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相关概念视频

Colloids03:22

Colloids

17.5K
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 that are visible to the naked eye or can be seen with a magnifying glass. They are cloudy, and the suspended particles settle out after mixing. On the other hand, a solution is a homogeneous mixture in which no settling occurs and in which the dissolved...
17.5K
Colloidal precipitates01:09

Colloidal precipitates

580
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...
580
Rise of Liquid in a Capillary Tube01:18

Rise of Liquid in a Capillary Tube

1.8K
When very thin cylindrical tubes, called capillaries, are dipped in a liquid, the liquid rises or falls in the tube compared to the surrounding liquid. This phenomenon is called capillary action. Capillary action occurs due to the combination of two opposing forces: the cohesive forces of the liquid, which cause it to stick to itself and form a rounded shape, and the adhesive forces between the liquid and the walls of the container, which cause the liquid to be attracted to the container walls.
1.8K
Coagulation01:06

Coagulation

297
Colloidal solids are solid particles suspended in solution. They are usually negatively charged, attracting a compact primary layer of positively charged ions, which attract more counterions to form an electrical double layer. Electrostatic repulsion between the charged double layers prevents the particles from colliding, stabilizing the colloids. These solids are often undesirable because they can contain toxins that are difficult to remove. Coagulation is a technique that helps aggregate and...
297
Colloids and Suspensions01:17

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
Centrifugation01:05

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

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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如何引导活性合物向上垂直的墙壁.

Adérito Fins Carreira1, Adam Wysocki2, Christophe Ybert1

  • 1Université de Lyon, Université Claude Bernard Lyon 1, CNRS, Institut Lumière Matière, Villeurbanne, France.

Nature communications
|February 24, 2024
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概括

活动物质颗粒,由自推力驱动,可以爬上墙壁反对重力. 这创造了一个动态层和一个全局流动,与被动湿层不同.

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科学领域:

  • 物理 物理学 物理
  • 软物质物理学 软物质物理学
  • 结合体科学 结合体科学

背景情况:

  • 活性物质系统利用本地工作产生全球影响.
  • 毛细血管升高是被动系统中的经典现象.
  • 自行驱动的Janus合体表现出复杂的行为.

研究的目的:

  • 调查毛细血管上升的活性物质模拟.
  • 探索垂直墙上的粒子行为.
  • 了解从当地活动中产生全球工作的产生.

主要方法:

  • 对靠近墙壁的自行车的Janus合体进行实验研究.
  • 开发一个互补的数值模型.
  • 分析粒子动力学和层形成.

主要成果:

  • 在墙上观察到一个意想不到的动态吸附层.
  • 证明一个粘合和对齐墙可以增强极性异质性.
  • 显示了极性活性粒子在抵抗重力时爬上墙壁.
  • 建立了一个由活性粒子驱动的稳定状态全球流.

结论:

  • 活性物质可以产生对抗重力的定向全球流.
  • 墙壁相互作用显著影响活性物质的集体行为.
  • 这种活跃的毛细血管上升效应为工作提取提供了新的途径.