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関連する概念動画

Metallic Solids02:37

Metallic Solids

19.8K
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....
19.8K
Structures of Solids02:22

Structures of Solids

16.5K
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...
16.5K
Trends in Lattice Energy: Ion Size and Charge02:54

Trends in Lattice Energy: Ion Size and Charge

25.7K
An ionic compound is stable because of the electrostatic attraction between its positive and negative ions. The lattice energy of a compound is a measure of the strength of this attraction. The lattice energy (ΔHlattice) of an ionic compound is defined as the energy required to separate one mole of the solid into its component gaseous ions. For the ionic solid sodium chloride, the lattice energy is the enthalpy change of the process:
25.7K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

10.6K
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...
10.6K
Network Covalent Solids02:18

Network Covalent Solids

15.3K
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...
15.3K
Ionic Crystal Structures02:42

Ionic Crystal Structures

16.0K
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...
16.0K

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Updated: Nov 7, 2025

Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials
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Residue-Free Fabrication of van der Waals Heterostructures of Two-Dimensional Materials

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一次元超格子ヘテロ構造ライブラリ

Yi Li1, Chong Zhang1, Tao-Tao Zhuang1

  • 1Division of Nanomaterials and Chemistry, Hefei National Laboratory for Physical Sciences at the Microscale, Institute of Energy, Hefei Comprehensive National Science Center, CAS Center for Excellence in Nanoscience, Department of Chemistry, Institute of Biomimetic Materials and Chemistry, Anhui Engineering Laboratory of Biomimetic Materials, University of Science and Technology of China, Hefei, Anhui 230026, China.

Journal of the American Chemical Society
|April 30, 2021
PubMed
まとめ
この要約は機械生成です。

研究者らは,軸性超網ナノワイヤ (ASLNWs) を正確に合成する新しい方法を開発した. この画期的な発見により 太陽エネルギー変換と 光触媒による水素の生産が強化され,先進的な光電子技術への道が開けました

さらに関連する動画

Optimized Fabrication Procedure for High-Quality Graphene-based Moir&#233; Superlattice Devices
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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関連する実験動画

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Optimized Fabrication Procedure for High-Quality Graphene-based Moir&#233; Superlattice Devices
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • 再生可能エネルギー

背景:

  • 軸性超網ナノワイヤ (ASLNWs) は,調整可能な特性により,光電子と太陽光から燃料への変換の可能性を秘めています.
  • 制御された組成と構造を持つASLNWの高精度の合成は決定的ですが,挑戦的です.

研究 の 目的:

  • ASLNW のための一般的で高精度の合成方法論を開発する.
  • プログラム可能な構成,次元,結晶相,インターフェース,周期性を持つASLNWsのライブラリを作成します.
  • これらのASLNWの太陽光エネルギーアプリケーションの性能を向上させることを示します.

主な方法:

  • 前もって設計された,編集可能なナノ粒子フレームワークを使用した軸性エンコーディング方法が採用されました.
  • ASLNWs内の隣接するサブオブジェクトの化学解離は,制御された合成を可能にしました.
  • プラズモニック,金属,近赤外線活性カルコゲニド成分をASLNWに統合する.

主要な成果:

  • 構造と組成のパラメータを正確に制御する異なるASLNWのライブラリが成功裏に合成されました.
  • プラズモニック,金属,またはカルコゲニド成分を組み込んだASLNWが製造された.
  • 最適化されたASLNWは,個々のコンポーネントと比較して,光触媒的水素生成率を数桁向上させました.

結論:

  • 開発された軸のエンコーディング方法論は,ASLNW合成の正確な制御を提供します.
  • この進歩は,特に光触媒による水素生産における太陽エネルギー変換アプリケーションの性能を大幅に向上させます.
  • 合成されたASLNWは,新しい現象と先進的な光電子装置を約束します.