Eletrofiação e caracterização de membranas de acetato de celulose contendo nanopartículas de ouro

Abstract

Electrospinning gained prominence due to its ease of processing, versatility and reproducibility in the development of polymeric membranes. However, the incorporation of nanoparticles to this technique has little explored routes, thus generating many unknowns regarding the characteristics of composites from electrospinning. The present work sought to electrospin and characterize cellulose acetate membranes incorporating gold nanoparticles concomitantly with in situ electrospinning, and after electrospinning via membrane immersion. Electrospinning parameters were pre-established, such as: needle diameter of 0.8 mm, working distance of 18 cm, flow of 12 mL/h, working voltage of 20 kV, working temperature between 26 and 30 °C and relative humidity. between 35 and 40 %. Concentrated solutions of gold nanoparticles synthesized by the Turkevich method were incorporated into the membranes through immersion (50 µL) and in situ (10 µL, 50 µL, 100 µL and 500 µL) routes. The nanoparticles were characterized by UV vis and TEM techniques, which showed stable, monodisperse nanoparticles with spherical geometry and mean diameter of 23.5±2.7 nm. The membranes were characterized by x-ray diffraction, scanning electron microscopy (SEM), wettability, thermal analysis (TG, TGA, DSC) and complex impedance spectroscopy (EIC). The membranes of pure cellulose acetate and functionalized by immersion, showed unique properties in relation to the in situ membrane with 500 µL of nanoparticles. Which showed an increase in electrical conductivity due to the presence of gold in its nanofibers. Thus revealing a unique and promising feature for the application of these membranes.