Immobilization of metal nanoparticles on polyurethane membranes: synthesis and electrical properties

Abstract

Ag and Cu nanoparticles were immobilized into crosslinked polyurethane (PU) membranes by taking advantage of the swelling characteristics of the membranes. The formation, shape and size of the nanoparticles inside the post‐swollen PU membranes were observed by transmission electron microscopy and atomic force microscopy. X‐ray diffraction indicated the presence of the pure Ag and Cu embedded in the amorphous PU matrix. Because of their compatibility, the nanoparticles improved the thermal stability and increased the glass transition temperature of PU. The membranes exhibited interesting conducting behavior with increasing temperature. The metal immobilization increased the ionic conductivity which further increased with temperature, with an activation energy of 0.15 eV indicating a thermally activated conduction mechanism. The optical and electrical properties of these starch‐based membranes can be utilized in the development of novel sensors for biomedical applications. Copyright © 2012 Society of Chemical Industry

New polymeric/inorganic hybrid sorbents based on red mud and nanosized magnetite for large scale applications in As(V) removal

“…Silica gel [24][25][26] and polyurethane foam [27,28] have been successfully use for immobilization in other studies, so they were tested in the present work. However, using these supporting materials arsenic elimination resulted completely inhibited and for this reason data were not included in Figure 4.…”

Anomalous electrical properties of poly vinyl alcohol films with Tb3+ ions and copper nanoparticles in different solvents

“…7,8 The fabrication process plays an important role in the properties of nanoparticles such as crystallite size, shape and particle size distribution. 18,19 The electrical behaviour of doped copper nanoparticles in polyurethane has been studied by Valodkar et al 20 Frequencydependent conductivity and its variation with temperature was the focus of their study. Various methods are used for the preparation of NPs.…”

Nanosized cellulose derivatives as green reinforcing agents at higher loadings in natural rubber

“…Our group has focused on highlighting the reinforcing ability of various polysaccharides, including starch, by employing commercial mixing methods . Starch derivatives have been found to induce excellent reinforcement in NR up to filler loadings of 30 phr.…”

“…Our group has focused on highlighting the reinforcing ability of various polysaccharides, including starch, by employing commercial mixing methods. [21][22][23] Starch derivatives have been found to induce excellent reinforcement in NR up to filler loadings of 30 phr. In this study, the development of nanocomposites highly filled (>50 phr) with cellulosic fillers was attempted.…”