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19 January 2006 A microfluidic sensor for dynamic surface tension measurement
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This paper reports on a hybrid polymeric microfluidic device with optical detection for droplet-based systems. The optical part of the device is integrated by a hybrid concept. The microfluidic structures were fabricated using CO2 laser on PMMA (poly methylmethacrylate) substrate. The microfluidic network consists of two microchannels for forming droplets of an aqueous liquid in an immiscible carrier liquid. The optical component consists of two optical fibers for guiding laser light from the source, through the detection point, to a photo diode. The formed droplets pass the detection point and diffract the incoming laser light. The detected signal at the photo diode can be used for evaluating droplet size, droplet shape, and droplet formation frequency. The device can detect very high formation frequencies, which are not detectable using a conventional CCD camera/microscope setup.
© (2006) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Nam-Trung Nguyen, Franck Alexis Chollet, and Chun Yang "A microfluidic sensor for dynamic surface tension measurement", Proc. SPIE 6036, BioMEMS and Nanotechnology II, 60360M (19 January 2006);

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