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Recrystallization: Solid–Solution Equilibria01:10

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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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Crystal Growth: Principles of Crystallization01:25

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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 process of a solid dissolving in a liquid to form a solution is governed by the solubility limit, which is the maximum amount of the solid substance, or solute, that can be dissolved in a specific volume of the liquid or solvent. As the solute dissolves, it reaches a point where no more solute can be dissolved at a given temperature - this is known as the saturation point. However, if further solute is added and it manages to dissolve, the solution becomes supersaturated. Supersaturated...
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Two Components: Liquid–Liquid Systems01:27

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A pressure-composition phase diagram explicitly describes the behavior of an ideal solution of two volatile liquids under varying pressures and compositions. A pressure-composition diagram has two main curves. The bubble point curve represents the plot of pressure versus liquid mole fraction. It indicates the pressure at which the first bubble of vapor forms from the liquid phase as the system pressure decreases.The dew point curve is the pressure versus vapor mole fraction. It indicates the...
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Distillation: Vapor–Liquid Equilibria01:01

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Distillation is a separation technique that takes advantage of the boiling point properties of disparate elements in a mixture. To perform distillation, we begin by heating a miscible mixture of two liquids with a significant difference in boiling points (at least 20°C). As the solution heats up and reaches the bubble point of the more volatile component, some molecules of the more volatile component transition into the gas phase and travel upward into the condenser, which is a glass tube...
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Phase Transitions: Melting and Freezing02:39

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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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Crystal templating through liquid-liquid phase separation.

Joanna Mosses1, David A Turton, Leo Lue

  • 1School of Chemistry, WestCHEM, University of Glasgow, Glasgow G12 8QQ, UK. klaas.wynne@glasgow.ac.uk.

Chemical Communications (Cambridge, England)
|December 4, 2014
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Summary
This summary is machine-generated.

Researchers achieved controlled crystal growth by inducing spinodal decomposition, leading to unique, template-less wire-like ice formations. This discovery offers new pathways for controlling crystal structures.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Crystallography

Background:

  • Controlled crystal nucleation is a significant challenge in materials science.
  • Conventional methods for accelerating crystallization often result in uncontrolled growth patterns.

Purpose of the Study:

  • To investigate novel conditions for achieving controlled crystal nucleation and growth.
  • To explore the potential of highly nonequilibrium states for crystal formation.

Main Methods:

  • Inducing spinodal decomposition in water under specific conditions.
  • Observing crystal growth morphology using microscopy techniques.
  • Analyzing the resulting crystalline structures.

Main Results:

  • Water crystals were observed to grow as thin wires under spinodal decomposition.
  • This template-less crystal formation, known as 'Haareis', occurred under highly nonequilibrium conditions.
  • The growth pattern was distinct from that observed under equilibrium or near-equilibrium conditions.

Conclusions:

  • Highly nonequilibrium conditions, specifically spinodal decomposition, can enable controlled crystal growth.
  • The formation of 'Haareis' demonstrates a novel mechanism for template-less crystal wire growth.
  • These findings suggest new strategies for manipulating crystal formation in various scientific and industrial applications.