Valves for autonomous capillary systems
Autonomous capillary systems (CSs) are microfluidic systems inside which liquids move owing to capillary forces. CSs can in principle bring the high-performances of microfluidic-based analytical devices to near patient and environmental testing applications. In this paper, we show how wettable capil...
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Veröffentlicht in: | Microfluidics and nanofluidics 2008-09, Vol.5 (3), p.395-402 |
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creator | Zimmermann, M. Hunziker, P. Delamarche, E. |
description | Autonomous capillary systems (CSs) are microfluidic systems inside which liquids move owing to capillary forces. CSs can in principle bring the high-performances of microfluidic-based analytical devices to near patient and environmental testing applications. In this paper, we show how wettable capillary valves can enhance CSs with novel functionalities, such as delaying and stopping liquids in microchannels. The valves employ an abruptly changing geometry of the flow path to delay a moving liquid filling front in a wettable microchannel. We show how to combine delay valves with capillary pumps, prevent shortcuts of liquid along the corners of microfluidic channels, stop liquids filling microchannels from a few seconds to over 30 min, trigger valves using two liquid fronts merging, and time a liquid using parallel microfluidic paths converging to a trigger valve. All together, these concepts should add functionality to passive microfluidic systems without departing from their initial simplicity of use. |
doi_str_mv | 10.1007/s10404-007-0256-2 |
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CSs can in principle bring the high-performances of microfluidic-based analytical devices to near patient and environmental testing applications. In this paper, we show how wettable capillary valves can enhance CSs with novel functionalities, such as delaying and stopping liquids in microchannels. The valves employ an abruptly changing geometry of the flow path to delay a moving liquid filling front in a wettable microchannel. We show how to combine delay valves with capillary pumps, prevent shortcuts of liquid along the corners of microfluidic channels, stop liquids filling microchannels from a few seconds to over 30 min, trigger valves using two liquid fronts merging, and time a liquid using parallel microfluidic paths converging to a trigger valve. 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subjects | Analytical biochemistry: general aspects, technics, instrumentation Analytical Chemistry Analytical, structural and metabolic biochemistry Applied fluid mechanics Biological and medical sciences Biomedical Engineering and Bioengineering Engineering Engineering Fluid Dynamics Environmental testing Exact sciences and technology Fluid dynamics Fluidics Fundamental and applied biological sciences. Psychology Fundamental areas of phenomenology (including applications) Nanotechnology and Microengineering Physics Research Paper Valves |
title | Valves for autonomous capillary systems |
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