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Related Concept Videos

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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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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The experimental conditions in a gravimetric analysis should be optimized to maximize the particle size and purity of the obtained precipitate. Ideally, the concentration of the precipitating reagent should be low with effective stirring to maintain low relative supersaturation for the growth of large crystals. In homogeneous precipitation, the precipitant is slowly generated by a chemical reaction in the solution to avoid local reagent excesses. For example, urea decomposes gradually to...
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Optimization of Crystal Growth for Neutron Macromolecular Crystallography
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Concentric ring pattern formation in a competing crystallization and phase separation process.

Weichao Shi1, He Cheng, Fenghua Chen

  • 1Beijing National Laboratory for Molecular Sciences, Joint Laboratory of Polymer Science and Materials, Institute of Chemistry, Chinese Academy of Sciences, Beijing, China.

Macromolecular Rapid Communications
|October 11, 2011
PubMed
Summary
This summary is machine-generated.

Phase separation in polymer blends under deep quench can invert spherulitic patterns into concentric rings. This occurs due to enhanced phase separation dynamics at crystal growth interfaces, altering lamellar orientation.

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Methods of Ex Situ and In Situ Investigations of Structural Transformations: The Case of Crystallization of Metallic Glasses
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Published on: June 7, 2018

Area of Science:

  • Polymer Science
  • Materials Science
  • Crystallization Dynamics

Background:

  • Spherulitic patterns are common in polymer blend crystallization.
  • Deep quenching can induce phase separation during crystallization.
  • Standard spherulites exhibit radial lamellar growth.

Purpose of the Study:

  • To investigate the inversion of spherulitic patterns in polymer blends under deep quench conditions.
  • To understand the structural changes from radial to concentric patterns.
  • To identify the driving forces behind altered lamellar orientation.

Main Methods:

  • Utilizing deep quench techniques on polymer blends.
  • Observing crystallization morphology using microscopy.
  • Analyzing the phase separation dynamics at the crystal growth interface.
  • Characterizing lamellar orientation within the resulting structures.

Main Results:

  • Deep quench and intervening phase separation were observed to invert radial spherulitic growth.
  • Concentric alternating crystalline- and amorphous-rich ring structures were formed.
  • Lateral lamellae within crystalline regions oriented tangentially, deviating from the usual radial direction.
  • Concentration deviation-enhanced phase separation dynamics were identified as the key factor.

Conclusions:

  • The observed inversion of spherulitic patterns is a novel phenomenon in polymer blend crystallization.
  • Enhanced phase separation dynamics at the crystal growth interface dictate the structural transformation.
  • Altered lamellar orientation is a direct consequence of these interfacial dynamics.