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相关概念视频

Colloids03:22

Colloids

17.4K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
17.4K
Colloidal precipitates01:09

Colloidal precipitates

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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...
560
Precipitate Formation and Particle Size Control01:16

Precipitate Formation and Particle Size Control

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In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
772
Colloids and Suspensions01:17

Colloids and Suspensions

1.8K
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
1.8K
Solubility03:00

Solubility

17.5K
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,...
17.5K
Entropy and Solvation02:05

Entropy and Solvation

7.0K
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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Two-dimensional strain-mapping by electron backscatter diffraction and confocal Raman spectroscopy.

Journal of applied physics·2025
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Updated: Jun 23, 2025

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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热力学稳定的合体固体:从粒子大小分布的界面热力学.

Andrew Nelson1, Lawrence H Friedman1

  • 1Materials Measurement Science Division, National Institute of Standards and Technology, 100 Bureau Drive, Gaithersburg, MD 20899.

The journal of physical chemistry. C, Nanomaterials and interfaces
|June 17, 2024
PubMed
概括
此摘要是机器生成的。

这项研究将经典核化理论应用于体系统,揭示了尺寸依赖的界面自由能量,这对于理解纳米粒子稳定性至关重要. 研究结果表明,一些系统可能是超稳定的,而不是绝对稳定的.

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Synthesis and Characterization of Supramolecular Colloids
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Last Updated: Jun 23, 2025

Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures

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Synthesis and Characterization of Supramolecular Colloids
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科学领域:

  • 合体和表面科学科学
  • 材料化学 材料化学
  • 热力学是一种热力学.

背景情况:

  • 在固体合溶液分散中,真正的热力学稳定性是罕见的,并且研究不足.
  • 了解长期稳定性和准备途径不敏感性是非常有趣的.
  • 现有的模型通常假定绝对热力学稳定性,这可能不是真的.

研究的目的:

  • 将经典核化理论 (CNT) 应用于体系统,以将粒子大小分布与大小依赖的界面自由能量联系起来.
  • 为了适应使用CNT的纳米粒子大小分布的实验数据.
  • 为了研究金-硫醇和磁铁的纳米粒子系统的热力学稳定性.

主要方法:

  • 应用经典核化理论 (CNT) 来建模体系统.
  • 与粒子大小分布相关的界面自由能量密度.
  • 通过使用CNT. 拟合金-醇和磁石纳米颗粒的实验尺寸分布数据.

主要成果:

  • 黄金-醇系统数据与界面自由能量 (γ) 很好地匹配,遵循r−3.3的功率定律.
  • 磁铁纳米粒子数据与CNT很好地匹配,其中γ遵循r-2.2的功率定律.
  • 额外推算的平面自由能量密度很小并且是正的;系统看起来非常稳定.

结论:

  • 经典核化理论有效地描述了体系统中尺寸依赖的界面自由能量.
  • 研究的黄金-醇和磁铁系统可能是超稳定的,挑战绝对稳定的假设.
  • 界面能量参数的衍生表达式,适用于未来对表面活性剂度,温度和粒子分布的研究.