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Related Concept Videos

Capillarity in Fluid01:19

Capillarity in Fluid

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...

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Related Experiment Video

Updated: Jun 18, 2026

High Speed Droplet-based Delivery System for Passive Pumping in Microfluidic Devices
10:22

High Speed Droplet-based Delivery System for Passive Pumping in Microfluidic Devices

Published on: September 2, 2009

Passive microfluidic pumping using coupled capillary/evaporation effects.

N Scott Lynn1, David S Dandy

  • 1Department of Chemical and Biological Engineering, Colorado State University, Fort Collins, Colorado 80523-1370, USA.

Lab on a Chip
|November 12, 2009
PubMed
Summary
This summary is machine-generated.

This study introduces a novel passive pumping method for microfluidic devices, achieving stable fluid flow for over an hour. This breakthrough enables precise control in lab-on-a-chip systems and chemical gradient generation.

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Area of Science:

  • Microfluidics
  • Fluid Dynamics
  • Analytical Chemistry

Background:

  • Controlled fluid pumping is essential for lab-on-a-chip applications.
  • Existing passive flow methods lack long-term temporal stability.

Purpose of the Study:

  • To present a novel passive pumping approach for microfluidic networks.
  • To achieve temporally stable fluid flow for extended durations.

Main Methods:

  • Utilizing a large pressure differential generated by a curved meniscus in an outlet reservoir.
  • Developing a two-step mathematical model to predict fluid and mass transport.
  • Validating the model with particle tracking experiments.

Main Results:

  • The system achieves steady-state flow rapidly and maintains precise volumetric flow rates for over an hour.
  • Flow rates are controllable via microchannel and reservoir dimensions.
  • Demonstrated application in passive generation of temporally stable chemical gradients.

Conclusions:

  • The developed passive pumping method offers a significant advancement for microfluidic systems.
  • This technique provides precise, long-term flow control, applicable to various micro-total analytical systems.
  • Enables new possibilities for applications requiring stable fluid dynamics, such as gradient generation.