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関連する概念動画

Ionic Crystal Structures02:42

Ionic Crystal Structures

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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...
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States of Water01:23

States of Water

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Water exists in any one of the three classical states: solid (ice), liquid (water), and gas (steam or water vapor). The state of water depends on i) the intermolecular forces that draw molecules together and ii) the kinetic energy that leads to movements that pull them apart.
Water freezes when the intermolecular forces are greater than the kinetic energy. Unlike most other substances, water is less dense in its solid state than in its liquid state. This is because each water molecule can form...
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Metallic Solids02:37

Metallic Solids

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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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Molecular Comparison of Gases, Liquids, and Solids02:26

Molecular Comparison of Gases, Liquids, and Solids

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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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Hydrogen Bonds01:04

Hydrogen Bonds

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A hydrogen bond is formed when a weakly positive hydrogen atom already bonded to one electronegative atom (for example, the oxygen in the water molecule) is attracted to another electronegative atom from another polar molecule, such as water (H2O), hydrogen fluoride (HF), or ammonia (NH3). The huge electronegativity difference between the H atom (2.1) and the atom to which it is bonded (4.0 for an F atom, 3.5 for an O atom, or 3.0 for an N atom), combined with the very small size of an H atom...
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Alkyl Halides02:45

Alkyl Halides

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Structural Properties
Alkyl halides are halogen-substituted alkanes wherein one or more hydrogen atoms of an alkane is replaced by a halogen atom such as fluorine, chlorine, bromine, or iodine. The carbon atom in an alkyl halide is bonded to the halogen atom, which is sp3-hybridized and exhibits a tetrahedral shape.
Unlike alkyl halides, compounds in which a halogen atom is bonded to an sp2 -hybridized carbon atom of a carbon-carbon double bond (C=C) are called vinyl halides. Whereas aryl...
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関連する実験動画

Updated: Sep 8, 2025

From Molecules to Materials: Engineering New Ionic Liquid Crystals Through Halogen Bonding
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アルキルグアニニニウム硫酸水素結合有機枠の液体とガラス相

Adam H Slavney1, Hong Ki Kim1, Songsheng Tao2

  • 1Department of Chemistry and Chemical Biology, Harvard University, Cambridge, Massachusetts 02138, United States.

Journal of the American Chemical Society
|June 14, 2022
PubMed
まとめ

100°C以下で溶解する新しいグアニジニウムオルガンスルフォナート (HOF) を開発した. この材料はゲスト依存の移行を示し,膜やメモリデバイスでの応用が有望である.

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Electrophoretic Crystallization of Ultrathin High-performance Metal-organic Framework Membranes
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科学分野:

  • 材料科学
  • 超分子化学
  • クリスタルグラフィー

背景:

  • フレームワーク材料のガラスの相は,高度なアプリケーションのために調整可能な性質を提供します.
  • 水素結合有機フレームワーク (HOF) は,ガス分離,固体電解質,およびメモリ装置の可能性のある材料のクラスです.

研究 の 目的:

  • 新しいグアニジニウムオルガンスルフォナート (HOF) を報告する.
  • このHOFの低温溶解とガラスの性質を調査する.
  • HOFの構造的移行におけるゲスト分子の役割を理解する.

主な方法:

  • 新しいグアニジニウムオルガンスルフォナートHOFの合成
  • 熱転移 (溶解,ガラス転移,再結晶) を研究するための差分スキャニングカロメトリ (DSC).
  • 無形と結晶の局所構造を分析するためのX線散射と分子シミュレーション.

主要な成果:

  • HOFは100°C以下で溶解し,ガラス化する.
  • ゲスト分子との非共性相互作用は,HOFの安定性と移行を著しく影響する.
  • アモルフな液体とガラスの相は,母結晶構造と局所的な構造的類似性を共有しています.

結論:

  • 開発されたHOFは低温でガラスのような振る舞いを示しています.
  • 材料の相変化を制御するために重要なものです.
  • この発見は,調節可能な熱および構造特性を要求するアプリケーションのためのHOFの設計に関する洞察を提供します.