Showing papers by "Abdollah Salimi published in 2012"
TL;DR: It was found that Fe(3)O(4) has redox properties similar to those of frequently used mediators used for electron transfer between NADH and electrode and can be used as an efficient transducer in the design of biosensors based on coupled dehydrogenase enzymes.
125 citations
TL;DR: The modified electrode can be used for simultaneous or individual detection of three major narcotic components, heroin, noscapine and morphine at micromolar concentration without any separation or pretreatment steps.
108 citations
TL;DR: High ability of MWCNTs/IL/Ox-P(NAD(+)) to promote electron transfer between NADH and the electrode suggested a new promising biocompatible platform for development of dehydrogenase-based amperometric biosensors.
59 citations
TL;DR: High selectivity, excellent electrocatalytic activity and stability, remarkable antifouling property toward thiols and their oxidation products, as well as the ability for simultaneous detection of l-cysteine and homocysteine are remarkably advantageous of the proposed DNA based biosensor.
40 citations
TL;DR: In this paper, a glass carbon electrode modified with electrodeposited cobalt oxide nanostructure showed an excellent electrocatalytic activity toward insulin oxidation at a wide pH range.
Abstract: Glassy carbon electrode modified with electrodeposited cobalt oxide nanostructure shows an excellent electrocatalytic activity toward insulin oxidation at a wide pH range. Cyclic voltammetry, hydrodynamic amperometry, and flow injection analysis (FIA) were used for insulin determination at a picomolar and higher-concentration range. Amperometric determination of insulin at this modified electrode yielded a calibration curve with the following characteristics; linear range, 100 pM–15 nM; sensitivity of 83.9 nA nM−1 and detection limit 10 pM. FIA yielded the calibration curve with sensitivity and detection limit of 2.0 nA nM−1 and 25 pM, respectively. Furthermore, the RSD of repetitive FIA for 200 pM insulin (n = 13) is 2%. In addition, the interference effect of electroactive existing species (lactic acid, cholesterol, ascorbic acid, uric acid, and glucose) was eliminated by covering the surface of the modified electrode with nafion film. Fast response time, signal stability, high sensitivity, low cost, and ease of preparation are the advantages of the proposed insulin sensor.
37 citations
TL;DR: A novel, simple and facile layer by layer (LBL) approach is used for modification of glassy carbon electrode with multilayer of catalase and nanocomposite containing 1-(3-Aminopropyl)-3-methylimidazolium bromide (amine terminated ionic liquid (NH(2)-IL)) and titanium nitride nanoparticles (TiNnp).
30 citations
TL;DR: In this paper, a glass carbon electrode modified with electrodeposited nickel oxide nanoparticles (NiOxNPs) was used as electrocatalyst for oxidation of omeprazole and pentoperazole in alkaline solution.
Abstract: Glassy carbon electrode modified with electrodeposited nickel oxide nanoparticles (NiOxNPs) was used as electrocatalyst for oxidation of omeprazole and pentoperazole in alkaline solution The modified electrode exhibited efficient electrocatalytic activity for the oxidation of omeprazole and pentoperazole with relatively high sensitivity, excellent stability, and long lifetime Hydrodynamic amperometric method is used for determination of selected analytes Under optimized condition, the linear concentration range, detection limit, and sensitivity of modified electrode toward omeprazole detection are 45–120 μM, 04 μM (at signal to noise 3), and 401 nA μM−1 cm−2, respectively For pantoperazole, hydrodynamic amperometric determination yielded calibration curve with linear range of 25–180 μM, detection limit of 02 μM, and sensitivity of 392 nA μM−1 cm−2, respectively The proposed method was successfully applied to pentoperazole and omeprazole determination in drug samples
20 citations
TL;DR: In this article, the effect of alternating current (AC) electrodeposition frequency on the magnetic properties of high-density cobalt (Co) nanowires (NWs) was investigated.
Abstract: High-density cobalt (Co) nanowires (NWs) were fabricated using porous anodized aluminum oxide as a template. Measurement results show a high magnetic performance for NWs with a coercivity of about 1750 Oe and strong magnetic anisotropy with an easy axis parallel to the NW direction. We have investigated the effect of alternating current (AC) electrodeposition frequency on the magnetic properties of NW samples. We show that understanding the effect of barrier layer is critical for controlling the rate of NW electrodeposition. A circuit model is proposed that accurately describes the role of the barrier and interfacial layers during deposition. Results obtained by simulation of the circuit show an excellent agreement with experimental results for different frequencies and voltages. It is shown that the amount of electrodeposited material can be estimated based on the difference between the anodic and cathodic half cycles in the electrodeposited current. Use of higher frequency leads to more symmetrical half cycles and smaller electrodeposited material.
16 citations
Journal Article•
TL;DR: In this article, an intelligent system for online tool condition monitoring in drilling process is presented, where analytical and empirical models have been used to predict the thrust and cutting forces on the lip and chisel edges of a new drill.
Abstract: In automation flexible manufacturing systems, tool wear detection during the cutting process is one of the most important considerations. This study presents an intelligent system for online tool condition monitoring in drilling process .In this paper, analytical and empirical models have been used to predict the thrust and cutting forces on the lip and chisel edges of a new drill. Also an empirical model is used to estimate tool wear rate and force values on the edges of the worn drill. By using of the block diagram of machine tool drives, the changes in the feed and spindle motor currents are simulated, as wear rate increases. To predict tool wear rate in drill, Fuzzy logic capabilities have been used to develop intelligent system. The simulated results presented in MATLAB software show the effectiveness of the proposed system for on-line drill wear monitoring.