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

Published on: September 2, 2009

Light-governed capillary flow in microfluidic systems.

Li Jiang1, David Erickson

  • 1Cornell University, 240 Upson Hall, Ithaca, New York 14853, USA.

Small (Weinheim an Der Bergstrasse, Germany)
|September 28, 2012
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel light-operated flow system for point-of-care devices. This system utilizes a smart polymer and light-to-heat conversion for precise fluid control, ideal for low-resource settings.

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Capillary-based Centrifugal Microfluidic Device for Size-controllable Formation of Monodisperse Microdroplets

Published on: February 22, 2016

Area of Science:

  • Materials Science
  • Biomedical Engineering
  • Polymer Science

Background:

  • Point-of-care (POC) devices require efficient and low-cost fluid handling systems.
  • Existing microfluidic systems often rely on complex and expensive components.
  • Harnessing light, particularly sunlight, offers a sustainable and simple power source for portable diagnostics.

Purpose of the Study:

  • To introduce a novel light-operated method for driving fluid flow in microfluidic systems.
  • To demonstrate the use of a smart polymer and light-responsive materials for flow control.
  • To assess the feasibility of this technology for low-resource point-of-care applications.

Main Methods:

  • Grafting poly(N-isopropylacrylamide) (PNIPAM), a thermoresponsive polymer, onto a carbon black-polydimethylsiloxane (PDMS) composite surface.
  • Utilizing the surface's ability to convert light into localized thermal patterns.
  • Investigating the temperature-dependent wettability changes of PNIPAM to control fluid flow and valving.

Main Results:

  • Demonstrated tunable flow rates ranging from 4 μL/min at 25°C to 0.1 μL/min at 40°C.
  • Characterized valving dynamics, achieving a response time of less than 4 seconds.
  • Confirmed light-induced thermal patterning effectively controlled fluid flow at specific locations.

Conclusions:

  • A simple, light-operated flow system was successfully developed using smart polymer technology.
  • This approach offers a low-cost, high-functionality solution for fluid control in portable diagnostic devices.
  • The technology holds significant potential for advancing point-of-care diagnostics in resource-limited environments.