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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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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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The formation of a solution is an example of a spontaneous process, which is a process that occurs under specified conditions without energy from some external source.
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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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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called...
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Reconstructing solute-induced phase transformations within individual nanocrystals.

Tarun C Narayan1, Andrea Baldi1,2, Ai Leen Koh3

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Summary
This summary is machine-generated.

Strain and defects in nanomaterials affect performance. Palladium nanocrystals show varied hydrogen distribution based on their structure, with icosahedra excluding hydrogen from strained areas.

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Physical Chemistry

Background:

  • Strain and defects critically influence functional nanomaterial performance.
  • Energy storage systems demonstrate this, where structural changes drive phase transformations during operation.
  • Understanding nanoparticle structure-solute interactions is key for designing advanced storage materials.

Purpose of the Study:

  • To experimentally map hydride phase distribution in individual palladium nanocrystals during hydrogen absorption.
  • To investigate the correlation between nanocrystal structure, strain, and solute uptake.
  • To provide insights into nanoscale phase transformations in reactive environments.

Main Methods:

  • Utilized environmental transmission electron microscopy (ETEM).
  • Combined electron spectroscopy, dark-field imaging, and electron diffraction.
  • Analyzed hydrogen distribution within individual palladium nanocrystals.

Main Results:

  • Single-crystalline palladium nanocrystal cubes and pyramids displayed uniform hydrogen distribution at equilibrium.
  • Multiply twinned icosahedra showed hydrogen exclusion from highly strained regions.
  • Demonstrated structure-dependent hydrogen uptake and phase behavior.

Conclusions:

  • Nanocrystal shape and defect structure dictate hydrogen distribution and phase behavior.
  • The developed technique offers novel insights into nanoscale reactive processes.
  • Applicable to a broad range of functional nanomaterials for energy storage and beyond.