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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...
Coordination Number and Geometry02:57

Coordination Number and Geometry

For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
Five-Membered Heterocyclic Aromatic Compounds: Overview01:13

Five-Membered Heterocyclic Aromatic Compounds: Overview

Heterocyclic aromatic compounds are cyclic compounds that are aromatic and have one or more heteroatoms—atoms other than carbon, in the ring. Depending upon the number of atoms present in the ring, they can be either five or six-membered. Examples of five-membered heterocyclic aromatic compounds include pyrrole, furan, thiophene, and imidazole. Pyrrole consists of one nitrogen atom having one lone pair of electrons. Furan and thiophene have one oxygen and one sulfur heteroatom, respectively.
Structure of Benzene: Molecular Orbital Model01:18

Structure of Benzene: Molecular Orbital Model

According to the molecular orbital (MO) model, benzene has a planar structure with a regular hexagon of six sp2 hybridized carbons. As shown in Figure 1, each carbon is bonded to three other atoms with C–C–C and H–C–C bond angles of 120°. The C–H bond length is 109 pm, and the C–C bond length is 139 pm which is midway between the single bond length of sp3 hybridized carbons (154 pm) and sp2 hybridized carbons (133 pm).
Aromatic Hydrocarbon Cations: Structural Overview01:18

Aromatic Hydrocarbon Cations: Structural Overview

Cycloheptatriene is a neutral monocyclic unsaturated hydrocarbon that consists of an odd number of carbon atoms and an intervening sp3 carbon in the ring. The three double bonds in the ring correspond to 6 π electrons, which is a Huckel number, and therefore satisfies the criteria of 4n + 2 π electrons. However, the intervening sp3 carbon disrupts the continuous overlap of p orbitals. As a result, cycloheptatriene is not aromatic.
Removing one hydrogen from the intervening CH2 group with both...
VSEPR Theory and the Effect of Lone Pairs04:01

VSEPR Theory and the Effect of Lone Pairs

Effect of Lone Pairs of Electrons on Molecule Geometry

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関連する実験動画

Updated: May 10, 2026

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

六角形のグラフェンオニオンリング

Zheng Yan1, Yuanyue Liu, Jian Lin

  • 1Department of Chemistry, Rice University, 6100 Main Street, Houston, Texas 77005, USA.

Journal of the American Chemical Society
|July 3, 2013
PubMed
まとめ
この要約は機械生成です。

研究者は,2D成長の限界を克服し,3Dグラフェン構造を合成するための新しい方法を開発しました. このブレークスルーにより,グラフェンリボンを使用した先進的な材料やデバイスの新たな可能性が生まれます.

さらに関連する動画

Preparation and Characterization of C60/Graphene Hybrid Nanostructures
08:40

Preparation and Characterization of C60/Graphene Hybrid Nanostructures

Published on: May 15, 2018

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
08:18

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry

Published on: March 4, 2021

関連する実験動画

Last Updated: May 10, 2026

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

Preparation and Characterization of C60/Graphene Hybrid Nanostructures
08:40

Preparation and Characterization of C60/Graphene Hybrid Nanostructures

Published on: May 15, 2018

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry
08:18

Microscopic Visualization of Porous Nanographenes Synthesized through a Combination of Solution and On-Surface Chemistry

Published on: March 4, 2021

科学分野:

  • 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
  • 化学 化学は化学です.

背景:

  • 材料の精密な空間的制御は,材料の性質を設計する上で極めて重要です.
  • 銅の上のグラフェン合成は,典型的には2Dの成長をもたらし,複雑な構造を制限します.

研究 の 目的:

  • 3次元 (3D) のオニオンリングのようなグラフェン構造の成長を報告する.
  • 3D空間構造のための新しいグラフェン核形成機構を明らかにする.

主な方法:

  • Cu基板の3Dグラフェン構造の成長.
  • エッジ核と3D成長のための水素化を活用する.
  • 提案されたメカニズムをサポートする最初の原則の計算.

主要な成果:

  • コンセントリック六角形グラフェンリボンリングからなる3Dグラフェン構造を成功裏に合成した.
  • 水素化誘発のエッジ核化と新しいグラフェン層の3D成長が実証されました.
  • ナノリボン製造とリチウム貯蔵の可能性を特定しました.

結論:

  • この研究は,3D成長を可能にする新しいグラフェン核形成機構を明らかにしています.
  • この発見は,グラフェンや他の2D素材の新しい3D空間構造を設計するための道を開く.
  • 実証された特徴は,ナノテクノロジーとエネルギー貯蔵における潜在的な応用を提供します.