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相关概念视频

Intermolecular Forces in Solutions02:28

Intermolecular Forces in Solutions

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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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Factors Affecting Solubility04:01

Factors Affecting Solubility

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Compared with pure water, the solubility of an ionic compound is less in aqueous solutions containing a common ion (one also produced by dissolution of the ionic compound). This is an example of a phenomenon known as the common ion effect, which is a consequence of the law of mass action that may be explained using Le Chȃtelier’s principle. Consider the dissolution of silver iodide:
33.1K
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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Ionic Strength: Effects on Chemical Equilibria01:19

Ionic Strength: Effects on Chemical Equilibria

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The addition of an inert ionic compound increases the solubility of a sparingly soluble salt. For example, adding potassium nitrate to a saturated solution of calcium sulfate significantly enhances the solubility of calcium sulfate. Le Châtelier's principle cannot predict this shift in the equilibrium. Instead, this could be explained in terms of changes in the effective concentration of the ions in solution in the presence of added inert salt.
In this solution, the primary...
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Qualitative Analysis03:46

Qualitative Analysis

21.7K
For solutions containing mixtures of different cations, the identity of each cation can be determined by qualitative analysis. This technique involves a series of selective precipitations with different chemical reagents, each reaction producing a characteristic precipitate for a specific group of cations. Metal ions within a group are further separated by varying the pH, heating the mixture to redissolve a precipitate, or adding other reagents to form complex ions.
For instance, group IV...
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Hydration of Cement01:24

Hydration of Cement

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Hydration of cement is a chemical reaction between cement particles and water. This process occurs primarily through two mechanisms: through-solution and topochemical. In the through-solution process, anhydrous compounds dissolve into their constituents, hydrates form in the solution, and then precipitate from the supersaturated solution. The topochemical process involves solid-state reactions at the cement particle surface. The through-solution process dominates the topochemical process at the...
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在氧化溶液下的伊利特溶解:从反应性分子动力学的见解.

Wenguo Ma1, Wenhang Yuan1, Peng Wang2

  • 1Key Laboratory for Enhanced Oil & Gas Recovery of the Ministry of Education, Northeast Petroleum University, Daqing 163318, Heilongjiang, China.

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概括

/表面活性剂/聚合物 (ASP) 洪水通过溶解粘土矿物质而造成水库损坏. 这项研究模拟了Illite在NaOH中的溶解,揭示了高度如何阻碍离子扩散并促进氧化物沉,改善了石油回收的洞察力.

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科学领域:

  • 地质化学 地质化学
  • 材料科学 材料科学 材料科学
  • 石油工程是石油工程中的一个.

背景情况:

  • /表面活性剂/聚合物 (ASP) 洪水对于增强石油回收至关重要.
  • 类与储粘土 (伊利特,蒙莫里隆石,考林石) 反应,造成损坏并减少石油回收.
  • 了解性诱导的粘土溶解对于优化ASP洪水至关重要.

研究的目的:

  • 通过分子动力学模拟来研究Illite在NaOH溶液中的溶解机制.
  • 分析不同NaOH度对阴离子扩散,离子交换和产物形成的影响.
  • 为了评估质子和离子能量的变化在伊利特溶解中的作用.

主要方法:

  • 利用ReaxFF反应力场和分子动力学模拟.
  • 在不同度的NaOH溶液中模拟Illite溶解.
  • 分析了扩散系数,离子相互作用,溶解产物,质子和离子能量.

主要成果:

  • 增加的NaOH度导致稳定的金属氧化物,阻碍了阴离子扩散.
  • 发生水分离和离子交换,以酸作为氧化物沉.
  • 质子化传播到伊利特结构中,随着NaOH度的增加而增加.
  • K+表现出最高的反应性,而中间酸盐产品是不稳定的.

结论:

  • 在ASP洪水中高度的NaOH可以通过改变粘土矿物溶解路径来减轻水库损害.
  • 分子动力学模拟为粘土-相互作用的机制提供了关键的见解.
  • 这些发现有助于优化ASP洪水战略,以提高石油回收率.