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Related Concept Videos

Precipitation of Ions03:11

Precipitation of Ions

Predicting Precipitation
The equation that describes the equilibrium between solid calcium carbonate and its solvated ions is:
Precipitation Reactions03:10

Precipitation Reactions

In a precipitation reaction, aqueous solutions of soluble salts react to give an insoluble ionic compound – the precipitate. The reaction occurs when oppositely charged ions in solution overcome their attraction for water and bind to each other, forming a precipitate that separates out from the solution. Since such reactions involve the exchange of ions between ionic compounds in aqueous solution, they are also referred to as double displacement, double replacement, exchange reactions, or...
Ionic Association01:28

Ionic Association

The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
Types of Coprecipitation01:10

Types of Coprecipitation

Coprecipitation is the contamination of a precipitate by otherwise soluble species and occurs via different processes. In colloidal precipitates, coprecipitation occurs via surface adsorption. For instance, barium sulfate has a primary layer of adsorbed barium ions and a secondary layer of nitrate counterions. This results in contamination of the precipitate by barium nitrate.
Sometimes, ions in a crystal lattice can undergo isomorphous replacement by inclusions of similar charge and size. For...
Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

Substances that undergo either a physical or a chemical change in solution to yield ions that can conduct electricity are called electrolytes. If a substance yields ions in solution, that is, if the compound undergoes 100% dissociation, then the substance is a strong electrolyte. Complete dissociation is indicated by a single forward arrow. For example, water-soluble ionic compounds like sodium chloride dissociate into sodium cations and chloride anions in aqueous solution.

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Solid-state Graft Copolymer Electrolytes for Lithium Battery Applications
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Precipitation patterns with polygonal boundaries between electrolytes.

Changwei Pan1, Qingyu Gao, Jingxuan Xie

  • 1College of Chemical Engineering, China University of Mining and Technology, Xuzhou, 221008, China.

Physical Chemistry Chemical Physics : PCCP
|November 20, 2009
PubMed
Summary
This summary is machine-generated.

Polygonal boundaries in Liesegang patterns create complex structures like spirals and dislocations. The number of boundary vertices influences pattern formation, with fewer vertices leading to more pronounced effects.

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Area of Science:

  • Chemical precipitation patterns
  • Complex systems dynamics
  • Pattern formation in nature

Background:

  • Liesegang patterns exhibit diverse structures like dislocations, branches, and spirals.
  • These patterns can be observed in natural phenomena.
  • The shape of the electrolyte boundary influences pattern complexity.

Purpose of the Study:

  • To investigate the formation of two-dimensional Liesegang patterns with polygonal boundaries.
  • To understand the relationship between boundary geometry and pattern characteristics.
  • To model and simulate observed pattern phenomena.

Main Methods:

  • Formation of two-dimensional Liesegang patterns using polygonal electrolyte boundaries.
  • Experimental observation of pattern features such as dislocations, branches, and spirals.
  • Development of a simple nucleation growth model for simulation.

Main Results:

  • Polygonal boundaries generate dislocations, branches, and spirals.
  • The number of vertices on the boundary correlates with the effect's strength.
  • Pentagonal boundaries produce double-armed spirals, while hexagonal boundaries yield concentric rings.
  • Simulations successfully replicate experimental observations of dislocations and spirals.

Conclusions:

  • The geometry of the electrolyte boundary is a critical factor in Liesegang pattern formation.
  • A simple nucleation growth model can effectively simulate complex Liesegang patterns.
  • The study provides insights into pattern formation mechanisms relevant to both chemical systems and natural phenomena.