通过超疏水性表面涂层研究核沸的抑制机制
Jinxin Lai1,2, Qiaoli Lin1,2
1School of Materials Science and Engineering, Lanzhou University of Technology, Lanzhou, Gansu 730050, China.
Langmuir : the ACS journal of surfaces and colloids
|February 25, 2026
概括
超疏水涂层通过降低Leidenfrost点来控制沸点. 具有特定粗度的更厚涂层进一步降低了这一点,提高了热管理.
科学领域:
- 材料科学 材料科学 材料科学
- 热传递热量转移的方法
- 表面科学是一门学科.
背景情况:
- 原子核在高温下沸会导致机械侵蚀和传热不稳定.
- 超性涂层正在通过莱登弗罗斯特点调节来研究沸点控制,但机制需要澄清.
研究的目的:
- 调查超性涂层厚度和形态学对莱登冰点的影响.
- 为热管理中微/纳米尺度表面设计提供以机制为导向的证据.
主要方法:
- 在基板上制造薄 (6.928微米) 和厚 (28.438微米) 的超性涂层.
- 测量了Leidenfrost点和表征了表面形态 (粗度Sa = 10.4μm). 测量了Leidenfrost点和表征了表面形态 (粗度Sa = 10.4μm).
主要成果:
- 厚涂层的Leidenfrost点 (240°C) 比薄涂层 (260°C) 低,降低了20°C.
- 降低Leidenfrost点与粗度增加有关,纹结构促进蒸气逃逸,并抑制核酸沸.
- 核的沸抑制归因于核化值以下的微腔,高接触角度减少粘附,并增强蒸汽散发.
结论:
- 涂层厚度和形态显著影响莱登点和沸行为.
- 研究结果为设计面部提供了有效的高热量流热管理的见解.
- 在相同的表面化学条件下进行受控比较,提供了基于机制的强有力的证据.
相关概念视频
Surface Tension, Capillary Action, and Viscosity
33.9K
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...
33.9K
Intermolecular Forces and Physical Properties
28.8K
28.8K
Surface Tension of Fluid
1.8K
Surface tension is a fundamental property of fluids, occurring at the boundary between a liquid and a gas or between two immiscible liquids. This phenomenon arises from the cohesive forces between molecules at the fluid's surface, creating an effect similar to a stretched elastic membrane. Inside each fluid, molecules are equally attracted in all directions by neighboring molecules, but surface molecules experience a net inward force, resulting in surface tension.
Surface tension varies...
Surface tension varies...
1.8K
Vapor Pressure Lowering
31.8K
The equilibrium vapor pressure of a liquid is the pressure exerted by its gaseous phase when vaporization and condensation are occurring at equal rates:
31.8K
Sublimation
5.3K
Sublimation is the direct transformation of a solid to a gaseous state. For instance, at standard pressure and room temperature, solid carbon dioxide sublimes to gaseous carbon dioxide. The phase diagram depicts the conditions required for sublimation. This process occurs at the solid-gas phase boundary and is not observed above the triple point of the substance. The reverse of sublimation is called deposition, where a gaseous substance condenses directly into a solid. Sublimation and...
5.3K
Colloidal precipitates
6.6K
The high insolubility of some precipitates can result in an unfavorable relative supersaturation. This can lead to colloidal particles with a large surface-to-mass ratio, where adsorption is promoted. For instance, in the precipitation of silver chloride, silver ions are adsorbed on the surface of the colloidal particles, forming a primary layer. This layer attracts ions of opposite charge (such as nitrate ions), forming a diffuse secondary layer of adsorbed ions. This electric double layer...
6.6K


