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Related Concept Videos

Ionic Bonding and Electron Transfer02:48

Ionic Bonding and Electron Transfer

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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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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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Metallic Solids02:37

Metallic Solids

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Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
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Formation of Complex Ions03:45

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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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Ion Exchange01:17

Ion Exchange

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Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
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Valence Bond Theory02:42

Valence Bond Theory

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Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
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Characterization of Electrode Materials for Lithium Ion and Sodium Ion Batteries Using Synchrotron Radiation Techniques
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Building intercalation structure for high ionic conductivity via aliovalent substitution.

Zongdong Sun1, Jianing Liang1, Kailang Liu1

  • 1State Key Laboratory of Materials Processing and Die & Mould Technology, and School of Materials Science and Engineering, Huazhong University of Science and Technology, Wuhan 430074, China.

Science Bulletin
|May 21, 2023
PubMed
Summary

Researchers developed a new method using two-dimensional (2D) materials with negative surface charge and mobile ions to significantly enhance ionic conductivity in nanofluids for energy applications.

Keywords:
2D nanofluidicsIntercalation structureIonic conductivityLiquid exfoliation

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Area of Science:

  • Materials Science
  • Nanotechnology
  • Electrochemistry

Background:

  • Two-dimensional (2D) materials offer promising platforms for nanofluids due to their nanochannels, high flux, and scalable fabrication.
  • Efficient ionic conductivity is crucial for advancing nanofluidic devices in energy conversion and ionic sieving applications.

Purpose of the Study:

  • To develop a novel strategy for boosting ionic conductivity in 2D materials via aliovalent substitution.
  • To create intercalation crystal structures with negative surface charge and mobile interlamellar ions.

Main Methods:

  • Synthesized Li2xM1-xPS3 (M = Cd, Ni, Fe) crystals using a solid-state reaction.
  • Investigated water absorption and interlayer spacing variations (0.67 to 1.20 nm).
  • Assembled membranes and measured ionic conductivity.

Main Results:

  • Achieved ultrahigh ionic conductivity: 1.20 S/cm for Li0.5Cd0.75PS3 and 1.01 S/cm for Li0.6Ni0.7PS3.
  • Demonstrated distinct water absorption capabilities and significant changes in interlayer spacing.
  • Successfully created materials with negative surface charge and mobile interlamellar ions.

Conclusions:

  • The aliovalent substitution strategy effectively enhances ionic conductivity in 2D materials.
  • The developed Li2xM1-xPS3 materials show potential for high-performance nanofluidic devices.
  • This approach provides inspiration for designing other 2D materials with improved ionic transport for energy applications.