涂层等离子纳米粒子在粘性环境中的扩散系数
Isabelle Largillière1, Dali Sullivan1, Michel Meunier1
1Department of Engineering Physics, Polytechnique Montréal, Montréal, Québec, H3C 3A7, Canada.
Small (Weinheim an der Bergstrasse, Germany)
|September 25, 2024
概括
聚合物溶液中的纳米粒子扩散偏离了斯托克斯-爱因斯坦关系. 这项研究描述了纳米粒子扩散,揭示了比预期更快的运动,并提供了一个模型来预测生物医学应用的行为.
科学领域:
- 材料科学 材料科学 材料科学
- 物理化学 物理化学
- 纳米技术纳米技术
背景情况:
- 斯托克斯-爱因斯坦关系 (SER) 是预测纳米粒子扩散的一个基本概念.
- 在复杂介质 (如聚合物溶液) 中,SER的局限性需要使用替代的表征方法.
- 了解纳米粒子扩散对于优化它们在生物医学应用中的使用至关重要.
研究的目的:
- 为了研究各种涂层纳米颗粒在基于氨酸的溶液中的扩散行为.
- 确定斯托克斯-爱因斯坦关系是否准确地预测了这些粘性环境中的纳米粒子扩散.
- 开发和验证一个模型,准确地描述聚合物溶液中的纳米粒子扩散.
主要方法:
- 研究了黄金和银纳米粒子在酸溶液中与不同涂层 (酸盐,氨酸,PEG) 的扩散.
- 估计的扩散系数 (D) 使用布朗运动分析与成本效益的侧面照明装置.
- 应用了适应的哈金斯方程来利用有效粘度模型纳米粒子扩散.
主要成果:
- 在粘度为1-30mPa·s的溶液中,纳米粒子的扩散速度是斯托克斯-爱因斯坦关系预测的4-5倍.
- 适应的哈金斯方程,结合聚合物相关长度和水力动力半径,准确地建模了扩散.
- 确定模型参数 (k 和 a),以10-20%的误差预测扩散系数.
- 突出了聚合物和纳米粒子之间的静电相互作用对模型参数的影响.
结论:
- 斯托克斯-爱因斯坦关系对于描述聚合物溶液中的纳米粒子扩散是不够的.
- 适应的哈金斯方程为预测这些系统中的纳米粒子扩散行为提供了一个可靠的模型.
- 这些发现对于定制设计和纳米粒子在生物医学等领域的应用至关重要.
相关概念视频
Viscosity
5.8K
When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...
The SI unit of viscosity is...
5.8K
Surface Tension, Capillary Action, and Viscosity
27.6K
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...
27.6K
Diffusion on Chromatography Columns
484
In column chromatography, when an analyte is introduced as a narrow band at the top of the column, the solutes begin to separate and broaden, developing a Gaussian profile. This broadening occurs due to various factors, such as longitudinal diffusion.
Longitudinal diffusion occurs when the solute molecules in the mobile phase diffuse from the more concentrated center of the chromatographic band to the more dilute regions on either side, both towards and against the flow direction. This...
Longitudinal diffusion occurs when the solute molecules in the mobile phase diffuse from the more concentrated center of the chromatographic band to the more dilute regions on either side, both towards and against the flow direction. This...
484


