EPR and rheological study of hybrid interfaces in gold-clay-epoxy nanocomposites.

摘要: With the aim to obtain new materials with special properties be used in various industrial and biomedical applications, ternary "gold-clay-epoxy" nanocomposites their nanodispersions were prepared using clay decorated gold nanoparticles (AuNPs), at different contents. Nanocomposites structure was characterized by X-ray diffraction (XRD), scanning electron microscopy (SEM), transmission (TEM). Rheology paramagnetic resonance (EPR) techniques order evaluate molecular dynamics nanodispersions, as well interfaces nanocomposites. The percolation threshold (i.e., filler content related formation of long-range connectivity particles dispersed media) determined ϕp = 0.6 wt % a fixed 3 %. flow activation energy relaxation time spectrum illustrated presence interfacial interactions around above AuNPs; these suppressed global dynamics. It found that below free epoxy polymer chains ratio dominated over attracted on surfaces; thus, rheological behavior not significantly changed AuNPs. While, ϕp, amount bonded surface much higher than chains; substantial increase shift spectra times appeared. EPR signals depended nanoparticle contents preparation procedure thus providing fingerprint nanostructures. results from spin probes indicated main effect form more homogeneous, viscous polar clay-epoxy mixture surface. knowledge obtained this study is applicable understand role combinations nanofillers.