重新进入的微结构在调节滴滴蒸发模式中的作用
Hoang Huy Vu1, Nam-Trung Nguyen1, Navid Kashaninejad1
1Queensland Micro- and Nanotechnology Centre, Griffith University, Nathan Campus, 170 Kessels Road, Brisbane, QLD 4111, Australia.
Micromachines
|January 8, 2025
概括
表面材料和结构显著影响滴水蒸发. 较低的表面自由能量 (SFE) 和更宽的间隙加速了蒸发,而更窄的间隙稳定了重新进入的微观结构上的水滴.
科学领域:
- 表面科学和微流体学
- 材料科学与工程 材料科学与工程
- 软物质的物理学 软物质的物理学
背景情况:
- 重新进入的微结构通过捕获空气来增强不湿度,这对于微流体,热管理和自清洁表面至关重要.
- 了解这些结构上的滴水蒸发动力是优化表面性能的关键.
研究的目的:
- 为了研究水滴在碳化 (SiC) 和二氧化 (SiO2) 再入微观结构上的蒸发.
- 分析材料组成 (SFE) 和结构几何 (固体面积分数) 对蒸发动态的影响.
主要方法:
- 在SiC和SiO2重新进入表面上对状滴水蒸发的实验性检查.
- 对体积减小,接触角度变化和蒸发模式的分析.
- 湿度 (通过SFE) 和结构参数 (固体面积分数) 与蒸发动力学的相关性.
主要成果:
- 与SiO2相比,SiC表面的较低表面自由能量 (SFE) 会导致更快的接触线脱落和收缩.
- 在SiC (55-59%) 上,恒定接触线 (CCL) 阶段比SiO2 (51-68%) 短,表明蒸发速度更快.
- 增加的固体面积分数 (更窄的柱子间隙) 稳定了水滴,延长了CCL和恒定接触角 (CCA) 阶段,而更大的间隙促进了更快的蒸发.
结论:
- 疏水性和结构几何是控制微观液体行为的关键因素.
- 回入表面的设计可以通过调整材料SFE和固体面积分数来定制,以优化液体管理和蒸发控制.
相关概念视频
02:39Phase Transitions: Vaporization and Condensation
The physical form of a substance changes on changing its temperature. For example, raising the temperature of a liquid causes the liquid to vaporize (convert into vapor). The process is called vaporization—a surface phenomenon. Vaporization occurs when the thermal motion of the molecules overcome the intermolecular forces, and the molecules (at the surface) escape into the gaseous state. When a liquid vaporizes in a closed container, gas molecules cannot escape. As these gas phase molecules...
01:16Precipitate Formation and Particle Size Control
In precipitation gravimetry, the precipitating agent should react specifically or selectively with the analyte. While a specific reagent reacts with the analyte alone, a selective reagent can react with a limited number of chemical species.
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
The obtained precipitate should be either a pure substance of known composition or easily converted to one by a simple process, such as ignition or drying. In addition, the precipitate should be insoluble and easily filterable. In general, filterability...
01:09Theories 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...