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関連する概念動画

Factors Affecting Activity Coefficient01:17

Factors Affecting Activity Coefficient

The extended Debye-Hückel equation indicates that the activity coefficient of an ion in an aqueous solution at 25°C depends on three partially interdependent properties: the ionic strength of the solution, the charge of the ion, and the ion size. 
The activity coefficient value for an ion is close to one when the solution has almost zero ionic strength, i.e., when the solution shows close to ideal behavior. As the ionic strength of the solution increases from 0 to 0.1 mol/L, a decrease in the...
Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration02:34

Regioselectivity and Stereochemistry of Acid-Catalyzed Hydration

The rate of acid-catalyzed hydration of alkenes depends on the alkene's structure, as the presence of alkyl substituents at the double bond can significantly influence the rate.
Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

Water and other polar molecules are attracted to ions. The electrostatic attraction between an ion and a molecule with a dipole is called an ion-dipole attraction. These attractions play an important role in the dissolution of ionic compounds in water.
When ionic compounds dissolve in water, the ions in the solid separate and disperse uniformly throughout the solution because water molecules surround and solvate the ions, reducing the strong electrostatic forces between them. This process...
Ionic Association01:28

Ionic Association

The ionic association is the association of oppositely charged ions in an electrolyte solution to form ion pairs. Bjerrum defined ion pairs as two oppositely charged ions whose electrostatic attraction exceeds the thermal energy of the system, typically expressed as 2kT. Electrostatic attraction depends on ionic charge, separation distance, and the dielectric constant of the medium. Thermal energy, represented by kT, reflects the tendency of ions to move independently due to molecular motion.
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...
Cooperative Allosteric Transitions01:58

Cooperative Allosteric Transitions

Cooperative allosteric transitions can occur in multimeric proteins, where each subunit of the protein has its own ligand-binding site. When a ligand binds to any of these subunits, it triggers a conformational change that affects the binding sites in the other subunits; this can change the affinity of the other sites for their respective ligands. The ability of the protein to change the shape of its binding site is attributed to the presence of a mix of flexible and stable segments in the...

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関連する実験動画

Updated: Jun 12, 2026

Inner Mitochondrial Membrane Sensitivity to Na+ Reveals Partially Segmented Functional CoQ Pools
05:27

Inner Mitochondrial Membrane Sensitivity to Na+ Reveals Partially Segmented Functional CoQ Pools

Published on: July 20, 2022

イオン水分化における協力関係

K J Tielrooij1, N Garcia-Araez, M Bonn

  • 1FOM Institute for Atomic and Molecular Physics (AMOLF), Science Park 104, 1098 XG Amsterdam, Netherlands.

Science (New York, N.Y.)
|May 22, 2010
PubMed
まとめ
この要約は機械生成です。

イオンとカウンターイオンは,水構造とダイナミクスを直接的な環境を超えて影響します. この相互依存は,最初の溶解殻を超えて水分子に影響を与え,複雑なイオン-水相互作用を明らかにします.

さらに関連する動画

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
10:28

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Published on: May 27, 2018

関連する実験動画

Last Updated: Jun 12, 2026

Inner Mitochondrial Membrane Sensitivity to Na+ Reveals Partially Segmented Functional CoQ Pools
05:27

Inner Mitochondrial Membrane Sensitivity to Na+ Reveals Partially Segmented Functional CoQ Pools

Published on: July 20, 2022

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water
16:24

Controlling the Size, Shape and Stability of Supramolecular Polymers in Water

Published on: August 2, 2012

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy
10:28

Probing the Structure and Dynamics of Interfacial Water with Scanning Tunneling Microscopy and Spectroscopy

Published on: May 27, 2018

科学分野:

  • 物理化学 物理化学とは
  • 化学物理学 化学物理学とは
  • スペクトロスコーピーは,スペクトロスコーピーを用います.

背景:

  • イオンと水の相互作用を理解することは,様々な科学分野にとって極めて重要です.
  • 以前の研究は,直接の水分化殻に焦点を当て,長期的な効果とイオン特異的な起源が不明のままにしていました.

研究 の 目的:

  • 水のダイナミクスに対するイオン効果の空間的な範囲を調査する.
  • 水に対するイオンと対イオンの影響の相互依存性と非添加性を探求する.
  • 水溶液におけるイオン特異効果の起源を解明する.

主な方法:

  • 組み合わせたテラヘルツ (THz) とフェムト秒赤外線 (fsIR) のスペクトロスコーピー.
  • 様々なカチオン (Mg2+, Li+, Na+, Cs+) とアニオン (SO42-, Cl-, I-, ClO4-) を含む溶液における水の動態を研究した.

主要な成果:

  • 水力学に対するイオンと対イオンの影響は相互依存し,添加物ではない.
  • 水の構造と動力学に対するイオンの影響は,最初の溶解殻を超えて大幅に広がります.
  • 特定のイオンタイプに基づいて水の混乱の明確なパターンを実証した.

結論:

  • 水のダイナミクスに対するイオン特異的影響は複雑で,これまで考えられていた以上に広がっています.
  • イオンとカウンターイオンの相互作用は,水の振る舞いを大きく調節する.
  • 遠距離のイオンと水の相互作用を検知するために,高度なスペクトロスコピー技術が必要であることを強調しています.