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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

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A superconductor is a substance that offers zero resistance to the electric current when it drops below a critical temperature. Zero resistance is not the only interesting phenomenon as materials reach their transition temperatures. A second effect is the exclusion of magnetic fields. This is known as the Meissner effect. A light, permanent magnet placed over a superconducting sample will levitate in a stable position above the superconductor. High-speed trains that levitate on strong...
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The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
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Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
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A substance that reaches superconductivity, a state in which magnetic fields cannot penetrate, and there is no electrical resistance, is referred to as a superconductor. In 1911, Heike Kamerlingh Onnes of Leiden University, a Dutch physicist, observed a relation between the temperature and the resistance of the element mercury. The mercury sample was then cooled in liquid helium to study the linear dependence of resistance on temperature. It was observed that, as the temperature decreased, the...
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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.
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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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From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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Colloidal superionic conductors.

Yange Lin1, Monica Olvera de la Cruz1,2,3

  • 1Department of Chemistry, Northwestern University, Evanston, IL 60208.

Proceedings of the National Academy of Sciences of the United States of America
|April 5, 2023
PubMed
Summary
This summary is machine-generated.

Colloidal crystals with asymmetric nanoparticles transform from insulators to conductors and then liquids under electric fields. These superionic conductors exhibit unique charge transport properties, defying typical metallic behavior.

Keywords:
colloidal crystalsdissipationlane formationsublattice meltingthermodynamic uncertainty relations

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Area of Science:

  • Colloidal science
  • Condensed matter physics
  • Materials science

Background:

  • Nanoparticles with asymmetric sizes and charges can self-assemble into crystals via electrostatic interactions.
  • These colloidal crystals may exhibit properties similar to metals or superionic materials.
  • Understanding charge transport in such systems is crucial for developing novel electronic materials.

Purpose of the Study:

  • To investigate the response of binary charged colloidal crystals to external electric fields.
  • To characterize the transitions between different conductive and insulating states.
  • To explore the charge transport mechanisms and thermodynamic properties of colloidal superionic conductors.

Main Methods:

  • Coarse-grained molecular simulations.
  • Underdamped Langevin dynamics.
  • Analysis of resistivity, temperature dependence, and electric field effects.

Main Results:

  • Observed transitions from insulator to superionic (conductive), laning, and liquid states with increasing electric field strength.
  • In the superionic state, resistivity decreased with increasing temperature, contrary to metals.
  • Thermodynamic uncertainty relation was verified for system dissipation and charge current fluctuations.

Conclusions:

  • The study elucidates charge transport mechanisms in colloidal superionic conductors.
  • The findings reveal unique electrical properties of self-assembled colloidal crystals under electric fields.
  • This research contributes to the understanding of emergent phenomena in soft condensed matter systems.