相关实验视频
Updated: Jul 15, 2025

09:31
Surface Properties of Synthesized Nanoporous Carbon and Silica Matrices
Published on: March 27, 2019
9.5K
表面自由能量和可溶性参数与介电常数和无机固体密度的相关性
Hongfei Wang1, Wanguo Hou1,2
1Key Laboratory for Colloid and Interface Chemistry (Ministry of Education), Shandong University, Jinan 250100, P. R. China.
Langmuir : the ACS journal of surfaces and colloids
|September 28, 2023
概括
研究人员确定了无机固体的表面自由能量 (γ) 和可溶性 (δ) 参数之间的相关性. 这些发现使得使用易于测量的物理量,如介电常数 (εr) 和密度 (ρ),可以估计特征参数.
科学领域:
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
- 固态物理 固态物理
背景情况:
- 表面自由能量 (γ) 和溶解度 (δ) 参数对于理解材料特性至关重要.
- 这些特征参数的现有相关性仅限于液体,而不是固体.
- 对于固体来说,估计 γ 和 δ 是具有挑战性和耗时的.
研究的目的:
- 对无机固体的特征参数 (γ, δ) 和基本物理性质 (εr, ρ) 之间探索和建立内在的相关性.
- 从易于测量的数量开发经验方程来估计γ和δ.
- 为了解决固体材料缺乏确定的相关性.
主要方法:
- 收集了34种无机固体的表面自由能量 (γ),溶解度 (δ),相对介电常数 (εr) 和密度 (ρ) 的数据.
- 采用试错拟合方法来确定特征参数和物理量之间的关系.
- 根据收集的固态数据开发了六个经验方程.
主要成果:
- 建立了六种新的经验方程,将表面自由能量 (γ) 和溶解度 (δ) 参数与无机固体的相对介电常数 (εr) 和密度 (ρ) 联系起来.
- γ参数包括总 (γt),分散 (γd) 和极 (γp) 组件.
- δ参数包括希尔德布兰德 (δt),汉森分散 (δd),极性 (δp) 和键 (δh) 组件.
结论:
- 由此得出的经验方程为估计无机固体特征参数提供了可靠的方法.
- 这些相关性简化了对固体材料的表面自由能量和溶解度的评估.
- 这些发现有助于更深入地了解固体中的分子间相互作用.
相关概念视频
Susceptibility, Permittivity and Dielectric Constant
1.6K
When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
1.6K
Entropy and Solvation
7.1K
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...
7.1K
Solubility Equilibria
52.8K
Solubility equilibria are established when the dissolution and precipitation of a solute species occur at equal rates. These equilibria underlie many natural and technological processes, ranging from tooth decay to water purification. An understanding of the factors affecting compound solubility is, therefore, essential to the effective management of these processes. This section applies previously introduced equilibrium concepts and tools to systems involving dissolution and precipitation.
The...
The...
52.8K
Chemical and Solubility Equilibria
4.1K
The free energy change associated with dissolving a solute in a liter of solvent is called the free energy of a solution, ΔGsolution. The overall ΔGsolution is expressed as the balance of ΔGinteraction against the always-favorable free-energy of mixing, ΔGmixing. Solution formation is favorable if ΔGsolution is less than zero, whereas it is unfavorable if ΔGsolution is greater than zero. In short, for a solution to form and complete dissolution to take place,...
4.1K
Solubility of Ionic Compounds
63.3K
Solubility is the measure of the maximum amount of solute that can be dissolved in a given quantity of solvent at a given temperature and pressure. Solubility is usually measured in molarity (M) or moles per liter (mol/L). A compound is termed soluble if it dissolves in water.
63.3K
Extraction: Partition and Distribution Coefficients
2.5K
The distribution law or Nernst's distribution law is the law that governs the distribution of a solute between two immiscible solvents. This law, also known as the partition law, states that if a solute is added to the mixture of two immiscible solvents at a constant temperature, the solute is distributed between the two solvents in such a way that the ratio of solute concentrations in the solvents remains constant at equilibrium.
For extracting a solute from an aqueous phase into an...
For extracting a solute from an aqueous phase into an...
2.5K

