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関連する概念動画

Third Law of Thermodynamics02:38

Third Law of Thermodynamics

18.9K
A pure, perfectly crystalline solid possessing no kinetic energy (that is, at a temperature of absolute zero, 0 K) may be described by a single microstate, as its purity, perfect crystallinity,and complete lack of motion means there is but one possible location for each identical atom or molecule comprising the crystal (W = 1). According to the Boltzmann equation, the entropy of this system is zero.
18.9K
Metallic Solids02:37

Metallic Solids

18.4K
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 malleability....
18.4K
Ionic Crystal Structures02:42

Ionic Crystal Structures

14.3K
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...
14.3K
Classification of Elements and Compounds02:54

Classification of Elements and Compounds

66.6K
Pure substances consist of only one type of matter. A pure substance can be an element or a compound. An element consists of only one type of atom, while a compound consists of two or more types of atoms held together by a chemical bond. Elements are classified as atomic or molecular based on the nature of their basic units.
Compounds are pure substances composed of two or more elements in fixed, definite proportions. Compounds are classified as ionic or molecular (covalent) based on the bonds...
66.6K
Network Covalent Solids02:18

Network Covalent Solids

13.5K
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...
13.5K
Valence Bond Theory02:42

Valence Bond Theory

8.5K
Coordination compounds and complexes exhibit different colors, geometries, and magnetic behavior, depending on the metal atom/ion and ligands from which they are composed. In an attempt to explain the bonding and structure of coordination complexes, Linus Pauling proposed the valence bond theory, or VBT, using the concepts of hybridization and the overlapping of the atomic orbitals. According to VBT, the central metal atom or ion (Lewis acid) hybridizes to provide empty orbitals of suitable...
8.5K

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関連する実験動画

Updated: Jul 1, 2025

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
09:41

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Published on: May 29, 2018

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一次元の高エントロピー化合物

Junyi Du1, Shuai Liu1, Ye Liu1

  • 1Key Laboratory of Multifunctional Nanomaterials and Smart Systems, Advanced Materials Division, Suzhou Institute of Nano-Tech and Nano-Bionics, Chinese Academy of Sciences, Suzhou 215123, China.

Journal of the American Chemical Society
|March 14, 2024
PubMed
まとめ
この要約は機械生成です。

研究者は,一次元 (1D) の高エントロピー化合物 (HEC) を合成するための新しい方法を開発した. この突破により,性能と安定性が向上した新しい1D高エントロピー金属フォスフィード (HEP) 材料の作成が可能になりました.

さらに関連する動画

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

Published on: February 15, 2016

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

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関連する実験動画

Last Updated: Jul 1, 2025

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides
09:41

Bulk and Thin Film Synthesis of Compositionally Variant Entropy-stabilized Oxides

Published on: May 29, 2018

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Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates
06:35

Construction and Systematical Symmetric Studies of a Series of Supramolecular Clusters with Binary or Ternary Ammonium Triphenylacetates

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Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations
13:56

Probe Type II Band Alignment in One-Dimensional Van Der Waals Heterostructures Using First-Principles Calculations

Published on: October 12, 2019

7.6K

科学分野:

  • 材料科学
  • ナノテクノロジー
  • 化学について

背景:

  • 一次元の (1D) 高エントロピー化合物 (HEC) は,電子の移位によりユニークな性質を提供します.
  • サブナノ直径の1D HECを合成することは困難であり,その性質は十分に理解されていません.

研究 の 目的:

  • 1D HEC のスケーラブルな合成方法を開発する.
  • 合成された1D高エントロピー金属リン酸化物 (HEPs) の構造と性質を調査する.

主な方法:

  • コメルトリング・フィーリング・フリージング・モディフィケーション (Co-MFFM) の方法が採用された.
  • 単一壁の炭素ナノチューブ (SWCNTs) の内部に様々な金属カチオンを同時に封じ込める.
  • その後,SWCNT内の1D HEPナノワイヤを形成する酸化プロセス.

主要な成果:

  • 超微細で高エントロピーの無形1DHEPナノワイヤをSWCNTで成功裏に合成しました
  • 核殻構造は,π電子を寄付し,保護を提供するSWCNTを特徴としています.
  • 電子移位,高電触媒活性,安定性を改善した.

結論:

  • 同MFFM方法は,優れた特性を持つ1D HEPを合成するのに有効です.
  • SWCNTシェルは1D HEPの性能を向上させる.
  • この方法はスケーラブルで,多様な1D HECを合成するのに適用できます.