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Related Concept Videos

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.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
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Ions are atoms or molecules bearing an electrical charge. A cation (a positive ion) forms when a neutral atom loses one or more electrons from its valence shell, and an anion (a negative ion) forms when a neutral atom gains one or more electrons in its valence shell. Compounds composed of ions are called ionic compounds (or salts), and their constituent ions are held together by ionic bonds: electrostatic forces of attraction between oppositely charged cations and anions. 
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Pore Transport and Ion-Pair Transport01:17

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Pore transport and ion-pair formation are critical mechanisms for the absorption and distribution of drugs in the body.
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A type of Lewis acid-base chemistry involves the formation of a complex ion (or a coordination complex) comprising a central atom, typically a transition metal cation, surrounded by ions or molecules called ligands. These ligands can be neutral molecules like H2O or NH3, or ions such as CN− or OH−. Often, the ligands act as Lewis bases, donating a pair of electrons to the central atom. These types of Lewis acid-base reactions are examples of a broad subdiscipline called coordination...
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Transport Number01:31

Transport Number

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The transport number is the fraction of the total current carried by an ion in an electrolyte solution. It is defined as the ratio of the current carried by a specific ion to the total current flowing through the solution. The transport number, t, is central to understanding ionic mobility, which describes how fast an ion moves under the influence of an electric field. This link connects the physical behavior of ions in solution to the chemical processes that occur during electrochemical...
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Common Ion Effect03:24

Common Ion Effect

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Châtelier’s principle. Consider the dissolution of silver iodide:
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Monovalent Cation Doping of CH3NH3PbI3 for Efficient Perovskite Solar Cells
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Iodide uptake by negatively charged clay interlayers?

Andrew Miller1, Jessica Kruichak2, Melissa Mills2

  • 1Emporia State University, 1 Kellogg Circle, Emporia, KS, 66801, United States.

Journal of Environmental Radioactivity
|June 10, 2015
PubMed
Summary
This summary is machine-generated.

Iodide interacts with clay minerals, contrary to prior assumptions. This study proposes a conceptual model explaining iodide uptake by clays through ion-pairing in confined spaces.

Keywords:
Clay mineralsIon pairingNuclear wasteRadioiodine

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Area of Science:

  • Geochemistry
  • Environmental Science
  • Materials Science

Background:

  • Iodide interactions with clay minerals are crucial for nuclear waste disposal risk assessment.
  • Previous models assumed minimal iodide interaction with negatively charged clay layers due to electrical repulsion.
  • Emerging research suggests weak but significant iodide-clay interactions.

Purpose of the Study:

  • To develop a conceptual model for iodide interactions with various clay minerals.
  • To investigate the influence of clay mineral structure and composition on iodide uptake.
  • To explore the role of electrolyte composition and concentration in iodide-clay interactions.

Main Methods:

  • Conducted iodide uptake experiments using a suite of clay minerals with diverse properties.
  • Varied swamping electrolyte identities (NaCl, NaBr, KCl) and concentrations.
  • Analyzed iodide uptake trends in relation to clay mineral characteristics and solution chemistry.

Main Results:

  • Iodide uptake exhibited distinct trends correlated with cation exchange capacity and clay mineral structure.
  • Observed significant changes in uptake behavior with electrolyte composition and concentration.
  • No substantial effect of solution pH on iodide uptake was detected.
  • Evidence suggests direct iodide interaction via ion-pairing (e.g., NaI(aq)) within clay interlayers and associated structured water zones.

Conclusions:

  • Iodide can directly interact with clay minerals, challenging previous assumptions.
  • Ion-pairing and concentration in confined clay spaces are driven by reduced water dielectric constants and iodide polarizability.
  • The proposed conceptual model provides a framework for understanding iodide behavior in geological repositories.