Nanostructured Modified Electrode for Electrocatalytic Determination of Epinephrine in the Presence of Acetaminophen

Abstract In this paper, a nanostructured modified electrode was fabricated by incorporating of 2,2′-[1,9-nonanediylbis(nitriloethylidyne)]-bishydroquinone (NNH) as a newly synthesized modifier and TiO 2 nanoparticles to the carbon paste (MTCPE) and then was used for the electroanalysis of epinephrine (EP). The electrochemical studies were carried out by using cyclic voltammetry, chronoamperometry and differential pulse voltammetry (DPV) techniques. It has been found that the oxidation of EP at the surface of this electrode occurs at a potential about 235 mV less positive than that of an unmodified carbon paste electrode. A dynamic range of 1.0-2000.0 µM, with a detection limit of 0.37 µM for EP, was obtained using DPV. Also, this modified electrode exhibits well separated oxidation peaks for EP and acetaminophen (AC) using DPV. JNS All rights reserve

INKJET DEPOSITED SILVER NANOPARTICLE ELECTRODES

Silver nanoparticles are being given considerable attention because of their interesting properties and potential applications. One such exploitable use is as the major constituent of conductive inks and pastes used for printing various electronic components. This paper presents a novel direct-writing process for fabrication of the first deposited silver nanoparticles (AgNPs) (50-200nm) electrode via a thermal inkjet printer. In this method, AgNPs were chemically deposited by ejection of ascorbic acid and silver nitrate solutions onto different substrates such as paper and textile fabrics. Silver deposited patterns were used as electrodes in different electrochemical experiments and their morphology was also investigated in SEM observations. The highest conductivity of deposited electrodes obtained on paper as the substrate was found to be around 5.54x105 S/m. Inkjet fabricated electrodes exhibited acceptable electrochemical behavior in experiments designed for measuring the concentration of hydrogen peroxide as a fundamental procedure for early determination of glucose. This novel inkjet silver deposition technique is introduced to be considered as a promising method for ultimate single step fabrication of different electrochemical bio-sensors

Post-fire seismic performance of low-yielding steel plate shear walls system

In this study, the post-fire seismic behaviour of steel structures with a special low-yielding steel plate shear wall system was investigated. Three steel structures of 3, 6, and 9-storey with special moment-resisting steel frames and special low-yielding SPSW were designed according to AISC-360/16, AISC-341/16, and ASCE-07/16 using software CSI ETABS. One 2D frame of each structure was then modelled using the finite element package Abaqus and analysed with the push over method to determine their response modification factors R, an indicator of the nonlinear seismic performance of a structure. The models were validated against experimental testing on a steel plate shear wall system, which showed good agreement. The post-fire mechanical properties of steel were then implemented into the model and the post-fire response modification factors were determined. According to the results, the post-fire response modification factors of the 3, 6, and 9- storey models could respectively be reduced by 14.9%, 15.9%, and 9.0% compared to those before the fire, showing a considerable reduction in the nonlinear seismic performance of the structures. Furthermore, the results showed that higher temperature with more stories exposed to fire followed by air cooling leads to more reduction in seismic capacity, and overall water cooling tends to reduce the seismic capacity less than air cooling. Also, it was indicated that the code25 specified value of R is rather over-conservative for post-fire calculations