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関連する概念動画

Metallic Solids02:37

Metallic Solids

19.4K
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....
19.4K
Valence Bond Theory02:42

Valence Bond Theory

9.8K
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...
9.8K
Crystal Field Theory - Octahedral Complexes02:58

Crystal Field Theory - Octahedral Complexes

28.1K
Crystal Field Theory
To explain the observed behavior of transition metal complexes (such as colors), a model involving electrostatic interactions between the electrons from the ligands and the electrons in the unhybridized d orbitals of the central metal atom has been developed. This electrostatic model is crystal field theory (CFT). It helps to understand, interpret, and predict the colors, magnetic behavior, and some structures of coordination compounds of transition metals.
CFT focuses on...
28.1K
Ionic Crystal Structures02:42

Ionic Crystal Structures

15.4K
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...
15.4K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

10.2K
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...
10.2K

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Updated: Sep 29, 2025

Ligand-Mediated Nucleation and Growth of Palladium Metal Nanoparticles
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液体細胞TEMのメタステーブル六角密集パラジウム水化物

Jaeyoung Hong1, Jee-Hwan Bae1, Hyesung Jo2

  • 1Advanced Analysis Center, Korea Institute of Science and Technology, Seoul, Korea.

Nature
|March 24, 2022
PubMed
まとめ

研究者らは,合理的な設計を用いて,新しい転移性パラジウム水化物 (PdHx) 構造を発見した. この突破は,合成中の前駆体濃度を制御することによって,性能を向上した新材料の発見を可能にします.

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Detection and Recovery of Palladium, Gold and Cobalt Metals from the Urban Mine Using Novel Sensors/Adsorbents Designated with Nanoscale Wagon-wheel-shaped Pores
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Revealing Dynamic Processes of Materials in Liquids Using Liquid Cell Transmission Electron Microscopy

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科学分野:

  • 材料科学
  • クリスタルグラフィー
  • ナノテクノロジー

背景:

  • 運動的に好ましい結晶構造であるメタステーブルフェーズは一般的ですが,発見することは困難です.
  • 材料科学におけるイノベーションを制限する ヒューリスティックに依拠しています
  • メタステーブルな材料は,安定した相と比較して優れた物理化学的性質を持つことができます.

研究 の 目的:

  • 新しい超安定物質の発見のための合理的な設計戦略を開発する.
  • 新型メタステーブル六角密集 (hcp) パラジウム水化物 (PdHx) の合成と特徴づけ
  • 熱力学的原理を理解する

主な方法:

  • 液体細胞伝導電子顕微鏡で,転移性パラジアム水化物 (PdHx) の合成
  • 前駆体濃度 (水素とパラジウム) の制御された操作.
  • 構造変化を観察するために,伝送電子顕微鏡を用いたインシトゥの特徴付け.

主要な成果:

  • メタステーブル六角密集 (hcp) パラジウム水化物 (PdHx) の合成に成功した.
  • 特定の前駆体濃度によってhcp相の安定化が実証された.
  • パラジウム供給を制御することによって,安定した面中心の立方相への移行の抑制を特定した.

結論:

  • 合理的な設計アプローチは,メタステーブルな材料の発見におけるヒューリスティックな制限を克服することができます.
  • 前駆物質の濃度は,転移性結晶構造の制御と安定化において重要な要因である.
  • この研究は,メタスタビリティエンジニアリングと新しい高度な材料の発見のための枠組みを提供します.