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Floryan, Caspar Jerzy

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Floryan

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Caspar Jerzy

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Floryan, Caspar Jerzy

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2012 - 20132

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Author's Publications: search.filters.isAuthorOfPublication.5101fab9-cbef-4dfa-b72a-394b921ecc52

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    Microwave dielectric heating of non-aqueous droplets in a microfluidic device for nanoparticle synthesis
    (Royal Society of Chemistry (RSC), 2013) Koziej, Dorota; Floryan, Caspar Jerzy; Sperling, Ralph A.; Ehrlicher, Allen Joseph; Issadore, David; Westervelt, Robert; Weitz, David
    We describe a microfluidic device with an integrated microwave heater specifically designed to dielectrically heat non-aqueous droplets using time-varying electrical fields with the frequency range between 700 and 900 MHz. The precise control of frequency, power, temperature and duration of the applied field opens up new vistas for experiments not attainable by conventional microwave heating. We use a non-contact temperature measurement system based on fluorescence to directly determine the temperature inside a single droplet. The maximum temperature achieved of the droplets is 50 °C in 15 ms which represents an increase of about 25 °C above the base temperature of the continuous phase. In addition we use an infrared camera to monitor the thermal characteristics of the device allowing us to ensure that heating is exclusively due to the dielectric heating and not due to other effects like non-dielectric losses due to electrode or contact imperfection. This is crucial for illustrating the potential of dielectric heating of benzyl alcohol droplets for the synthesis of metal oxides. We demonstrate the utility of this technology for metal oxide nanoparticle synthesis, achieving crystallization of tungsten oxide nanoparticles and remarkable microstructure, with a reaction time of 64 ms, a substantial improvement over conventional heating methods.
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    Automating Microfluidics: Reconfigurable Virtual Channels for Cell and Droplet Transport
    (2012-07-17) Floryan, Caspar Jerzy; Nemiroski, Alex; Westervelt, Robert
    The emerging field of digital microfluidics promises to solve many shortcomings of traditional continuous-flow fluidics. This technology has a few incarnations, including EWOD (eletrowetting on dielectric) and DEP (dielectrophoresis) chips. Both consist of large arrays of electrical pixels which move droplets and cells. They actuate fluids actively, have error feedback, are programmable, perform operations in parallel, and do not rely on external pumps. For these reasons we foresee the increased use of digital microfluidics in the near future. We also foresee a gradual shift away from purpose-built microfluidic devices, towards multi-purpose platforms with specific applications encoded in software. To this extent we present here a new paradigm of encoding and automating microfluidic operations using video files. We use this technology to create several configurations of virtual microfluidic channels and to play film clips using living cells on a DEP chip.