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関連する概念動画

Stability of Equilibrium Configuration01:23

Stability of Equilibrium Configuration

Understanding the stability of equilibrium configurations is a fundamental part of mechanical engineering. In any system, there are three distinct types of equilibrium: stable, neutral, and unstable.
A stable equilibrium occurs when a system tends to return to its original position when given a small displacement, and the potential energy is at its minimum. An example of a stable equilibrium is when a cantilever beam is fixed at one end and a weight is attached to the other end. If the weight...
Microtubule Instability02:17

Microtubule Instability

Microtubules are hollow cylindrical filaments having a diameter of approximately 25 nm and a length that varies from 200 nm to 25 μm. GTP-bound tubulin subunits form αβ-heterodimers for microtubule assembly. These core building blocks interact longitudinally, polymerizing into protofilaments. The protofilaments then interact with one another through lateral bonding forces to form stable cylindrical microtubules. These cylindrical filaments are dynamic as they undergo repeated assembly and...
Stability of structures01:14

Stability of structures

In mechanical engineering, the stability of systems under various forces is critical for designing durable and efficient structures. One fundamental way to explore these concepts is by analyzing systems like two rods connected at a pivot point, O, with a torsional spring of spring constant k at the pivot point. This system is similar in appearance to a scissor jack used to change tires on a car. In this case, the arms of the linkage (equivalent to the rods in this system) are entirely vertical,...
Network Covalent Solids02:18

Network Covalent Solids

Network covalent solids contain a three-dimensional network of covalently bonded atoms as found in the crystal structures of nonmetals like diamond, graphite, silicon, and some covalent compounds, such as silicon dioxide (sand) and silicon carbide (carborundum, the abrasive on sandpaper). Many minerals have networks of covalent bonds.
To break or to melt a covalent network solid, covalent bonds must be broken. Because covalent bonds are relatively strong, covalent network solids are typically...
Fermi Level Dynamics01:12

Fermi Level Dynamics

The vacuum level denotes the energy threshold required for an electron to escape from a material surface. It is usually positioned above the conduction band of a semiconductor and acts as a benchmark for comparing electron energies within various materials.
Electron affinity in semiconductors refers to the energy gap between the minimum of its conduction band and the vacuum level and it is a critical parameter in determining how easily a semiconductor can accept additional electrons.
The work...
Stability of Conjugated Dienes01:28

Stability of Conjugated Dienes

Introduction
A comparison of the enthalpies of hydrogenation of dienes reveals that conjugated dienes release less heat on hydrogenation, rendering them more stable than their nonconjugated analogs.

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関連する実験動画

Updated: Jun 24, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
11:42

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

縁のグラフェン:安定性とダイナミクス

Caglar O Girit1, Jannik C Meyer, Rolf Erni

  • 1Department of Physics, University of California at Berkeley, Berkeley, CA 94720, USA.

Science (New York, N.Y.)
|March 28, 2009
PubMed
まとめ

科学者たちは,リアルタイム映画で,個々の炭素原子がグラフェンの穴の端で動いていることを直接観察しました. この画期的な研究は,このユニークな低次元のインターフェイスで原子の再配置と放出ダイナミクスを明らかにします.

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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
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Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

Published on: September 23, 2018

Synthesis of Graphene Nanofluids with Controllable Flake Size Distributions
07:32

Synthesis of Graphene Nanofluids with Controllable Flake Size Distributions

Published on: July 17, 2019

関連する実験動画

Last Updated: Jun 24, 2026

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities
11:42

Fabrication of Gate-tunable Graphene Devices for Scanning Tunneling Microscopy Studies with Coulomb Impurities

Published on: July 24, 2015

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding
14:52

Fabrication of Three-Dimensional Graphene-Based Polyhedrons via Origami-Like Self-Folding

Published on: September 23, 2018

Synthesis of Graphene Nanofluids with Controllable Flake Size Distributions
07:32

Synthesis of Graphene Nanofluids with Controllable Flake Size Distributions

Published on: July 17, 2019

科学分野:

  • マテリアルサイエンス 材料科学
  • 表面物理学 表面物理学について
  • ナノテクノロジー ナノテクノロジー

背景:

  • 表面と縁の物質物理に関する広範な研究が存在します.
  • 孤立した辺の個々の原子の動きをリアルタイムで直接観察することは,依然として課題です.

研究 の 目的:

  • グラフェンの穴の端にある個々の炭素原子のリアルタイムダイナミクスを直接観察し記録する.
  • 低次元のインターフェースでのエッジ再構築と原子の振る舞いのメカニズムを調査する.

主な方法:

  • 同時に原子空間と1秒間の時間解像度を持つ伝送電子偏差修正顕微鏡を使用しました.
  • グラフェンホールの端にある原子の動きをリアルタイムで捉える映画を作成しました.

主要な成果:

  • 穴が膨張するにつれて,炭素-炭素結合の再配置と炭素原子のビーム誘発の放出を記録した.
  • "ジグザグ"のエッジ構成の安定性を実証しました.
  • グラフェンホールの境界で複雑な原子の振る舞いを観測した.

結論:

  • この研究は,孤立したグラフェンエッジにおける個々の原子のダイナミクスの最初の直接的なリアルタイム観測を提供します.
  • この発見は,低次元のインターフェイスにおける原子の振る舞いを支配する基本的な物理学の洞察を提供します.
  • "ジグザグ"のエッジ構成は,安定した構造として確認されました.