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相关概念视频

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...
Solubility03:00

Solubility

Solution, Solubility, and Solubility Equilibrium
A solution is a homogeneous mixture composed of a solvent, the major component, and a solute, the minor component. The physical state of a solution—solid, liquid, or gas—is typically the same as that of the solvent. Solute concentrations are often described with qualitative terms such as dilute (of relatively low concentration) and concentrated (of relatively high concentration).
In a solution, the solute particles (molecules, atoms, and/or ions)...
Solubility Equilibria: Overview01:09

Solubility Equilibria: Overview

When a substance such as sodium chloride is added to water, it dissolves, forming an aqueous solution. The extent of dissolution is called solubility. The process of dissolution can exist in equilibrium, just like other chemical processes. Solubility equilibria are also called precipitation equilibria because the process of solubility can be reversible. The reverse of the solubility process is called precipitation.
Solubility is important in biological and environmental processes. A notable...
Solubility Equilibria: Ionic Product of Water01:16

Solubility Equilibria: Ionic Product of Water

Pure water is a weak electrolyte; only a small amount ionizes into hydrogen and hydroxide ions. At any given temperature, the concentration of undissociated water is almost constant, so the ionic product of water is the product of the hydrogen and hydroxide ion concentrations, denoted as Kw. The square root of Kw gives the individual ion concentrations.
The ionic product of water varies with temperature, and its value is 1.0 x 10−14 at standard experimental conditions. Per Le Chatelier's...
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...
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...

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相关实验视频

Updated: Jun 26, 2026

Pore-scale Imaging and Characterization of Hydrocarbon Reservoir Rock Wettability at Subsurface Conditions Using X-ray Microtomography
12:18

Pore-scale Imaging and Characterization of Hydrocarbon Reservoir Rock Wettability at Subsurface Conditions Using X-ray Microtomography

Published on: October 21, 2018

油水界面:绘制溶解潜力的地图.

Richard C Bell1, Kai Wu, Martin J Iedema

  • 1Chemistry Department, The Pennsylvania State University, Altoona College, Altoona, Pennsylvania 16601, USA.

Journal of the American Chemical Society
|January 22, 2009
PubMed
概括

研究人员直接测量了油水界面的离子溶解潜力. 这为测试生物和大气系统中离子行为理论提供了一种新方法.

科学领域:

  • 物理化学 物理化学
  • 表面科学是一门学科.
  • 交通运输 交通运输 交通运输

背景情况:

  • 当离子穿过油水接口时,它们会经历显著的溶解变化.
  • 了解这些变化对于大气科学和生物学等领域至关重要.
  • 在这些接口上直接测量溶解潜力仍然具有挑战性.

研究的目的:

  • 直接测量从油侧接近油水接口的离子 (Cs+) 经历的溶解潜力.
  • 开发和验证一种新的实验方法,用于探测界面上的离子溶解潜力.
  • 将实验结果与对离子行为的理论预测进行比较.

主要方法:

  • 在30K的油水接口 (3-甲基) 的制造,使用分子束的epitaxy.
  • 使用软着陆离子束在接口内的精确离子放置.
  • 通过凯尔文探测器测量离子运动在升温到90K时,将运动与溶解电位倾斜度相关联.
  • 整合溶解电位斜率以确定电位.

主要成果:

  • 从油水界面直接测量0.4至4纳米的Cs+离子的溶解潜力.
  • 在距离接口的距离大于0.4nm的距离上,发现溶解潜力是波恩式的.
  • 实验方法成功确定了溶解潜力的局部斜率.

更多相关视频

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
09:42

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

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Pore-scale Imaging and Characterization of Hydrocarbon Reservoir Rock Wettability at Subsurface Conditions Using X-ray Microtomography
12:18

Pore-scale Imaging and Characterization of Hydrocarbon Reservoir Rock Wettability at Subsurface Conditions Using X-ray Microtomography

Published on: October 21, 2018

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes
09:42

Unraveling Entropic Rate Acceleration Induced by Solvent Dynamics in Membrane Enzymes

Published on: January 16, 2016

结论:

  • 开发的方法允许在油水接口上直接测量离子溶解潜力.
  • 这些发现为离子溶解的理论模型提供了实验验证.
  • 这种技术为测试在生物和大气界面上的离子运动理论提供了一条途径.