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Infrared controlled waxes for liquid handling and storage on a CD-microfluidic platform
Abi-Samra, Kameel,Hanson, Ryan,Madou, Marc,Gorkin III, Robert A. Royal Society of Chemistry 2011 Lab on a chip Vol.11 No.4
<P>A novel active valving technique, whereby paraffin wax plugs in microchannels on a centrifugal microfluidic platform are actuated using focused infrared (IR) radiation is demonstrated in this report. Microchannels were simultaneously or sequentially opened using a stationary IR source by forming wax plugs with similar or differing melting points. The presented wax plugs offer key advantages over current active valving techniques, including a less involved fabrication procedure, a simpler actuation process, and the ability to multiplex experiment with active valves. In addition, a new technique for automated liquid reagent storage and release on the microfluidic disc platform, based on the formation and removal of a wax layer, is demonstrated. Overall, the techniques presented in this report offer novel methods for liquid handling, separation, and storage on the centrifugal microfluidic disc platform.</P> <P>Graphic Abstract</P><P>Novel fluid handling and storage techniques for the centrifugal microfluidic disc platform based on non-contact actuation of paraffin wax plugs <I>via</I> infrared radiation. <IMG SRC='http://pubs.rsc.org/services/images/RSCpubs.ePlatform.Service.FreeContent.ImageService.svc/ImageService/image/GA?id=c0lc00160k'> </P>