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Related Concept Videos

Types Of Superconductors01:28

Types Of Superconductors

1.2K
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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Superconductor01:24

Superconductor

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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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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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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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Charging Conductors By Induction01:15

Charging Conductors By Induction

8.4K
The Earth is a good conductor of electricity, and it is so big that it can be considered an infinite source or sink of charges. It can easily exchange charges with any matter.
Generally, conductors like metals do not allow any excess charge to be present on them. Any excess charge added to metals easily flows away, for example, when a metal is placed on the Earth. This process is called earthing.
However, conductors can be charged by a process called induction. For example, consider charging a...
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Electrolyte and Nonelectrolyte Solutions02:21

Electrolyte and Nonelectrolyte Solutions

65.6K
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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Updated: Oct 14, 2025

Synthesis of Ionic Liquid Based Electrolytes, Assembly of Li-ion Batteries, and Measurements of Performance at High Temperature
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Robust ionic liquid@MOF composite as a versatile superprotonic conductor.

Kiran Taksande1,2, Effrosyni Gkaniatsou3, Corine Simonnet-Jégat3

  • 1ICGM, University of Montpellier, CNRS, ENSCM, Montpellier, France. sabine.devautour-vinot@umontpellier.fr.

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A novel composite, EMIMCl@MIL-101(Cr)-SO3H, demonstrates exceptional proton conductivity in both dry and humid conditions. This material is a promising solid-state conductor for proton exchange membrane fuel cells (PEMFCs).

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Area of Science:

  • Materials Science
  • Electrochemistry
  • Chemical Engineering

Background:

  • Proton exchange membrane fuel cells (PEMFCs) are crucial for clean energy.
  • Developing stable and efficient proton conductors is essential for PEMFC performance.
  • Ionic liquid-in-metal-organic framework composites offer potential for enhanced conductivity.

Purpose of the Study:

  • To synthesize and characterize a novel proton conducting composite material.
  • To evaluate the proton conductivity of the composite under various conditions.
  • To assess the suitability of the composite for PEMFC applications.

Main Methods:

  • Impregnation of EMIMCl ionic liquid into MIL-101(Cr)-SO3H metal-organic framework.
  • Characterization of thermal and chemical stability.
  • Measurement of proton conductivity in anhydrous and humid environments.

Main Results:

  • The EMIMCl@MIL-101(Cr)-SO3H composite exhibited high thermal and chemical stability.
  • Excellent retention of EMIMCl was observed up to 500 K and under moisture.
  • Outstanding anhydrous proton conductivity (σ473K = 1.5 × 10⁻³ S cm⁻¹) was achieved.
  • High humidity proton conductivity (σ(343K/60%-80%RH) ≥ 0.10 S cm⁻¹) was recorded.

Conclusions:

  • EMIMCl@MIL-101(Cr)-SO3H is a highly stable and performing proton conductor.
  • The composite shows potential as a solid-state conductor for PEMFCs.
  • Its performance under versatile conditions makes it a unique candidate for fuel cell technology.