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Related Concept Videos

Factors Affecting Dissolution: Polymorphism, Amorphism and Pseudopolymorphism01:21

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Polymorphism refers to the existence of a drug substance in multiple crystalline forms, known as polymorphs. Recently, this term has been expanded to include solvates (forms containing a solvent), amorphous forms (non-crystalline forms), and desolvated solvates (forms from which the solvent has been removed).
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An SN2 reaction of an alkyl halide is a single-step process in which bond formation between the nucleophile and the substrate and bond breaking between the substrate and the halide occurs simultaneously through a transition state without forming an intermediate.
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Isomerism in Complexes
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Measuring Cation Transport by Na,K- and H,K-ATPase in Xenopus Oocytes by Atomic Absorption Spectrophotometry: An Alternative to Radioisotope Assays
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Transient Polymorphism in NaCl.

Federico Giberti1,2, Gareth A Tribello1,2,3, Michele Parrinello1,2

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|November 20, 2015
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Summary
This summary is machine-generated.

Researchers developed a new method to observe ion nucleation events in simulations. For sodium chloride solutions, small ion clusters form a wurtzite-like structure, not the typical rocksalt structure.

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Area of Science:

  • Computational chemistry
  • Materials science
  • Chemical physics

Background:

  • Atomistic simulations are crucial for understanding ion behavior.
  • Observing rare nucleation events in simulations remains a challenge.
  • Standard simulation methods may not accurately capture early-stage cluster structures.

Purpose of the Study:

  • To introduce a novel collective variable (CV) for enhanced observation of nucleation events.
  • To investigate the structural stability of small sodium chloride clusters.
  • To compare simulation findings with established bulk structures.

Main Methods:

  • Development and application of a new collective variable (CV) in biased atomistic simulations.
  • Utilizing metadynamics simulations to study nucleation.
  • Analysis of cluster structures in sodium chloride solutions.

Main Results:

  • The new CV successfully increased the frequency of observed nucleation events.
  • For small clusters, a wurtzite-like structure was found to be more stable than the bulk rocksalt structure.
  • The CV allows aggregation without enforcing a specific ion ordering.

Conclusions:

  • The developed CV is effective for studying nucleation dynamics.
  • Early-stage sodium chloride nucleation favors non-bulk structures.
  • Simulation insights challenge existing models of ion cluster formation.