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Spin–Spin Coupling Constant: Overview01:08

Spin–Spin Coupling Constant: Overview

1.1K
In bromoethane, the three methyl protons are coupled to the two methylene protons that are three bonds away. In accordance with the n+1 rule, the signal from the methyl protons is split into three peaks with 1:2:1 relative intensities. The methylene protons appear as a quartet, with the relative intensities of 1:3:3:1.
Qualitatively, any spin plus-half nucleus polarizes the spins of its electrons to the minus-half state. Consequently, the paired electron in the hydrogen–carbon bond must...
1.1K
Angle of Twist: Problem Solving01:13

Angle of Twist: Problem Solving

448
An electric motor applies a torque of 700 N·m to an aluminum shaft, triggering a stable rotation. Two pulleys, B and C, are subjected to torques of 300 N·m and 400 N·m, respectively. The modulus of rigidity is provided as 25 GPa. With the knowledge of the length and diameter of each segment, the twist angle between the two pulleys can be computed. First, a section cut is made between pulleys B and C, and the cut cross-section is analyzed using a free-body diagram. Given that the...
448
Spin–Spin Coupling: One-Bond Coupling01:17

Spin–Spin Coupling: One-Bond Coupling

1.1K
Coupling interactions are strongest between NMR-active nuclei bonded to each other, where spin information can be transmitted directly through the pair of bonding electrons. While nuclei polarize their electrons to the opposite spins, the bonding electron pair has opposite spins. Configurations with antiparallel nuclear spins are expected to be lower in energy. When coupling makes antiparallel states more favorable, J is considered to have a positive value. The one-bond coupling constant, 1J,...
1.1K
Mechanisms of Membrane-bending01:15

Mechanisms of Membrane-bending

2.9K
The living membranes are flexible due to their fluid mosaic nature; however, their bending into different shapes is an active process regulated by specific lipids and proteins. The membrane bending can be transient as seen in vesicles or stable for a long time as in microvilli. Cells regulate the size, location, and duration of the membrane curvature.
Membrane bending can happen due to intrinsic changes in lipid composition or extrinsic association with different proteins. The proteins involved...
2.9K
Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)01:22

Spin–Spin Coupling: Three-Bond Coupling (Vicinal Coupling)

1.2K
Vicinal or three-bond coupling is commonly observed between protons attached to adjacent carbons. Here, nuclear spin information is primarily transferred via electron spin interactions between adjacent C‑H bond orbitals. This generally favors the antiparallel arrangement of spins, so 3J values are usually positive.
The extent of coupling depends on the C‑C bond length, the two H‑C‑C angles, any electron-withdrawing substituents, and the dihedral angle between the...
1.2K
Spin–Spin Coupling: Two-Bond Coupling (Geminal Coupling)01:20

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

1.2K
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...
1.2K

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Advanced Experimental Methods for Low-temperature Magnetotransport Measurement of Novel Materials
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スピントロニクスを変えて

Jose L Lado1

  • 1Department of Applied Physics, Aalto University, 00076 Aalto, Espoo, Finland.

Science (New York, N.Y.)
|November 25, 2021
PubMed
まとめ
この要約は機械生成です。

ヴァン・デル・ワールズの材料のモアールパターンは,高度な磁気構造を設計するための新しい経路を提供します. この研究で,これらのパターンが磁気特性を正確に制御する可能性を調査しています.

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Fabrication of Spatially Confined Complex Oxides
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科学分野:

  • 凝縮物質物理学
  • 材料科学
  • ナノテクノロジー

背景:

  • ヴァン・ダー・ワールズの材料は スタックされたときに 独特の電子と磁気特性を表します
  • モイレパターンは,積み重ねられた2D材料の格子不一致から生じ,周期的な潜在的変化を生じます.

研究 の 目的:

  • 調節可能な磁気構造の設計のためのヴァン・ダー・ワールスのヘテロ構造のモーレパターンの利用を調査する.
  • モイレ超網のパラメータと新興磁気現象の関係を探る.

主な方法:

  • 制御された回転角度を持つヴァン・デル・ワールスのヘテロ構造の製造.
  • スキャントンネル顕微鏡や磁力顕微鏡などの技術を用いて構造的および磁性特性の特徴づけ
  • モイレ超網内の電子と磁気相互作用を理解するための理論モデルです.

主要な成果:

  • モイレパターン工学による磁気配列とドメイン構造の制御を証明した.
  • モイレ周期性による調節可能な磁性アニソトロピーと相変遷を観測した.
  • 望ましい磁気機能を促進する特定のモーレ超網構造を特定した.

結論:

  • ヴァン・デル・ワールズの材料のモアールパターンは,ナノスケールの磁気特性を設計し制御するための強力なプラットフォームを提供します.
  • このアプローチは,新しい磁気装置を作り, 工学的材料の基本的な物理学を探求するための新しい道を開きます.