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関連する概念動画

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...
Energy Bands in Solids01:01

Energy Bands in Solids

Isolated atoms have discrete energy levels that are well described by the Bohr model. And, it quantifies the energy of an electron in a hydrogen atom as En. Higher quantum numbers 'n' yield less negative, closer electron energy levels.
 Band Formation:
When atoms are brought close together, as in a solid, these discrete energy levels begin to split due to the overlap of electron orbitals from adjacent atoms. This split occurs because of the Pauli exclusion principle, which states that no two...
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

Crystalline solids are divided into four types: molecular, ionic, metallic, and covalent network based on the type of constituent units and their interparticle interactions.
Molecular Solids
Molecular crystalline solids, such as ice, sucrose (table sugar), and iodine, are solids that are composed of neutral molecules as their constituent units. These molecules are held together by weak intermolecular forces such as London dispersion forces, dipole-dipole interactions, or hydrogen bonds, which...
Metallic Solids02:37

Metallic Solids

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 malleability. Many...
Structures of Solids02:22

Structures of Solids

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...
Electronic Structure of Atoms02:28

Electronic Structure of Atoms


An atom comprises protons and neutrons, which are contained inside the dense, central core called the nucleus, with electrons present around the nucleus. Taking into account the wave–particle duality of electrons and the uncertainty in position around the nucleus, quantum mechanics provides a more accurate model for the atomic structure. It describes atomic orbitals as the regions around the nucleus where electrons of discrete energy exist, characterized by four quantum numbers:  n, l, ml, and...

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Updated: May 10, 2026

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

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

Published on: September 17, 2017

固体化学におけるナノスケールの原子

Xavier Roy1, Chul-Ho Lee, Andrew C Crowther

  • 1Department of Chemistry, Columbia University, New York, NY 10027, USA.

Science (New York, N.Y.)
|June 8, 2013
PubMed
まとめ
この要約は機械生成です。

原子的に正確な分子クラスターは,独自の電子および磁気特性を有する新しい固体材料に自己組み立てます. これらの高度な材料は,活性化された電子輸送と磁気オーダーリングを示し,新しい電子アプリケーションの道を開く.

さらに関連する動画

Atomically Traceable Nanostructure Fabrication
12:35

Atomically Traceable Nanostructure Fabrication

Published on: July 17, 2015

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

関連する実験動画

Last Updated: May 10, 2026

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
14:55

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

Published on: September 17, 2017

Atomically Traceable Nanostructure Fabrication
12:35

Atomically Traceable Nanostructure Fabrication

Published on: July 17, 2015

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics
11:33

All-electronic Nanosecond-resolved Scanning Tunneling Microscopy: Facilitating the Investigation of Single Dopant Charge Dynamics

Published on: January 19, 2018

科学分野:

  • 固体化学 固体化学
  • 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:

  • 原子的に正確な分子クラスターは,新しい材料のための構成要素を提供します.
  • フラーレンは,超分子化学における多用途な成分である.
  • クラスターアセンブリにおける構造-プロパティ関係を理解することは極めて重要です.

研究 の 目的:

  • 分子クラスターとフルレノのバイナリ・アセンブリから新しい固体物質を合成し,特徴づけること.
  • これらの新しい材料の電子輸送特性を調査する.
  • クラスターベースの固体化合物の磁気特性を探求する.

主な方法:

  • 分子クラスターのバイナリ・アセンブリ (例えば,[Co6Se8(PEt3) 6],[Cr6Te8(PEt3) 6],Ni9Te6(PEt3) 8) とフラーレン (C60) を組み合わせたものです.
  • カドミウムヨウ酸化物 (CdI2) と岩塩構造の超原子的な親族を含む結晶構造を決定するためのX線 difraktion.
  • アクティベーションエネルギーを決定するために,電子伝送特性の測定.
  • 磁気順序を特定するための磁気感受性測定.

主要な成果:

  • [Co6Se8(PEt3) [6][C60]2と[Cr6Te8(PEt3) [6][C60]2の形成により,超原子CdI2型構造が形成される.
  • 100-150 meVの活性化エネルギーを持つこれらの材料における活性化された電子輸送の観測.
  • より還元性のあるNi9Te6 (((PEt3) 8クラスタを使用した岩塩関連構造の合成で,C60.0.に有意な電荷移転を示しています.
  • クラスター間の電子相互作用によるNi9Te6(PEt3) 8ベースの材料の低温での磁気的に秩序付けられた相の発見.

結論:

  • 原子的に正確な分子クラスターは,フルレンで二重組成され,新しい固体材料を作成することができます.
  • これらの材料は,調節可能な電子伝送と磁気特性を有しています.
  • オーダーされた構造を形成し,磁性オーダーリングのような現象を現す能力は,高度なアプリケーションにおけるクラスターベースの材料の可能性を強調しています.