相关实验视频
Updated: Jun 25, 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,折射率和液体密度的相关性
Hongfei Wang1, Wanguo Hou1,2
1Key Laboratory for Colloid and Interface Chemistry (Ministry of Education), Shandong University, Jinan 250100, P. R. China.
The journal of physical chemistry. B
|May 22, 2024
概括
研究人员探索了表面自由能量 (γ) 和溶解度 (δ) 参数以及92种液体的基本物理性质之间的相关性. 他们建立了经验关系,以从可测量的物理量中估计特征参数.
科学领域:
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
- 热力学是一种热力学.
背景情况:
- 表面自由能量 (γ) 和溶解度 (δ) 参数是物质的关键特性参数.
- 这些参数与由于分子间相互作用的基本物理性质密切相关.
- 了解这些相关性对于基本的科学洞察力和实际应用至关重要.
研究的目的:
- 研究特征参数 (γ 和 δ) 与基本物理量之间的内在相关性.
- 从易于测量的物理性质来估计特征参数的经验关系.
主要方法:
- 探索了表面自由能量 (总,分散,极) 和可溶性 (希尔德布兰德,汉森分散,极,结合) 参数与折射率 (nD),介电常数 (εr) 和密度 (ρ) 之间的关系.
- 采用试错配套方法,使用92种不同的液体 (非极性,极性,与结合) 的数据.
- 使用66种液体的独立数据集验证了衍生的经验关系.
主要成果:
- 建立了特定的经验关系,将每个特征参数 (γt, γd, γp, δt, δd, δp, δh) 与物理量 (nD, εr, ρ) 连接起来.
- 通过外部验证证明了这些关系的适用性和可靠性.
- 展示了从易于获得的物理数据中估计关键特征参数的潜力.
结论:
- 确认了液体的特征参数和基本物理性质之间的内在相关性.
- 开发了用于预测表面自由能量和可溶性参数的实用实证模型.
- 这些模型为从易于测量的物理量中估计基本液体性质提供了宝贵的工具.
相关概念视频
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...
7.0K
Susceptibility, Permittivity and Dielectric Constant
1.5K
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.
1.5K
Surface Tension, Capillary Action, and Viscosity
27.7K
Surface Tension
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
The various IMFs between identical molecules of a substance are examples of cohesive forces. The molecules within a liquid are surrounded by other molecules and are attracted equally in all directions by the cohesive forces within the liquid. However, the molecules on the surface of a liquid are attracted only by about one-half as many molecules. Because of the unbalanced molecular attractions on the surface molecules, liquids contract to form a shape that minimizes the number...
27.7K
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
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility
44.3K
Intermolecular forces are attractive forces that exist between molecules. They dictate several bulk properties, such as melting points, boiling points, and solubilities (miscibilities) of substances. Molar mass, molecular shape, and polarity affect the strength of different intermolecular forces, which influence the magnitude of physical properties across a family of molecules.
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
Temporary attractive forces like dispersion are present in all molecules, whether they are polar or nonpolar. They...
44.3K
Intermolecular Forces and Physical Properties
20.8K
20.8K

