Amirkabir University of Technology

About: Amirkabir University of Technology is a education organization based out in Tehran, Iran. It is known for research contribution in the topics: Nonlinear system & Fuzzy logic. The organization has 15254 authors who have published 31165 publications receiving 487551 citations. The organization is also known as: Tehran Polytechnic & Tehran Polytechnic University.

Nanoclay-reinforced electrospun chitosan/PVA nanocomposite nanofibers for biomedical applications

Abstract: Nanofibrous nanocomposites based on a chitosan/poly(vinyl alcohol) blend and Na–montmorillonite (MMT) nanoclays were prepared by the electrospinning technique. The morphological studies of the electrospun mats revealed that uniform bead-free nanofibers were formed. Existence of MMT in the nanofibrous mats was confirmed by FTIR and energy dispersive X-ray scattering (EDX). The high aspect ratio MMT nanoclays were incorporated inside the nanofibers. Small angle X-ray diffraction (SAXRD) measurements showed that the electrospinning process significantly affected the interlayer spacing of the nanoclays. Incorporation of nanoclays into the nanofibers enhanced the tensile strength and increased the glass transition of the mats. The cytotoxicity of the nanocomposite mats was examined by MTT assay using the A-431 cell line. The clay-containing nanofibrous mats did not show any significant effect on the viability of the cells. The A-431 cells were properly attached on the surface of the mats.

Effect of ZnO nanoparticles on the thermal and mechanical properties of epoxy-based nanocomposite

Abstract: Effect of ZnO nanoparticles particles on the mechanical properties and the curing behavior of an epoxy nanocomposite were studied. Nanocomposites were prepared using different loadings of pre-dispersed ZnO nanoparticles having an average size of 40 nm. The surface topography and morphology of the nanocomposites were studied using atomic force microscope (AFM). The mechanical properties of nanocomposites were studied using analytical techniques including dynamic mechanical thermal analysis and micro-Vickers hardness. Effects of ZnO nanoparticles on the curing behavior of these nanocomposites were investigated utilizing isothermal and non-isothermal differential scanning calorimeter techniques. In addition, chemical compositions of coatings containing different ZnO nanoparticles contents were studied using a Fourier transform inferred. It was found that, ZnO nanoparticles can effectively influence the mechanical properties of epoxy coating. In addition, lower curing degrees, and therefore crosslinking density of epoxy coating including higher ZnO nanoparticles were obtained. This effect was completely different at low and high loadings of the particles.