稳定的大滴子集群的反转.
Alexander A Fedorets1, Eduard E Kolmakov1, Leonid A Dombrovsky1,2
1X-BIO Institute, University of Tyumen, 6 Volodarskogo St., Tyumen 625003, Russia.
Langmuir : the ACS journal of surfaces and colloids
|April 30, 2024
概括
微滴集群在加热的水层上自发地重新排列. 滴滴直径比,或"反转系数",决定了这种反转,较大的滴滴由于空气-蒸汽流动阻力而向内移动.
科学领域:
- 流体动力学 流体动力学
- 微观尺度的现象
- 表面张力是表面的张力.
背景情况:
- 自组装的微滴集群在加热的水层上悬浮.
- 在这些集群中观察到滴滴重排或反转.
- 空气-蒸汽流场影响滴水的行为.
研究的目的:
- 研究微滴在悬浮集群中的自发重新排列.
- 确定控制集群逆转开始的因素.
- 了解滴滴大小,拖动和旋转在重新排列中的作用.
主要方法:
- 在加热水层上悬浮的微滴集群的实验设置.
- 使用"反向系数" (中至外围滴水直径比) 分析滴水动力学和重新排列.
- 考虑空气-蒸气流动力学和滴滴旋转效应.
主要成果:
- 反转系数被确定为控制集群反转的关键参数.
- 较大的水滴向中心移动,这是由于空气蒸气流的阻力增加.
- 滴滴旋转显著影响由于粘性摩擦较小的集群的反转.
结论:
- 集群逆转是由不同大小的水滴上的差拉力驱动的.
- 滴滴旋转是较小集群逆转动态的一个关键因素.
- 避免集群逆转对于需要精确滴滴跟踪的实验至关重要.
相关概念视频
Colloidal precipitates
574
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...
574
Centrifugation
2.2K
Centrifugation is a separation technique based on differences in density or size. It is commonly used to separate solids from aqueous interferents. During centrifugation, the sample is placed in centrifugation tubes and spun at high angular velocity, which allows centrifugal force to act differentially on the different densities or masses of the components. After spinning, the supernatant liquid is decanted. Depending on the specific application, either the pellet or the supernatant is retained...
2.2K
Colloids and Suspensions
1.8K
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...
1.8K


