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Structures of Solids02:22

Structures of Solids

17.8K
Solids in which the atoms, ions, or molecules are arranged in a definite repeating pattern are known as crystalline solids. Metals and ionic compounds typically form ordered, crystalline solids. A crystalline solid has a precise melting temperature because each atom or molecule of the same type is held in place with the same forces or energy. Amorphous solids or non-crystalline solids (or, sometimes, glasses) which lack an ordered internal structure and are randomly arranged. Substances that...
17.8K
Ionic Crystal Structures02:42

Ionic Crystal Structures

18.0K
Ionic crystals consist of two or more different kinds of ions that usually have different sizes. The packing of these ions into a crystal structure is more complex than the packing of metal atoms that are the same size.
Most monatomic ions behave as charged spheres, and their attraction for ions of opposite charge is the same in every direction. Consequently, stable structures for ionic compounds result (1) when ions of one charge are surrounded by as many ions as possible of the opposite...
18.0K
Metallic Solids02:37

Metallic Solids

16.4K
Metallic solids such as crystals of copper, aluminum, and iron are formed by metal atoms. The structure of metallic crystals is often described as a uniform distribution of atomic nuclei within a “sea” of delocalized electrons. The atoms within such a metallic solid are held together by a unique force known as metallic bonding that gives rise to many useful and varied bulk properties.
All metallic solids exhibit high thermal and electrical conductivity, metallic luster, and...
16.4K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

13.8K
The structure of a crystalline solid, whether a metal or not, is best described by considering its simplest repeating unit, which is referred to as its unit cell. The unit cell consists of lattice points that represent the locations of atoms or ions. The entire structure then consists of this unit cell repeating in three dimensions. The three different types of unit cells present in the cubic lattice are illustrated in Figure 1.
Types of Unit Cells
Imagine taking a large number of identical...
13.8K

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Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
07:44

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

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バイナリナノ粒子超網における構造的多様性

Elena V Shevchenko1, Dmitri V Talapin, Nicholas A Kotov

  • 1IBM Research Division, T. J. Watson Research Center, 1101 Kitchawan Road, Yorktown Heights, New York 10598, USA.

Nature
|January 7, 2006
PubMed
まとめ
この要約は機械生成です。

科学者たちは様々なナノ粒子を二重ナノ粒子のスーパーラット (BNSL) に組み立てました. このボトムアップのアプローチは,調整可能な性質を持つ新しいメタマテリアルを作り,材料科学の可能性を広げます.

さらに関連する動画

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

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Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles
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Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles

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関連する実験動画

Last Updated: May 3, 2026

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems
07:44

Resonance Raman Spectroscopy of Extreme Nanowires and Other 1D Systems

Published on: April 28, 2016

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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

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Liquid-cell Transmission Electron Microscopy for Tracking Self-assembly of Nanoparticles
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科学分野:

  • 材料科学 材料科学とは
  • ナノテクノロジー ナノテクノロジー
  • 化学 化学は化学です.

背景:

  • 構成要素 (原子,分子,ナノ粒子) のボトムアップアセンブリは,科学において極めて重要です.
  • ナノ粒子の自己組み立ては,リトグラフィック技術を上回る精度を提供します.
  • バイナリナノ粒子超網 (BNSL) は,構成と構成要素の配置を制御した費用対効果の高いメタマテリアルを約束します.

研究 の 目的:

  • 多様なBNSL構造の形成を調査する.
  • BNSLの形成の背後にある原動力を調査する.
  • 新種のメタマテリアルを作るための多用途な方法を実証する.

主な方法:

  • 半導体,金属,磁性ナノ粒子構成要素の組み合わせを使用した.
  • 制御された電荷を持つステリカルに安定したナノ粒子を使用しました.
  • 構造安定化に対する様々な力 (エントロピー,ヴァン・デル・ワールス力,ステリック力,二極力) の貢献を分析した.

主要な成果:

  • 15以上の異なるBNSL構造を成功裏に形成しました.
  • これまでに文書化されていない少なくとも10のコロイド結晶構造が報告されています.
  • ナノ粒子の電荷がBNSLステキオメトリを決定することを実証した.

結論:

  • ナノ粒子の電荷は,BNSLステキオメトリーの鍵です.
  • 力の組み合わせは,BNSLの構造の幅広い範囲を安定させます.
  • この研究は,アクセス可能なBNSL構造とメタマテリアルのライブラリを拡張します.