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Related Concept Videos

Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

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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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Electrolytes: van't Hoff Factor03:08

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Colligative Properties of Electrolytes
The colligative properties of a solution depend only on the number, not on the identity, of solute species dissolved. The concentration terms in the equations for various colligative properties (freezing point depression, boiling point elevation, osmotic pressure) pertain to all solute species present in the solution. Nonelectrolytes dissolve physically without dissociation or any other accompanying process. Each molecule that dissolves yields one...
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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
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Formation of Complex Ions03:45

Formation of Complex Ions

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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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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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Probing ion current in solid-electrolytes at the meso- and nanoscale.

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We developed methods to measure ionic conductivity in silica ionogels at small scales. These solid electrolytes show promising electrochemical properties for meso-scaled energy storage devices.

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Nanotechnology

Background:

  • Silica ionogels are promising solid electrolytes with nanoscale fluidic and high-conductivity properties.
  • Macroscopically, ionogels behave as solids, necessitating methods to probe their conductivity at smaller scales.

Purpose of the Study:

  • To present experimental approaches for probing ionic conductivity of solid electrolytes at the meso- and nanoscales.
  • To validate the electrochemical properties of ionogels at the mesoscale.

Main Methods:

  • Utilized single mesopores in polymer films as templates for casting ionogels.
  • Employed two experimental setups to measure ionic conductivity: a conductivity cell with chambers and direct contact measurements on membranes.
  • Compared mesoscale conductivity measurements with macroscopic conductivity data.

Main Results:

  • Demonstrated that ionic conductivity measurements at the mesoscale using two distinct methods yielded results in excellent agreement.
  • Showcased that mesoscale conductivity aligns with macroscopic measurements, confirming preserved electrochemical properties.
  • Validated the utility of ionogels in designing meso-scaled energy-storage devices.

Conclusions:

  • Experimental approaches effectively probe ionic conductivity of solid electrolytes at meso- and nanoscales.
  • Silica ionogels retain their electrochemical properties at the mesoscale.
  • Ionogels are suitable for developing advanced meso-scaled energy-storage applications.