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相关概念视频

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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相关实验视频

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

水动力学和水-聚乙烯二元混合物的相互作用.

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
概括

这项研究使用超快红外光谱学揭示了聚乙烯氧化物 (PEO) 溶液中水分子的独特行为. 水分子与其他水分子或与PEO以太骨干相互作用,显示出独特的动态放松模式.

科学领域:

  • 聚合物科学 聚合物科学
  • 物理化学 物理化学
  • 频谱学是一种光谱学方法.

背景情况:

  • 聚乙烯氧化物 (PEO) 是一种多功能聚合物,在膜,结晶和医疗器械中具有应用.
  • PEO的独特特性源于它与水的相互作用,形成键.
  • 对PEO-水相互作用的动态研究很少,特别是在以太氧与基群相互作用方面.

研究的目的:

  • 研究水与PEO的以太骨干的动态相互作用.
  • 要区分与聚合物骨干相关的水动力学与散装水的水动力学.
  • 了解甲基终结PEO衍生物中的水分子行为.

主要方法:

  • 超快的红外极化选择性探针光谱学.
  • 测量水的基拉伸模式.
  • 在水/四乙烯糖醇二甲基乙醇 (TEGDE) 混合物中分析振动和定向放松动态.

主要成果:

  • 确定了两种不同的水子集:水-水结合和水-TEGDE关联.
  • 水的定向放松显示出快速 (比秒) 和缓慢 (大约. 20 ps) 的衰变部件.
  • 即使在低水度下也观察到这些动态,这表明水聚集.

更多相关视频

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

相关实验视频

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

结论:

  • 在PEO溶液中的水分子存在于不同的动态状态.
  • 该研究强调了水和PEO以太骨干之间的特定相互作用.
  • 结果提供了对结构变化和不同含水量的疏水相互作用的见解.