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Related Concept Videos

Superconductor01:24

Superconductor

1.9K
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...
1.9K
Types Of Superconductors01:28

Types Of Superconductors

1.7K
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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Preparation and Reactions of Sulfides02:26

Preparation and Reactions of Sulfides

5.9K
Sulfides are the sulfur analog of ethers, just as thiols are the sulfur analog of alcohol. Like ethers, sulfides also consist of two hydrocarbon groups bonded to the central sulfur atom. Depending upon the type of groups present, sulfides can be symmetrical or asymmetrical. Symmetrical sulfides can be prepared via an SN2 reaction between 2 equivalents of an alkyl halide and one equivalent of sodium sulfide.
5.9K
Hydrogen Bonds00:26

Hydrogen Bonds

135.0K
Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
135.0K
Hydrogen Bonds01:04

Hydrogen Bonds

15.3K
A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
15.3K
2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)01:19

2D NMR: Heteronuclear Single-Quantum Correlation Spectroscopy (HSQC)

1.5K
Heteronuclear single-quantum correlation spectroscopy (HSQC) is a 2D NMR technique that reveals one-bond correlations between hydrogen and a heteronucleus. The HSQC experiment is similar to the heteronuclear correlation experiment (HETCOR) but is more sensitive. In the HSQC spectrum, the proton chemical shift is plotted on the horizontal F2 axis, while the 13C chemical shift is plotted on the vertical F1 axis. The corresponding proton and 13C spectra are also shown. The HSQC contour plot does...
1.5K

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A Sensitive Visual Method for the Detection of Hydrogen Sulfide Producing Bacteria
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Superconducting Hydrogen Sulfide.

Yansun Yao1,2, John S Tse1

  • 1Department of Physics and Engineering Physics, University of Saskatchewan, Saskatoon, Saskatchewan, S7N 5E2, Canada.

Chemistry (Weinheim an Der Bergstrasse, Germany)
|December 6, 2017
PubMed
Summary
This summary is machine-generated.

Superconductivity above 200 Kelvin was discovered in hydrogen sulfide under high pressure, a significant breakthrough. This conventional, phonon-mediated superconductor achieved a record critical temperature, exceeding previous records by over 50 Kelvin.

Keywords:
high pressurehydrogensulfidesulfursuperconducting

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Area of Science:

  • Materials Science
  • Condensed Matter Physics
  • Chemistry

Background:

  • Superconductivity research aims to achieve higher critical temperatures (Tc).
  • Conventional superconductors are typically limited to very low temperatures.
  • High-pressure research has yielded novel superconducting materials.

Purpose of the Study:

  • To review the recent advancements in understanding high-temperature superconductivity in hydrogen sulfide.
  • To discuss the theoretical predictions and experimental verification of this novel superconductor.
  • To highlight unsolved problems and future research directions.

Main Methods:

  • High-pressure synthesis and characterization techniques.
  • Theoretical calculations predicting superconducting properties.
  • Experimental verification of superconductivity and its mechanism.

Main Results:

  • Discovery of superconductivity in hydrogen sulfide above 200 K under high pressure.
  • Demonstration of a conventional, phonon-mediated mechanism for this high-Tc superconductivity.
  • Confirmation of a superconductor predicted first by theory and later verified experimentally.

Conclusions:

  • Hydrogen sulfide represents a milestone in high-temperature superconductivity.
  • The findings validate the power of theoretical prediction in materials discovery.
  • Further research is needed to explore the full potential and underlying physics of this material.