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関連する概念動画

Valence Bond Theory02:42

Valence Bond Theory

11.1K
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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Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)

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Two NMR-active nuclei bonded to a central atom can be involved in geminal or two-bond coupling. Geminal coupling is commonly seen between diastereotopic protons in chiral molecules and unsymmetrical alkenes, among others.
The central atom need not be NMR-active because its electrons are affected by the electron polarization of the spin-active atoms. However, spin information is transmitted less effectively than in one-bond coupling, and 2J values are usually weaker than 1J values. The energy of...
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Atomic Nuclei: Nuclear Spin State Overview01:03

Atomic Nuclei: Nuclear Spin State Overview

1.9K
NMR-active nuclei have energy levels called 'spin states' that are associated with the orientations of their nuclear magnetic moments. In the absence of a magnetic field, the nuclear magnetic moments are randomly oriented, and the spin states are degenerate. When an external magnetic field is applied, the spin states have only 2 + 1 orientations available to them. A proton with = ½ has two available orientations. Similarly, for a quadrupolar nucleus with a nuclear spin value of one, the...
1.9K
Ferromagnetism01:31

Ferromagnetism

2.9K
Materials like iron, nickel, and cobalt consist of magnetic domains, within which the magnetic dipoles are arranged parallel to each other. The magnetic dipoles are rigidly aligned in the same direction within a domain by quantum mechanical coupling among the atoms. This coupling is so strong that even thermal agitation at room temperature cannot break it. The result is that each domain has a net dipole moment. However, some materials have weaker coupling, and are ferromagnetic at lower...
2.9K
Atomic Nuclei: Nuclear Spin01:08

Atomic Nuclei: Nuclear Spin

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All atomic particles possess an intrinsic angular momentum, or 'spin'. Electrons, protons, and neutrons each have a spin value of ½, although protons and neutrons in nuclei may have higher half-integer spins owing to energetic factors.
Atomic nuclei have a net nuclear spin, , which can have an integer or half-integer value. In atomic nuclei, the spins of protons are paired against each other but not with neutrons, and vice versa. Consequently, an even number of protons does not contribute to...
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Diamagnetism01:26

Diamagnetism

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Materials consisting of paired electrons have zero net magnetic moments. However, when these materials are placed under an external magnetic field, the moments opposite to the field are induced. Such materials are called diamagnets. Diamagnetism is the response of the diamagnets when placed in an external magnetic field.
Diamagnetism was discovered by Anton Brugmans in 1778 when he observed that bismuth gets repelled by magnetic fields, thus theorizing that diamagnets get repelled by magnets....
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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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電気触媒のためのスピン極化非鉄磁面:化学スピントロニクス

Hansaem Jang1, Daniel Roe2, Harry E Taylor3

  • 1Department of Chemistry and Stephenson Institute for Renewable Energy, University of Liverpool, Liverpool L69 7ZF, U.K.

Journal of the American Chemical Society
|December 19, 2025
PubMed
まとめ

研究者は 金やプラチナのような非磁性金属に 調節可能な電解活性を示しています この近接誘導磁気アプローチは,水素進化のような反応のための伝統的な触媒の制限を克服します.

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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope

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Experimental Methods for Spin- and Angle-Resolved Photoemission Spectroscopy Combined with Polarization-Variable Laser
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Electrospinning of Photocatalytic Electrodes for Dye-sensitized Solar Cells
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Visualizing Uniaxial-strain Manipulation of Antiferromagnetic Domains in Fe1+YTe Using a Spin-polarized Scanning Tunneling Microscope
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科学分野:

  • 材料科学
  • 電気化学
  • カタリシス
  • スピントロニクス

背景:

  • 触媒の性能は,中間結合エネルギー間のスケーリング関係によってしばしば制限されます.
  • これらの制約を克服するための既存の方法は,しばしば無効です.
  • 磁気材料は吸収エネルギーを変化させるが,その適用は制限されている.

研究 の 目的:

  • 近接誘導磁気を用いた非磁性金属の調節可能な電解活性を調査する.
  • カタリシスにおけるスケーリング関係を克服するための新しいアプローチを探求する.
  • 触媒応用におけるスピントロニクスベースの構造の有用性を実証する.

主な方法:

  • 鉄磁性 (CoB) 層と非磁性 (Au,Pt) 層の多層電極の製造
  • 水素進化反応 (HER) の電気化学的測定
  • カプリング層の厚さと磁場に対する触媒電流の依存性の分析.
  • 密度関数理論 (DFT) のシミュレーション

主要な成果:

  • 調節可能なHER電解活性が,基底にあるCoBフェロマグネットを使用して,AuとPtで達成されました.
  • マグネトヒドロダイナミック効果ではなく,近接誘発磁気 (PIM) がメカニズムとして特定されました.
  • DFTは,Tafel HERメカニズムのスケーリング関係が破られたことを確認しました.
  • 薄膜スピントロニック構造は,非磁性金属におけるスピン極化触媒を可能にします.

結論:

  • 近接誘導磁気は,非磁性金属の電触媒を強化する多用途の戦略を提供します.
  • スピントロニクス製造技術は,高度な触媒を開発するためのプラットフォームを提供します.
  • この研究は,スピン効果を活用して,触媒設計の新たな道を開きます.