多电解质的链间水力动力相互作用和内部摩擦
Ekaterina Buvalaia1, Margarita Kruteva1, Ingo Hoffmann2
1Jülich Centre for Neutron Science JCNS and Institute of Biological Information Processing IBI, Forschungszentrum Jülich GmbH, 52425 Jülich, Germany.
ACS macro letters
|August 25, 2023
概括
多电解质动态揭示了局部链运动与链之间的相互作用脱. 聚电解质之间持续存在水力动力相互作用,并且与离子凝聚增加摩擦.
科学领域:
- 聚合物物理 聚合物物理
- 解决方案化学 解决方案化学
背景情况:
- 多电解质 (PE) 是溶液中带电的聚合物,其结构和动力学受到静电,不包括体积和水力动力相互作用的影响.
- 了解PE行为对于材料科学,纳米技术和生物系统的应用至关重要.
研究的目的:
- 为了研究在稀释到半稀释溶液中的多电解质的动态.
- 为了将宏观扩散与细分链动态和链际相互作用相关联.
主要方法:
- 动态光散射 (DLS) 是一种
- 中子旋转回声 (NSE) 光谱学
- 脉冲场梯度核磁共振 (PFG-NMR) 光谱学
主要成果:
- 观察到局部链动态和链间相互作用之间的脱.
- 集体扩散与结合静电和水力动力学效应的体模型保持一致.
- 链动态遵循齐姆模型,由于离子凝聚,内部摩擦增加.
结论:
- 在多电解质链之间,水力动力相互作用尚未完全选.
- 增加的离子凝聚会导致多电解质链内的内部摩擦较高.
- 这项研究提供了对控制溶液中的多电解质行为力量复杂相互作用的见解.
相关概念视频
Intermolecular Forces
58.7K
Atoms and molecules interact through bonds (or forces): intramolecular and intermolecular. The forces are electrostatic as they arise from interactions (attractive or repulsive) between charged species (permanent, partial, or temporary charges) and exist with varying strengths between ions, polar, nonpolar, and neutral molecules. The different types of intermolecular forces are ion–dipole, dipole–dipole, hydrogen bonds, and dispersion; among these, dipole–dipole, hydrogen...
58.7K
Intermolecular Forces and Physical Properties
20.9K
20.9K
Intermolecular Forces in Solutions
34.0K
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,...
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,...
34.0K
Van der Waals Interactions
64.1K
Atoms and molecules interact with each other through intermolecular forces. These electrostatic forces arise from attractive or repulsive interactions between particles with permanent, partial, or temporary charges. The intermolecular forces between neutral atoms and molecules are ion–dipole, dipole–dipole, and dispersion forces, collectively known as van der Waals forces.
64.1K
Intermolecular vs Intramolecular Forces
87.7K
Intermolecular forces (IMF) are electrostatic attractions arising from charge-charge interactions between molecules. The strength of the intermolecular force is influenced by the distance of separation between molecules. The forces significantly affect the interactions in solids and liquids, where the molecules are close together. In gases, IMFs become important only under high-pressure conditions (due to the proximity of gas molecules). Intermolecular forces dictate the physical properties of...
87.7K
Comparing Intermolecular Forces: Melting Point, Boiling Point, and Miscibility
44.5K
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...
44.5K


