supplementary material of the article Development of film nanocomposite membranes from nanocrystalline cellulose combined with reduced graphene oxide or graphene oxide: evaluation of potential applications in proton exchange membranes
This section reports complementary data from FT-IR measurements for CNC:GO or CNC:rGO composites using different weigth percentages of carbonaceous frameworks.
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CNC membranes were obtained as follows: the substrate and glass were washed with soap and water, followed by 15 min of sonication using ethanol and a second 15 min treatment with acetone. The GO powders were obtained from graphite employing traditional modified Hummers approach following procedure previously reported (López-Oyama et al., 2018), whereas the rGO was achieved by a thermal reduction at 500 °C. Subsequently, 0.5 and 1.5 wt%/v of NCC solutions were prepared by adding to this GO and rGO under constant stirring for 2 h, which were subjected to an ultrasonic bath to minimize agglomeration with the BRANSON™ 2510 model ultrasonic cleaner. Then, 0.5 mL of these solutions were added onto the glass substrate and molded with an Elcometer 3580 film applicator at room temperature achieving a thickness for all membranes of 120 µm. Absorption-emission analysis of functional groups after each step of chemical treatment was carried oud through Fourier transform infrared analysis (FT-IR). The used equipment for FT-IR analysis was a Perkin Elmer Spectrum One, in a range from 500 to 4000 cm−1