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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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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 Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
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Kinetic Studies and Significance
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Optimizing the Growth of Endothiapepsin Crystals for Serial Crystallography Experiments
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Crystal Nucleation Kinetics and Mechanism: Influence of Interaction Potential.

Porhouy Minh1, Steven W Hall2, Ryan S DeFever3

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Altering intermolecular forces in colloidal systems changes crystal structure without affecting nucleation rates. This allows for tailored material properties through controlled polymorph selection.

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Area of Science:

  • Materials Science
  • Physical Chemistry
  • Computational Chemistry

Background:

  • Controlling liquid-to-solid transitions and crystalline structures is crucial for tailoring material properties.
  • Understanding the link between intermolecular interactions and crystallization behavior in colloidal systems remains a challenge.

Purpose of the Study:

  • To investigate how modifications in intermolecular interactions influence nucleation pathways and crystal structure in colloidal systems.
  • To explore the impact of a softer Lennard-Jones potential (7-6) compared to the standard 12-6 potential on crystallization.

Main Methods:

  • Simulations of colloidal systems using modified Lennard-Jones potentials (12-6 and 7-6).
  • Investigation at identical thermodynamic conditions (supercooling and pressure) for direct comparison.
  • Analysis of nucleation rates, pathways, and resulting crystal structures (FCC, BCC).

Main Results:

  • Nucleation rates were comparable for both the 12-6 and 7-6 potentials at the same supercooling and pressure.
  • The 12-6 potential predominantly resulted in face-centered cubic (FCC) structures.
  • Softening the potential (7-6) led to distinct nucleation pathways, favoring both body-centered cubic (BCC) and FCC structures.

Conclusions:

  • Polymorph selection can be achieved by modifying intermolecular interactions without altering nucleation kinetics.
  • This finding has significant implications for designing strategies for controlling crystal polymorphism and self-assembly processes.