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相关概念视频

Colloids and Suspensions01:17

Colloids and Suspensions

1.7K
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...
1.7K
Steady, Laminar Flow Between Parallel Plates01:17

Steady, Laminar Flow Between Parallel Plates

123
Understanding steady, laminar flow between parallel plates is essential for analyzing and designing flow in narrow rectangular channels, commonly found in various water conveyance and drainage systems. The Navier-Stokes equations govern fluid motion and are generally challenging to solve due to their nonlinearity. However, simplifications are possible in certain cases, like the steady laminar flow between parallel plates. For this scenario, we assume steady, incompressible, laminar flow.
123
Steady Flow of a Fluid Stream01:27

Steady Flow of a Fluid Stream

236
Consider a control volume, such as a pipe with solid boundaries, through which fluid flows and changes direction due to the impulse exerted by the resulting force from the pipe walls. In steady flow, the mass of fluid entering the control volume at a given time, t, with velocity v1, is equal to the mass leaving after infinitesimal time dt, with velocity v2.
During this process, the momentum of the fluid within the control volume remains constant over the time interval dt. By applying the...
236
Colloids03:22

Colloids

17.3K
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...
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Capillarity in Fluid01:19

Capillarity in Fluid

104
Capillarity describes the movement of liquid in small spaces without external forces acting on it. The capillarity is driven by surface tension and adhesive interactions between the liquid and surrounding solid surfaces. This effect is often seen in narrow tubes, porous materials, and fine particles.
Surface tension is crucial to capillarity. It results from cohesive forces between liquid molecules at the liquid-air boundary, forming a skin that resists external forces. When the capillary tube...
104

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相关实验视频

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Confocal Imaging of Confined Quiescent and Flowing Colloid-polymer Mixtures
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表面驱动的粒子动力学:在静态流体环境中尝试合体流的顺序同步.

Hyeonseol Kim1, Abbas Ali2, Yumin Kang2

  • 1National Nanofab Center (NNFC), Daejeon 34141, Republic of Korea.

ACS applied materials & interfaces
|February 8, 2025
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概括

研究人员开发了一种无流量微,用于使用微磁图案精确控制微物体. 这个平台可以直接和间接操纵微型货物,推进药物输送和微流体的应用.

关键词:
操纵货物操纵货物的货物操纵.磁场的磁场是磁场的磁场.磁性粒子是磁性的粒子.微流体学 在微流体学方面薄膜图案的图案是薄膜图案.

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Visually Based Characterization of the Incipient Particle Motion in Regular Substrates: From Laminar to Turbulent Conditions
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相关实验视频

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科学领域:

  • 合体和表面化学
  • 微流体和芯片上的实验室技术.
  • 生物技术和纳米技术.

背景情况:

  • 微系统中微物体的精确控制对于药物输送,微流体和纳米技术等应用至关重要.
  • 传统的流体组件往往限制了微物体操纵的精度和范围.
  • 开发用于先进微型货物操纵的新型平台对于科学进步至关重要.

研究的目的:

  • 推出一种新的货物操纵平台,即无流量微,利用微磁图案和流体流.
  • 展示微型货物操纵的两种不同的模式:直接和间接.
  • 建立一个可编程的平台,用于微观系统的各种实验目的.

主要方法:

  • 无流式微型平台将执行粒子和控制目标集成到芯片中,消除了外部流体组件.
  • 非磁性货物 (例如电池) 的直接操纵是通过由特定的壁结构引导的协调粒子碰撞来实现的.
  • 对粒子的间接操纵是通过由图案磁性结构 (铁路轨道和导体图案) 产生的局部流体流来实现的.

主要成果:

  • 该平台展示了微型货物的精确和敏捷控制,包括细胞 (MCF-7,THP-1) 和聚合物珠.
  • 成功实施了两种操纵模式:通过粒子碰撞直接控制和通过局部流体流动间接控制.
  • 有效的微货物操纵在频率为1-3 Hz的频率下,磁场强度为10 mT.

结论:

  • 开发的无流式微型平台提供了一个可编程和多功能工具,用于微型对象操纵.
  • 该平台使用磁性图案产生合体和局部流体流动的能力显示了各种应用的重大前景.
  • 潜在的应用包括药物查,细胞相互作用研究和器官芯片研究.