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Related Concept Videos

Ionic Radii03:10

Ionic Radii

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Ionic radius is the measure used to describe the size of an ion. A cation always has fewer electrons and the same number of protons as the parent atom; it is smaller than the atom from which it is derived. For example, the covalent radius of an aluminum atom (1s22s22p63s23p1) is 118 pm, whereas the ionic radius of an Al3+ (1s22s22p6) is 68 pm. As electrons are removed from the outer valence shell, the remaining core electrons occupying smaller shells experience a greater effective nuclear...
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Overview
When atoms gain or lose electrons to achieve a more stable electron configuration they form ions. Ionic bonds are electrostatic attractions between ions with opposite charges. Ionic compounds are rigid and brittle when solid and may dissociate into their constituent ions in water. Covalent compounds, by contrast, remain intact unless a chemical reaction breaks them.
Opposing Charges Hold Ions Together in Ionic Compounds
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Interference: Path Lengths01:10

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Consider two sources of sound, that may or may not be in phase, emitting waves at a single frequency, and consider the frequencies to be the same.
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Molecular and Ionic Solids02:54

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Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
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Solubility of Ionic Compounds02:55

Solubility of Ionic Compounds

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Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
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Ionic Crystal Structures02:42

Ionic Crystal Structures

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Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
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Fabrication of Carbon Nanotube High-Frequency Nanoelectronic Biosensor for Sensing in High Ionic Strength Solutions
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Screening Lengths in Ionic Fluids.

Fabian Coupette1, Alpha A Lee2, Andreas Härtel1

  • 1Institute of Physics, University of Freiburg, Hermann-Herder-Straße 3, 79104 Freiburg, Germany.

Physical Review Letters
|September 1, 2018
PubMed
Summary
This summary is machine-generated.

Correlations in ionic fluids decay with multiple lengths, challenging previous assumptions. This finding impacts electrolytes, batteries, and soft matter physics applications.

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Area of Science:

  • Soft matter physics
  • Physical chemistry
  • Computational physics

Background:

  • The decay of correlations in ionic fluids is crucial for understanding applications like batteries and colloidal self-assembly.
  • Conventional models, often solvent-free, predict a single decay length for correlations.
  • Real-world electrolyte systems frequently contain a solvent component.

Purpose of the Study:

  • To investigate the impact of a hard sphere solvent on correlation decay in ionic fluids.
  • To determine if multiple decay lengths can exist in such systems.
  • To explain experimental observations in ionic liquid-solvent mixtures.

Main Methods:

  • Analytical theory development.
  • Molecular dynamics simulations.
  • Analysis of correlation functions and structural forces.

Main Results:

  • Demonstrated the coexistence of multiple correlation decay lengths in ionic fluids with a hard sphere solvent.
  • Identified distinct decay lengths at both intermediate and asymptotic distances.
  • Provided a theoretical framework explaining observed phenomena in ionic liquid-solvent mixtures.

Conclusions:

  • The presence of a solvent fundamentally alters correlation decay behavior in ionic fluids.
  • Multiple decay lengths are a key feature of solvent-containing electrolytes.
  • This work reframes understanding of screening lengths in concentrated electrolytes and explains experimental findings.