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7 May 2007 Characterization of new thermo-responsive hydrogels for optical sensing applications
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We report the use of new hydrogels based on poly-N-isopropylacrilamide and MeOXA in order to measure temperature using optical transmittance. We have obtained thermo-responsive hydrogels based on the radical copolymerization of N-isopropylacrylamide (NIPAAm) and bis-macromonomers of 2-methyl-2-oxazoline (MeOXA). The hydrogels show conformational transitions at defined temperatures, which are a function of the molar ratio NIPAAm / MeOXA inside of the hydrogel. The temperatures of transition have been determined by means of 1H NMR spectroscopy and by turbidity measurements using an optical setup with optical fibers and a diode laser. We show the first experimental results and we discuss some future applications such as an optical switch or a device for optical sensing.
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Juan Carlos Rueda, Kevin Contreras, Rafael Coello, Mauro Lomer, Hartmut Komber, Stefan Zschoche, and Brigitte Voit "Characterization of new thermo-responsive hydrogels for optical sensing applications", Proc. SPIE 6572, Enabling Photonics Technologies for Defense, Security, and Aerospace Applications III, 65720T (7 May 2007);

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