相关实验视频
Updated: Jun 21, 2025

08:01
The Diffusion of Passive Tracers in Laminar Shear Flow
Published on: May 1, 2018
8.5K
在复杂的生命周期和微观扩散在深层欧性溶剂之间的解关系.
T Rinesh1,2, H Srinivasan1,2, V K Sharma1,2
1Solid State Physics Division, Bhabha Atomic Research Centre, Mumbai 400085, India.
The Journal of chemical physics
|July 8, 2024
概括
水通过改变微观动力学和运输特性来影响深层环氧溶剂 (DES). 这项研究揭示了键动力学和扩散机制是如何相互连接的,这对于理解DES行为至关重要.
科学领域:
- 物理化学 物理化学
- 材料科学 材料科学 材料科学
背景情况:
- 深度浸泡溶剂 (DES) 的水性混合物表现出可调节的物理化学性质.
- 了解水对DES微观动力学和运输的影响至关重要,但有限.
- DES扩散机制是复杂的,受键和复杂的形成/解离动力学影响.
研究的目的:
- 研究DESs中的键动力学,扩散机制和动态异质性之间的关系.
- 探索不同水度对乙胺 - 甲DES放松现象的影响.
- 阐明水添加如何调节DES中的分子动力学和运输特性.
主要方法:
- 在不同水度的乙胺-甲DES中研究了放松现象.
- 分析了扩散机制,包括Fickian和非高斯行为.
- 键寿命 (乙胺-水,乙胺-) 和扩散时间尺度之间的量化关系.
主要成果:
- 乙胺在所有水度中表现出Fickian但非高斯扩散.
- 在Fickian和Gaussian时间尺度之间观察到一种权力法关系 (τgτfγ, γ ∼ 1.4).
- 从车载到结构的扩散机制的过渡被确定在20%的水中,与乙胺-复合物的寿命有关.
结论:
- 在DES中,键动态是分子扩散过程的关键调节者.
- 水度显著影响了DESs中的键动力学和扩散之间的相互作用.
- 这些发现强调了考虑特定相互作用 (例如,键,复杂形成) 对于预测DES行为的重要性.
相关概念视频
Theories of Dissolution: Diffusion Layer Model
730
Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
This process starts with a thin layer, saturated with the drug, forming at the interface between the solid and liquid. The solute then diffuses from this layer into the main solution. The Noyes-Whitney equation suggests that the rate of dissolution relies on the diffusion...
730
Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model
285
Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the...
285
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
Atomic Nuclei: Types of Nuclear Relaxation
286
Nuclear relaxation restores the equilibrium population imbalance and can occur via spin–lattice or spin–spin mechanisms, which are first-order exponential decay processes.
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
In spin–lattice or longitudinal relaxation, the excited spins exchange energy with the surrounding lattice as they return to the lower energy level. Among several mechanisms that contribute to spin–lattice relaxation, magnetic dipolar interactions are significant. Here, the excited nucleus transfers...
286
Diffusion
4.1K
Diffusion is a type of passive transport. In passive transport, a substance tends to move from an area of high concentration to an area of low concentration until the concentration is equal across the space. For example, take the diffusion of substances through the air. When someone opens a perfume bottle in a room filled with people, the perfume is at its highest concentration in the bottle and is at its lowest at the edges of the room. The perfume vapor will diffuse, or spread away, from the...
4.1K
Protein Diffusion in the Membrane
4.3K
Proteins show rotational as well as lateral diffusion across the membrane. The lateral diffusion of proteins was confirmed through the cell fusion experiment where mouse and human cells were fused, resulting in hybrid cells. When the human and mouse cells fused, the specific membrane proteins on human and mouse cells were marked with the red and green-fluorescent markers, respectively. Initially, the red and green fluorescence was located on the respective hemisphere of the cell. As time...
4.3K

