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関連する概念動画

Lattice Centering and Coordination Number02:33

Lattice Centering and Coordination Number

12.2K
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...
12.2K
Metallic Solids02:37

Metallic Solids

20.9K
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....
20.9K
Coordination Number and Geometry02:57

Coordination Number and Geometry

19.1K
For transition metal complexes, the coordination number determines the geometry around the central metal ion. Table 1 compares coordination numbers to molecular geometry. The most common structures of the complexes in coordination compounds are octahedral, tetrahedral, and square planar.
19.1K
Coordination Compounds and Nomenclature02:54

Coordination Compounds and Nomenclature

26.9K
In most main group element compounds, the valence electrons of the isolated atoms combine to form chemical bonds that satisfy the octet rule. For instance, the four valence electrons of carbon overlap with electrons from four hydrogen atoms to form CH4. The one valence electron leaves sodium and adds to the seven valence electrons of chlorine to form the ionic formula unit NaCl (Figure 1a). Transition metals do not normally bond in this fashion. They primarily form coordinate covalent bonds, a...
26.9K
Porosity and Absorption of Aggregate01:20

Porosity and Absorption of Aggregate

821
Aggregates contain pores of varying sizes; while some are completely enclosed within the particles, others open onto the surface, allowing water to penetrate. The porosity of aggregates is a major factor contributing to the overall porosity of concrete, given that aggregates constitute about three-quarters of concrete's volume.
When all pores in an aggregate are filled with water, the aggregate is considered saturated and surface-dry. If left in dry air, water will evaporate until the...
821
Porosity in Cement Paste01:18

Porosity in Cement Paste

470
The porosity of concrete is a measure of the void spaces within its structure. These spaces impact its strength and durability significantly. When water and cement interact, a chemical reaction called hydration creates a semi-solid paste. This paste includes combined water, making up approximately 23% of the cement's dry mass, and gel water, which fills minuscule voids known as gel pores, accounting for about 28% of the cement gel volume.
The balance of water to cement in the mix is...
470

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Synthesis of Monodisperse Cylindrical Nanoparticles via Crystallization-driven Self-assembly of Biodegradable Block Copolymers
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協調制御による自己組み立て:双方向性有孔性の固体.

Katie Campbell1, Christopher J Kuehl, Michael J Ferguson

  • 1Department of Chemistry, University of Alberta, Edmonton AB T6G 2G2, Canada.

Journal of the American Chemical Society
|June 20, 2002
PubMed
まとめ
この要約は機械生成です。

研究者らは,マクロサイクルの金属誘導型自己組み立てを用いて,新しい多孔性の材料を作成した. この材料は双方向のチャネルを示し,二塩基エタンのような小さな有機客の選択的吸収の可能性を示しています.

さらに関連する動画

Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy

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Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets
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Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets

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Atomic Scale Structural Studies of Macromolecular Assemblies by Solid-state Nuclear Magnetic Resonance Spectroscopy
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Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets
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Solid-phase Submonomer Synthesis of Peptoid Polymers and their Self-Assembly into Highly-Ordered Nanosheets

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科学分野:

  • 超分子化学 超分子化学
  • 材料科学 材料科学とは
  • クリスタログラフィーです.

背景:

  • 協調性駆動の自己組み立ては,離散的な超分子種と協調性ポリマーを作るための鍵です.
  • 毛細なネットワークを形成する際の課題には,小分子吸収を阻害する格子間の相互浸透が含まれます.
  • ナノスケールのマクロサイクルは,相互浸透を防ぐことによって,多孔性の固体を作る戦略を提供します.

研究 の 目的:

  • 双方向に多孔な固体材料を開発する.
  • 配合ポリマー形成における格子相互浸透の問題を回避するために.
  • 毛細な構造を作り出すための自己組み立てマクロサイクルの可能性を探求する.

主な方法:

  • 結合されたマクロサイクリックリガンドの金属誘導セルフアセンブリを使用した.
  • 溶液と固体状態で発生する離散型超分子実体を特徴づけた.
  • 固体状態のパッキングとチャネル形成を決定するために,X線結晶学分析を使用しました.

主要な成果:

  • 分離的で超分子的な実体は,金属方向の自己組み立てによって成功裏に形成されました.
  • X線結晶学では,組み立てパックが双方向のチャネルを作成することを確認しました.
  • 1,2-ジクロロエタン (ClCH2CH2Cl) の選択的組み込みが結晶格子に観察されました.

結論:

  • 合成された材料は,二方向性のある多孔質の固体を形成します.
  • 観測された双方向的なチャネルは,小型の有機客の選択的吸収に適しています.
  • このアプローチは,格子間の相互浸透を回避する多孔性の材料を設計するための実行可能な戦略を提供します.