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WEP39 |
Development of a Sticker Sealed Microfluidic Device for In Situ Analytical Measurements Using Synchrotron Radiation | |
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Funding: The authors would like to thank the financial support from CNPq, CAPES, Brazilian Center for Research in Energy and Materials (CNPEM)/29’ summer scholarship program-PBV) and FAPESP Shedding synchrotron light on microfluidic systems, exploring several contrasts in situ/operando at the nanoscale, like X-ray fluorescence, diffraction, luminescence, and absorption, has the potential to reveal new properties and functionalities of materials across diverse areas. In this work, we present the micro-fabrication and characterization of a multifunctional polyester/glass sealed microfluidic device well-suited to combine with analytical X-ray techniques. The device consists of smooth microchannels patterned on glass, where three gold electrodes are deposited into the channels to serve in situ electrochemistry analysis or standard electrical measurements. It has been efficiently sealed through an ultraviolet-sensitive sticker-like layer based on a polyester film, and the burst pressure is determined by pumping water through the microchannel (up to 0.22 MPa). The device potentialities, and its high transparency to X-rays, have been demonstrated by taking advantage of the X-ray nanoprobe Carnaúba/Sirius/LNLS, by obtaining 2D X-ray nanofluorescence maps on the microchannel filled with water and after an electrochemical nucleation reaction. *Whitesides, G. M. Te origins and the future of microfuidics. Nature 442, 368’373. https://doi.org/10.1038/nature05058 (2006). |
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