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関連する概念動画

Dynamic Equilibrium02:20

Dynamic Equilibrium

A reversible chemical reaction represents a chemical process that proceeds in both forward (left to right) and reverse (right to left) directions. When the rates of the forward and reverse reactions are equal, the concentrations of the reactant and product species remain constant over time and the system is at equilibrium. A special double arrow is used to emphasize the reversible nature of the reaction. The relative concentrations of reactants and products in equilibrium systems vary greatly;...
Protein Dynamics in Living Cells01:19

Protein Dynamics in Living Cells

Different fluorescence-based techniques are used to study the protein dynamics in living cells. These techniques include FRAP, FRET, and PET.
Fluorescent recovery after photobleaching (FRAP) is a fluorescent-protein-based detection technique used to quantify protein movement rates within the cell. This method exposes a small portion of the cell to an intense laser beam. The laser beam causes permanent photobleaching of the fluorophore-tagged proteins in the exposed region. As the bleached...
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...
Semiconductors01:22

Semiconductors

There is variation in the electrical conductivity of materials - metals, semiconductors, and insulators that are showcased with the help of the energy band diagrams.
Metals such as copper (Cu), zinc (Zn), or lead (Pb) have low resistivity and feature conduction bands that are either not fully occupied or overlap with the valence band, making a bandgap non-existent. This allows electrons in the highest energy levels of the valence band to easily transition to the conduction band upon gaining...
Metal-Semiconductor Junctions01:24

Metal-Semiconductor Junctions

The contact of metal and semiconductor can lead to the formation of a junction with either Schottky or Ohmic behavior.
Schottky Barriers
Schottky barriers arise when a metal with a work function (Φm) contacts a semiconductor with a different work function (Φs). Initially, electrons transfer until the Fermi levels of the metal and semiconductor align at equilibrium. For instance, if Φm > Φs, the semiconductor Fermi level is higher than the metal's before contact. The semiconductor's...
Determination of Crystal Structures01:29

Determination of Crystal Structures

In the late 1800s, the revelation that light extended beyond visible wavelengths led to the discovery of X-rays by Wilhelm Roentgen. Recognized as high-energy electromagnetic radiation with short wavelengths, X-rays prompted exploration into their interaction with crystals. Max von Laue proposed in 1912 that the periodic arrangement of atoms, ions, or molecules in crystals would cause them to diffract X-rays, a hypothesis confirmed through experiments with copper sulfate and zinc sulfide...

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関連する実験動画

Updated: Jun 30, 2026

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
06:26

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

コロイド結晶における変位ダイナミクスの可視化

Peter Schall1, Itai Cohen, David A Weitz

  • 1Division of Engineering and Applied Sciences, Harvard University, 9 Oxford Street, Cambridge, MA 02138, USA. pschall@deas.harvard.edu

Science (New York, N.Y.)
|September 28, 2004
PubMed
まとめ
この要約は機械生成です。

動位,原子結晶の微分に不可欠な線形欠陥は,現在,コロイド結晶で観察できる. この研究は,それらの運動と行動を詳細に説明し,原子系とコロイド系の両方に適用可能な洞察を明らかにします.

さらに関連する動画

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
10:35

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

関連する実験動画

Last Updated: Jun 30, 2026

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
06:26

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets

Published on: May 15, 2017

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals
10:35

Novel Techniques for Observing Structural Dynamics of Photoresponsive Liquid Crystals

Published on: May 29, 2018

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal
06:24

High-Contrast and Fast Photorheological Switching of a Twist-Bend Nematic Liquid Crystal

Published on: October 31, 2019

科学分野:

  • 凝縮物質物理学 凝縮物質物理学
  • マテリアルサイエンス 材料科学
  • ナノテクノロジー ナノテクノロジー

背景:

  • 脱位運動は,原子結晶における不可逆的なストレスの主要なメカニズムである.
  • 変位を理解することは,物質の性質と行動を制御する上で鍵となる.

研究 の 目的:

  • 張力のあるコロイド結晶における脱位運動を調査する.
  • これらのシステムの変位のトポロジーと伝播を特徴付ける.
  • 原子結晶とコロイド結晶の脱位行動を比較するために.

主な方法:

  • レーザー屈折顕微鏡を用いて,不適合変位の成長と構造を研究した.
  • 単粒子レベルの詳細を特定するために,レーザースキャニング共焦点顕微鏡を使用しました.
  • 様々な長さスケールでの変位を分析するための組み合わせた技術.

主要な成果:

  • コロイド結晶フィルムにおける,観察された,詳細な変位運動.
  • 決定された臨界膜の厚さ,脱位密度,バーガーズベクトル,格子抵抗.
  • ゼロエネルギー・スタッキング・フォールの境界を定めるショックリー・パーシャルとして変位を特定した.
  • 発見された変位の行動は,原子結晶に使用される連続体理論と一致しています.

結論:

  • コロイド結晶は,変位ダイナミクスを研究するための新しいプラットフォームを提供します.
  • コロイド結晶の変位行動は,小さなスケールでも,原子結晶の変位を反映しています.
  • 連続体理論は,コロイド系における脱位メカニズムを効果的に記述する.