can exhibit thermal rectification, opening new avenues for tunable thermal management devices.
  • Controlling solid-fluid interfacial properties is crucial for optimizing thermal rectification in liquid systems.
  • This study highlights the potential of liquids for advanced thermal management solutions.