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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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Molecular and Ionic Solids02:54

Molecular and Ionic Solids

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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
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
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Ionic Bonds00:42

Ionic Bonds

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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
Ionic bonds are reversible electrostatic interactions between ions...
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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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Hydraulic Jump: Problem Solving01:16

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To analyze a hydraulic jump in a rectangular channel with a flow speed of 6 meters per second, follow these steps:Calculate Effective Upstream Velocity:When the downstream gate closes, a hydraulic jump forms, traveling upstream at 2 meters per second. This wave speed combines with the initial channel flow velocity, creating an effective upstream velocity.Identify Flow Velocities Before and After the Hydraulic Jump:Upstream of the hydraulic jump, the effective flow velocity includes both the...
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Hydraulic Jump01:29

Hydraulic Jump

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A hydraulic jump is a sudden rise in fluid depth in open channels, occurring when high-velocity (supercritical) flow transitions to low-velocity (subcritical) flow. This phenomenon requires an upstream Froude number greater than 1, as flows with Fr1<1 remain subcritical, making a hydraulic jump impossible due to the need for negative head loss, which violates thermodynamic principles.The characteristics of a hydraulic jump depend on the upstream Froude number and are classified as...
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Vibrational Spectra of a N719-Chromophore/Titania Interface from Empirical-Potential Molecular-Dynamics Simulation, Solvated by a Room Temperature Ionic Liquid
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Orientational dynamics in a room temperature ionic liquid: Are angular jumps predominant?

Suman Das1, Biswaroop Mukherjee2, Ranjit Biswas1

  • 1Chemical, Biological and Macromolecular Sciences, S. N. Bose National Centre for Basic Sciences, Block-JD, Sector-III, Salt Lake, Kolkata 700106, India.

The Journal of Chemical Physics
|October 12, 2018
PubMed
Summary
This summary is machine-generated.

The anion [PF6]- in 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) shows more dynamic reorientational behavior than the cation [BMIM]+. This indicates heterogeneous dynamics in ionic liquids, challenging traditional diffusion models.

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Area of Science:

  • Physical Chemistry
  • Materials Science
  • Computational Chemistry

Background:

  • Ionic liquids (ILs) are tunable solvents with unique properties.
  • Understanding ion dynamics is crucial for IL applications.
  • 1-butyl-3-methylimidazolium hexafluorophosphate ([BMIM][PF6]) is a common room-temperature ionic liquid.

Purpose of the Study:

  • To investigate the reorientational dynamics of ions in [BMIM][PF6].
  • To explore the heterogeneity of dynamics within the ionic liquid.
  • To compare the dynamic behavior of the cation ([BMIM]+) and anion ([PF6]-).

Main Methods:

  • Molecular dynamics (MD) simulations were employed.
  • Analysis of ion jump and waiting time distributions.
  • Calculation of reorientational correlation times (l=1, 2).
  • Examination of H-bond lifetimes and structural relaxation.

Main Results:

  • The [PF6]- anion exhibits more frequent orientation jumps and larger jump angles than the [BMIM]+ cation.
  • Power-law dependencies in jump/waiting times suggest temporally heterogeneous dynamics.
  • Debye's diffusion law is significantly violated, indicating non-ideal orientational diffusion.
  • Strong coupling between rotation and translation was observed for both ions, particularly the anion.

Conclusions:

  • The [PF6]- anion displays more heterogeneous dynamics compared to the [BMIM]+ cation.
  • Ion size is a potential factor influencing the observed dynamic differences.
  • Findings challenge conventional models of diffusion in ionic liquids and highlight the need for further investigation.