在干燥和沉积过程中对单分散硬球悬浮体的结构演变进行布朗动力学模拟
1School of Food Biotechnology and Chemical Engineering, Hankyong National University, Anseong 17579, Republic of Korea.
The Journal of chemical physics
|November 14, 2024
概括
布朗动力学模拟揭示了干燥速度和沉积如何影响体膜结构. 较高的干燥速度导致不同的结构,而沉积影响了基板附近的包装密度.
科学领域:
- 材料科学 材料科学 材料科学
- 化学工程是化学工程的重要组成部分.
- 物理 物理学 物理
背景情况:
- 合膜在各种应用中至关重要,它们的微观结构决定了性能.
- 了解干燥过程中的组装机制是控制薄膜特性的关键.
研究的目的:
- 为了研究干燥速度和沉积对单分散合膜微观结构的影响.
- 探索无维数Péclet (Pe) 和沉积 (Ns) 在体膜形成中的作用.
主要方法:
- 布朗动力学 (BD) 模拟在牛顿液体中的硬球体粒子.
- 对Péclet数 (Pe) 和沉积数 (Ns) 的系统变化,以研究干燥动态.
- 分析局部颗粒体积分数,薄膜结构和干燥模式.
主要成果:
- 增加的Péclet数 (Pe) 驱动了液体-气体界面的粒子积累.
- 较高的沉积数 (Ns) 促进了基板附近的密集包装.
- 低PE (0.1) 会导致面中心立方体 (FCC) 结构,而高PE会导致六角密集或无形结构.
- 介质PE (10) 与增加的NS增强了FCC的订单.
结论:
- 沉积在干燥合膜的结构演变中起着重要的,以前未被充分研究的作用.
- 干燥速度和沉积相互作用,以确定最终的薄膜微观结构.
- 该研究阐明了合体系统中干燥诱导组装的机制.
相关概念视频
Colloids and Suspensions
Children at play often make suspensions such as mixtures of mud and water, flour and water, or a suspension of solid pigments in water known as tempera paint. These suspensions are heterogeneous mixtures composed of relatively large particles visible to the naked eye or seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. The suspended particles in a suspension settle out after some time of mixing. The separation of particles from a suspension is...
The Colloidal State
The formation of a colloidal system is exemplified by an aqueous solution containing Cl− ions is introduced to another containing Ag+ ions, resulting in the precipitation of solid AgCl as extremely tiny crystals. Instead of settling out as a filterable precipitate, these crystals remain suspended in the liquid, showcasing a colloidal system.A colloidal system involves colloidal particles within the approximate range of 1 to 1000 nm in at least one dimension, dispersed in a medium called the...
Theories of Dissolution: The Danckwerts' Model and Interfacial Barrier Model
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 concentration...


