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相关概念视频

Colloidal precipitates01:09

Colloidal precipitates

593
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
593
Coagulation01:06

Coagulation

307
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
307
Ion Exchange01:17

Ion Exchange

594
Ion exchange chromatography separates charged molecules from a solution by reversibly exchanging them with mobile, or 'active', ions associated with the oppositely charged stationary phase. This method can be used to separate ions, soften and deionize water, and purify solutions. The polymers comprising the ion-exchange column are high-molecular-weight and chemically stable polymers, crosslinked to be porous and essentially insoluble. They are also functionalized with either acidic or...
594

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在可电离的合性纳米粒子中诱导相变.

Leticia López-Flores1, Monica Olvera de la Cruz2,3,4

  • 1Department of Materials Science and Engineering, Northwestern University, Evanston, IL, 60208, USA.

The European physical journal. E, Soft matter
|December 7, 2023
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概括

由pH值调节的粒子电荷影响着体系统. 增加的pH值导致电荷多分散性,导致从有序到无序的粒子排列的过渡,形成无形固体.

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科学领域:

  • 体科学 体科学 体科学
  • 物理化学 物理化学
  • 计算物理 计算物理

背景情况:

  • 酸平衡通过功能组的离子化对粒子的功能性和行为产生重大影响,从而导致电荷交换.
  • 控制粒子相互作用和电离需要调整pH值和盐度,但建模这些效应,特别是电荷调节和合悬浮中的合作现象,仍然具有挑战性.
  • 库伦比相互作用和电荷调节很难纳入可电离的体系统的理论和模拟方法.

研究的目的:

  • 在不同pH条件下分析悬浮中的可电离合颗粒的行为.
  • 调查电荷调节对粒子排列和相位过渡的影响.
  • 导出一个相图的体系统作为pH的函数.

主要方法:

  • 利用分子动力学 (MD) 模拟来研究可离子化体颗粒的悬浮.
  • 用电荷调节的蒙特卡洛模拟 (MC-CR) 来建模电离过程.
  • 通过分析各种pH值的模拟结果,得出相位图.

主要成果:

  • 观察到粒子排列从面中心立方 (FCC) 包装到 pH 增加时的无序状态的过渡.
  • 他将这些结构转变归因于电荷多分散度与pH值上升的日益增加.
  • 证明电荷调节可以在具有足够高的平均纳米粒子电荷的合体系统中诱导无形固体形成.

结论:

  • 电荷调节显著影响电离性合体悬浮物的宏观行为和相位行为.
  • 这项研究为理解和预测由pH依赖的电荷变化驱动的体相转换提供了一个框架.
  • 电荷调节被认为是导致充电的合体系统中无形固体形成的关键机制.