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関連する概念動画

Intermolecular Forces and Physical Properties02:56

Intermolecular Forces and Physical Properties

Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility02:34

Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility

Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
Intermolecular Forces03:13

Intermolecular Forces

Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen bonds, and dispersion...
Physical Properties of Ethers02:17

Physical Properties of Ethers

Overview
An ether molecule has a net dipole moment due to the polarity of C–O bonds. Subsequently, boiling points of ethers are lower than those of alcohols of comparable molecular weight and slightly higher than those of hydrocarbons of comparable molecular weight (Table 1).
Ethers can act as hydrogen bond acceptors, making them more water-soluble than hydrocarbons, but since ethers cannot act as hydrogen bond donors, they are much less soluble in water than alcohols. Ethers are considered...
Entropy and Solvation02:05

Entropy and Solvation

The process of surrounding a solute with solvent is called solvation. It involves evenly distributing the solute within the solvent. The rule of thumb for determining a solvent for a given compound is that like dissolves like. A good solvent has molecular characteristics similar to those of the compound to be dissolved. For example, polar solutions dissolve polar solutes, and apolar solvents dissolve apolar solutes. A polar solvent is a solvent that has a high dielectric constant (ϵ ≥ 15); an...
Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

The formation of a solution is an example of a spontaneous process, a process that occurs under specified conditions without energy from some external source.
When the strengths of the intermolecular forces of attraction between solute and solvent species in a solution are no different than those present in the separated components, the solution is formed with no accompanying energy change. Such a solution is called an ideal solution. A mixture of ideal gases (or gases such as helium and argon,...

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関連する実験動画

Updated: Jun 24, 2026

The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
10:03

The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids

Published on: September 30, 2014

水-ポリエーテルバイナリ混合物の水動力学と相互作用

Emily E Fenn1, David E Moilanen, Nancy E Levinger

  • 1Department of Chemistry, Stanford University, Stanford, California 94305, USA.

Journal of the American Chemical Society
|March 28, 2009
PubMed
まとめ

この研究は,超高速赤外線スペクトロスコーピーを用いてポリエチレン酸化物 (PEO) 溶液中の水分子の明確な行動を示しています. 水分子は,他の水分子またはPEOエーテル骨格と相互作用し,ユニークなダイナミックなリラックスパターンを示します.

科学分野:

  • ポリマーサイエンスの科学
  • 物理化学 物理化学
  • スペクトル顕微鏡検査です.

背景:

  • ポリエチレン酸化物 (PEO) は,膜,結晶化,医療機器などに応用できる多用途のポリマーです.
  • PEOのユニークな性質は,水との相互作用から生じ,水素結合を形成します.
  • PEOと水の相互作用のダイナミックな研究は,特にエーテル酸素とヒドロキシル群の相互作用に関する研究はほとんどありません.

研究 の 目的:

  • PEOのエーテル骨格と水のダイナミックな相互作用を調査する.
  • ポリマーバックボーンと関連した水のダイナミクスを,散発水のダイナミクスを区別するために.
  • メチル終末PEO誘導体の水分子の振る舞いを理解するために.

主な方法:

  • 超高速赤外線偏光選択式ポンプ探査スペクトロスコーピー.
  • 水のヒドロキシル伸縮モードの測定.
  • 水/テトラエチレングリコールジメチルエーテル (TEGDE) の混合物における振動と方向のリラックスダイナミクスの分析.

主要な成果:

  • 2つの異なる水子集合が特定されました:水-水,水素結合および水-TEGDE関連.
  • ウォーター・オリエンテーション・リラクゼーションは,高速 (ピコ秒) と遅い (約. 20 ps) 腐敗成分. 腐食成分. 腐食成分. 腐食成分. 腐食成分. 腐食成分. 腐食成分.

さらに関連する動画

Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification
07:32

Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification

Published on: April 7, 2017

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
09:31

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices

Published on: March 27, 2019

関連する実験動画

Last Updated: Jun 24, 2026

The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids
10:03

The Preparation of Electrohydrodynamic Bridges from Polar Dielectric Liquids

Published on: September 30, 2014

Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification
07:32

Synthesis of Hydrogels with Antifouling Properties As Membranes for Water Purification

Published on: April 7, 2017

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
09:31

Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices

Published on: March 27, 2019

  • これらのダイナミクスは,低濃度の水でも観察され,水の集積を示唆しました.

    • 結論:

    • PEO溶液中の水分子は,異なる動的状態に存在する.
    • この研究は,水とPEOエーテル骨格の間の特定の相互作用を強調しています.
    • 発見は,構造的変化と,水分含有量の変動で発生する水害性相互作用についての洞察を提供します.