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相关概念视频

Entropy and Solvation02:05

Entropy and Solvation

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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...
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Solubility03:00

Solubility

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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,...
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Enthalpy of Solution02:39

Enthalpy of Solution

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There are two criteria that favor, but do not guarantee, the spontaneous formation of a solution:
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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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Hydrogen Bonds00:26

Hydrogen Bonds

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Hydrogen bonds are weak attractions between atoms that have formed other chemical bonds. One of these atoms is electronegative, like oxygen, and has a partial negative charge. The other is a hydrogen atom that has bonded with another electronegative atom and has a partial positive charge.
Hydrogen Bonds Control the World!
Because hydrogen has very weak electronegativity when it binds with a strongly electronegative atom, such as oxygen or nitrogen, electrons in the bond are unequally shared....
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Aqueous Solutions and Heats of Hydration02:42

Aqueous Solutions and Heats of Hydration

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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...
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在天然岩石中重新审视 sorption-desorption 的情况.

Mohammad Masoudi1,2, Ariel G Meyra3,4, Mohammad Nooraiepour2

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概括

在岩石中吸附和脱落是地下应用的关键. 本综述综合了研究,以澄清的行为及其对地质储存和运输的影响.

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科学领域:

  • 地质化学 地质化学
  • 环境科学 环境科学
  • 能源科学 能源科学

背景情况:

  • 在岩石中吸附/脱附气对于地下能源和环境应用至关重要.
  • 了解这些相互作用对于诸如地下储存和放射性废物储存等应用至关重要.
  • 目前关于这些物理相互作用如何影响地质材料中的行为的知识是有限的.

研究的目的:

  • 对天然岩石中 sorption 和 desorption 的实验和理论研究进行审查.
  • 为了评估吸附能力,影响参数和不同石质学的hysteresis.
  • 为了确定 sorption 数据的最合适的等温模型.

主要方法:

  • 对实验和理论研究的文献评论.
  • 原子模拟和异热模拟. 原子模拟和异热模拟.
  • 数据分析吸附能力,影响参数和歇斯底里.
  • 使用多个等热体模型对可用的数据进行建模.

主要成果:

  • 吸附能力在不同的岩石类型 (石质) 中有很大差异.
  • 确定了影响和脱的关键参数,以及歇斯底里.
  • 该研究确定了最适合用于描述吸附数据的异热模型.
  • 审查描述了物理吸附-脱吸是显著的,而不是可以忽略的条件.

结论:

  • 物理吸附-脱附在特定地质环境中对的运输和保留起着至关重要的作用.
  • 了解这些过程对于有效的储存,勘探和废物控制至关重要.
  • 确定了数据缺口,并提出了未来的研究方向,以改善对地质构成中的行为理解.