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関連する概念動画

Laminar and Turbulent Flow01:07

Laminar and Turbulent Flow

9.7K
Fluid dynamics is the study of fluids in motion. Velocity vectors are often used to illustrate fluid motion in applications like meteorology. For example, wind—the fluid motion of air in the atmosphere—can be represented by vectors indicating the speed and direction of the wind at any given point on a map. Another method for representing fluid motion is a streamline. A streamline represents the path of a small volume of fluid as it flows. When the flow pattern changes with time, the...
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Viscosity01:17

Viscosity

5.6K
When water is poured into a glass, it falls freely and quickly, whereas if honey or maple syrup is poured over a pancake, it flows slowly and sticks to the surface of the container. This difference in the flow of different kinds of liquids arises due to the fluid friction between the liquid layers and the liquid and the surrounding material. This property of fluids is called fluid viscosity. In this example, water has a lower viscosity than honey and maple syrup.
The SI unit of viscosity is...
5.6K
Viscosity01:27

Viscosity

192
Viscosity is a property of fluids that measures their resistance to flow. It is influenced by factors such as the surface area of contact, the gradient of flow speed, and the fluid's viscosity constant, called the coefficient of viscosity. The coefficient of viscosity, also known as dynamic viscosity, is denoted by the symbol η. It determines the proportionality between the viscous force and the gradient of flow speed.Newton's law of viscosity states that the viscous force on a...
192
Surface Tension of Fluid01:22

Surface Tension of Fluid

2.0K
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...
2.0K
Eulerian and Lagrangian Flow Descriptions01:22

Eulerian and Lagrangian Flow Descriptions

1.8K
Fluid flow analysis is critical in many scientific and engineering disciplines, and two principal approaches are used to describe this flow: the Eulerian and Lagrangian methods. These methods offer different perspectives on monitoring and analyzing the motion of fluids, each with distinct advantages depending on the scenario.
The Eulerian method focuses on fixed points in space where fluid properties, such as velocity, pressure, and temperature, are observed as the fluid moves between these...
1.8K
Couette Flow01:22

Couette Flow

1.4K
Couette flow represents the flow of fluid between two parallel plates, with one plate fixed and the other moving with a constant velocity. This configuration allows for a simplified analysis using the Navier-Stokes equations, which govern fluid motion under conditions of viscosity and incompressibility. For Couette flow, the assumptions include a steady, laminar, incompressible flow with a zero-pressure gradient in the flow direction. This flow type is beneficial for understanding shear-driven...
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Updated: May 6, 2026

Separating Beads and Cells in Multi-channel Microfluidic Devices Using Dielectrophoresis and Laminar Flow
09:45

Separating Beads and Cells in Multi-channel Microfluidic Devices Using Dielectrophoresis and Laminar Flow

Published on: February 5, 2011

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光学格子におけるマイクロ流体分類

M P MacDonald1, G C Spalding, K Dholakia

  • 1School of Physics and Astronomy, University of St Andrews, North Haugh, St Andrews, Fife KY16 9SS, UK. mpm4@st-and.ac.uk

Nature
|December 4, 2003
PubMed
まとめ
この要約は機械生成です。

研究者らは,3D光学格子を使用して,微小粒子をサイズまたは屈折指数によって正確にソートするための新しい光学ソートを開発しました. この非侵襲的な技術は,生物学的およびコロイド的研究アプリケーションのための高い効率とスループットを達成します.

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Microfluidic Mixers for Studying Protein Folding
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Trapping of Micro Particles in Nanoplasmonic Optical Lattice
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関連する実験動画

Last Updated: May 6, 2026

Separating Beads and Cells in Multi-channel Microfluidic Devices Using Dielectrophoresis and Laminar Flow
09:45

Separating Beads and Cells in Multi-channel Microfluidic Devices Using Dielectrophoresis and Laminar Flow

Published on: February 5, 2011

30.1K
Microfluidic Mixers for Studying Protein Folding
12:42

Microfluidic Mixers for Studying Protein Folding

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Trapping of Micro Particles in Nanoplasmonic Optical Lattice
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科学分野:

  • 光学とフォトニック
  • マイクロフリウジック
  • バイオテクノロジー バイオテクノロジー

背景:

  • 光学場は,顕微鏡の介電物体を操作することができ,光学トラップのようなアプリケーションを可能にします.
  • 粒子操作と分類のための既存の方法には,効率とスループットの限界があります.

研究 の 目的:

  • 顕微鏡粒子のための新しい光学的分類器を実証するために.
  • 動的に再構成可能な3D光学格子を使用して,粒子をソートします.
  • 粒子の性質に基づく調整可能な選択基準を達成するために.

主な方法:

  • 拡張され,相互接続され,動的に再構成可能な3D光学格子を使用します.
  • 格子部位との粒子の相互作用を利用し,光学的偏極性に依存する.
  • タンパク質マイクロカプセルをサイズで,コロイド粒子を屈折指でソートすることを示す.

主要な成果:

  • 100%に近い分類効率を達成し,観測値は96%以上であった.
  • タンパク質マイクロカプセル薬剤のサイズによる分類が実証されました.
  • 折射率でコロイド粒子を順番に並べてみました.
  • 光活性化細胞分類のスループットは,濃縮溶液でも超えられました.

結論:

  • 開発された光学分類器は,粒子操作のための強力で非侵襲的な技術です.
  • この方法は,微流体システムでの分類と分割に適しています.
  • アプリケーションはコロイド,分子,生物学的研究を網羅し,高い効率とスループットを提供します.