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相关概念视频

Diffusion01:12

Diffusion

191.7K
Diffusion is the passive movement of substances down their concentration gradients—requiring no expenditure of cellular energy. Substances, such as molecules or ions, diffuse from an area of high concentration to an area of low concentration in the cytosol or across membranes. Eventually, the concentration will even out, with the substance moving randomly but causing no net change in concentration. Such a state is called dynamic equilibrium, which is essential for maintaining overall...
191.7K
Passive Diffusion: Overview and Kinetics01:17

Passive Diffusion: Overview and Kinetics

455
Passive diffusion is a critical process that allows small lipophilic drugs to cross the cell membrane along a concentration gradient. This mechanism's efficiency depends on four primary factors: the membrane's surface area, the drug's lipid-water partition coefficient, the concentration gradient, and the membrane's thickness.
When administered orally, drugs establish a substantial concentration gradient between the gastrointestinal (GI) lumen and the bloodstream, expediting...
455
Theories of Dissolution: Diffusion Layer Model01:15

Theories of Dissolution: Diffusion Layer Model

738
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...
738

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相关实验视频

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Taking Advantage of Reduced Droplet-surface Interaction to Optimize Transport of Bioanalytes in Digital Microfluidics
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了解离子液微乳液中的滴滴扩散.

Adhip Rahman1, Shaila Alam1, Shirin Akter Jahan2

  • 1Department of Chemistry, University of Dhaka, Dhaka 1000, Bangladesh.

The journal of physical chemistry. B
|April 25, 2024
PubMed
概括

这项研究揭示了使用光散射在离子液微乳液中的滴滴扩散. 更快的扩散涉及集体滴滴运动,而更慢的扩散与粘度和溶剂相互作用有关.

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科学领域:

  • 物理化学 物理化学
  • 材料科学 材料科学 材料科学
  • 合体和表面化学

背景情况:

  • 离子液体 (ILs) 在非水性微乳液中被探索为极性成分.
  • 这些复杂的配方具有独特的运输和结构性质.
  • 在药物输送和清洁技术中,IL有潜在的应用.

研究的目的:

  • 为了研究基于离子液的微乳液中的滴滴扩散过程.
  • 了解扩散,粘度和相位行为之间的关系.
  • 探索这些复杂系统的纳米结构动态.

主要方法:

  • 使用粘度测量.
  • 采用去极化动态光散射 (DDLS) 来分析扩散.
  • 研究的微乳液含有1--3-甲基利米达四甲酸 ([C4mim]BF4).

主要成果:

  • 观察到强度相关函数的双模放松,类似于聚合物溶液.
  • 确定了与滴滴集群运动相关的更快的集体扩散过程.
  • 发现与化效应和微乳液粘度相关的扩散过程较慢.
  • 报告说,集体扩散系数 (Dcol) 与水性微乳液相比较.

结论:

  • 在IL微乳液中的滴滴扩散表现出复杂的动态.
  • 集体扩散受滴滴聚类和粘度的影响.
  • 这些发现将扩散行为与微乳液成分和相位图位置相关联.