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関連する概念動画

Metallic Solids02:37

Metallic Solids

20.3K
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....
20.3K
Structures of Solids02:22

Structures of Solids

17.3K
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...
17.3K
Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

11.2K
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...
11.2K
Ionic Crystal Structures02:42

Ionic Crystal Structures

16.6K
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...
16.6K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

19.7K
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...
19.7K
Ziegler–Natta Chain-Growth Polymerization: Overview01:17

Ziegler–Natta Chain-Growth Polymerization: Overview

3.8K
Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
3.8K

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Indirect Fabrication of Lattice Metals with Thin Sections Using Centrifugal Casting
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テンプレート指向型エウテクティック固化でアルキメデスの格子が生じる

Ashish A Kulkarni1,2,3, Erik Hanson4, Runyu Zhang1,2,3

  • 1Department of Materials Science and Engineering, University of Illinois at Urbana-Champaign, Champaign, IL, USA.

Nature
|January 17, 2020
PubMed
まとめ
この要約は機械生成です。

テンプレートによる組み立ては,柱のテンプレート内の固化率を制御することによって,三葉および六葉のパターンを含む新しいエウテクティック・メソストラクチャを作成しました. これらのオーダーされた微細構造は,先進的な材料と技術で潜在的応用があります.

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科学分野:

  • 材料科学
  • ナノテクノロジー
  • クリスタルグラフィー

背景:

  • テンプレート・ディレクテッド・アセンブリは,独特の対称性を持つ高度にオーダーされたメソ構造を生成します.
  • タービンブレードや溶接合金などの技術には不可欠ですが テンプレートはありません
  • 既存のテンプレートメソッドは,エウテクティック・システムには適用できない.

研究 の 目的:

  • テンプレート指向の組み立てをエウテクティック材料に適用する.
  • エウテクティックAgCl-KClをテンプレート化することで得られる微細構造の結果を調査する.
  • 先進的な応用におけるメソ構造の潜在性を探求する.

主な方法:

  • 柱模板内のAgCl-KClエウテクティックの方向性固化
  • 微細構造の形成を制御するために固化速度を変化させる.
  • 拡散制約を理解するために相場シミュレーションを使用します.
  • 単層のコロイド結晶を代替テンプレートとして使用する.

主要な成果:

  • ネイティブのラメラーとテンプレート六角構造とは異なる新しい微細構造の出現.
  • 三葉,四葉,五葉,六葉メソストラクチャの実現は,サブマイクロメートルの特徴を持つ.
  • フェーズフィールドシミュレーションは,拡散駆動メソ構造形成のテンプレート制約を確認します.
  • カゴームのようなパターンを含むコロイド結晶のテンプレートを用いて類似のメソ構造の観測.

結論:

  • テンプレート・ディレクテッド・アセンブリは,多様なエウテクティック・メソストラクチャを成功裏に生成します.
  • 六角柱のテンプレートと固化率は複雑なパターンを形成する上で重要なものです.
  • テンプレートエウテクティクスは,メタ表面,スピンアイスシステム,強化された機械的な格子のための有望な経路を提供します.