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関連する概念動画

Metallic Solids02:37

Metallic Solids

20.5K
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....
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Recrystallization: Solid–Solution Equilibria01:10

Recrystallization: Solid–Solution Equilibria

2.6K
Recrystallization is a purification technique used to separate impurities from solid compounds. In this technique, no chemical reactions occur. Instead, it exploits physical properties only, specifically, the solubility differences between the desired compound and impurities, either at a single temperature or at different temperatures, and under other selected conditions. The solid-solution equilibrium (solubility equilibrium) of each component in the solution represents a binary phase...
2.6K
Structures of Solids02:22

Structures of Solids

17.5K
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...
17.5K
Network Covalent Solids02:18

Network Covalent Solids

16.1K
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...
16.1K
Molecular and Ionic Solids02:54

Molecular and Ionic Solids

20.0K
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...
20.0K
Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

54.2K
Particles in a solid are tightly packed together (fixed shape) and often arranged in a regular pattern; in a liquid, they are close together with no regular arrangement (no fixed shape); in a gas, they are far apart with no regular arrangement (no fixed shape). Particles in a solid vibrate about fixed positions (cannot flow) and do not generally move in relation to one another; in a liquid, they move past each other (can flow) but remain in essentially constant contact; in a gas, they move...
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Author Spotlight: Magnetometric Characterization of Intermediates in the Solid-State Electrochemistry of Redox-Active Metal-Organic Frameworks
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メタル・オーガニック・フレームワークの代替固体溶液における固体多色放射

Wesley J Newsome1, Suliman Ayad2, Jesus Cordova1

  • 1Department of Chemistry , University of Central Florida , 4111 Libra Drive, Room 251 PSB , Orlando , Florida 32816-2366 , United States.

Journal of the American Chemical Society
|July 3, 2019
PubMed
まとめ

研究者は金属有機フレームワーク (MOF) を使用して調節可能な多色発光材料を作成しました. これらの新しいMOFは複数の光分子を含み,高度なアプリケーションのための光放出特性を正確に制御することができます.

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科学分野:

  • 材料科学
  • 化学について
  • 固体物理学

背景:

  • 調節可能な多色放射のための固体材料の分子包装を制御することは困難です.
  • メタル・オーガニック・フレームワーク (MOF) は,代替的な固体溶液を作成するための有望なマトリックスを提供します.
  • 複数のフッ素を単一の材料に組み込むことは,多様な排出プロファイルにとって鍵となる.

研究 の 目的:

  • 調節可能な多色放射を持つ有機ベースの代替固体溶液の製造方法を開発する.
  • 高対称性MOFを制御されたフローロフォアの組み込み用マトリックスとして利用する.
  • 溶液のような光性を結晶材料で達成する.

主な方法:

  • 合成されたジルコニア型のMOFは,非光と赤,緑,青の光リンクの組み合わせを使用しています.
  • MOFマトリックス内の光結合の混合物 (約1mol%の濃度)
  • 分析された光特性,スペクトルプロファイル,量子収量,および生命周期ダイナミクス.

主要な成果:

  • 溶液のような光特性を有する散発材料.
  • 内部フィルタリング効果の低下が,低濃度フッ素で観察された.
  • 初期フローロフォール比によってのみ制御される調節可能な色素性.
  • 多色と白光を放射し,高量子率 (2~14%) と高カラーレンダリングインデックス (> 93) を有する材料.

結論:

  • オーガニックベースの代替固体溶液をMOF内で調節可能な排出量で成功裏に準備した.
  • 開発されたMOFは,高量子収量,高カラーレンダリングインデックス,長期保存期間,水解性安定性を有しています.
  • このアプローチは,高度な発光材料を設計するための堅実な戦略を提供します.