Inhibition of corrosion of aluminum in alkaline solution by a novel azo-schiff base: Experiment and theory

Arjomandi, Jalal,Moghanni-Bavil-Olyaei, Hamed,Parvin, Mohammad Hadi,Lee, Jin Yong,Chul Ko, Kyoung,Joshaghani, Mohammad,Hamidian, Kourosh Elsevier 2018 JOURNAL OF ALLOYS AND COMPOUNDS Vol.746 No.-

<P><B>Abstract</B></P> <P>The inhibition effect of a Schiff base with several functional groups on the corrosion of aluminum in alkaline solution is studied by experimental techniques and density function theory (DFT) calculations. The Schiff base are characterized by <SUP>1</SUP>HNMR, <SUP>13</SUP>CNMR, FT-IR, and CHN elemental analysis. In addition, different electrochemical and corrosion techniques such as weight loss, tafel polarization, electrochemical impedance spectroscopy (EIS) and optical microscopy images are performed to analyze the inhibiting performances. In the Tafel measurements the cathodic Tafel slopes values incurred small changes with increasing the inhibitor concentration, which revealed that the inhibitor was adsorbed on the aluminum surface. The inhibition efficiencies are calculated from weight loss measurement and electrochemical tests. The adsorption of the inhibitor onto the aluminum surface follows the Langmuir adsorption isotherm with the free adsorption energy of −8.66 kJ mol<SUP>−1</SUP>. The calculated adsorption energies and the amount of charge transfer obtained by DFT calculation revealed that corrosion inhibition effectively occurs with chemisorption, where new NAl bonds are formed between of N atoms in azo (–NN–) group and Al surface atoms, which is confirmed from <I>ab initio</I> molecular dynamics (AIMD) simulation.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Novel Schiff base were synthesized as inhibitor for Al corrosion in alkaline. </LI> <LI> The Schiff base were characterized by <SUP>1</SUP>HNMR, <SUP>13</SUP>CNMR, FT-IR, and CHN. </LI> <LI> The inhibition effect of Schiff base were studied by experimental and DFT. </LI> <LI> The adsorption of inhibitor on Al surface follows Langmuir adsorption isotherm. </LI> <LI> The corrosion inhibitions is chemisorptions which confirmed by AIMD simulation. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Spectroelectrochemistry and electrosynthesis of polypyrrole supercapacitor electrodes based on gamma aluminum oxide and gamma iron (III) oxide nanocomposites

Arjomandi, Jalal,Lee, Jin Yong,Ahmadi, Fatemeh,Parvin, Mohammad Hadi,Moghanni-Bavil-Olyaei, Hamed Elsevier 2017 ELECTROCHIMICA ACTA Vol.251 No.-

<P><B>Abstract</B></P> <P>Polypyrrole (PPy) and polypyrrole-based gamma aluminum oxide (γ-Al<SUB>2</SUB>O<SUB>3</SUB>) and gamma iron (III) oxide (γ-Fe<SUB>2</SUB>O<SUB>3</SUB>) nanocomposites were synthesized via <I>in situ</I> electropolymerization methods Films were characterized via cyclic voltammetry (CV) and <I>in situ</I> spectroelectrochemistry methods such as <I>in situ</I> UV–Visible spectroscopy and <I>in situ</I> conductivity measurements. Polymer nanocomposite structures and morphologies were studied and characterized via Fourier transform infrared (FT-IR) spectroscopy, electrochemical impedance spectroscopy (EIS), energy dispersive X-ray spectroscopy (EDX), scanning electron microscopy (SEM), and transmission electron microscopy (TEM). According to the CV results of the nanocomposites, the separation of anodic and cathodic peak potential of the redox couples (ΔE) exhibited good reversibility with a positive potential shift compared with PPy during redox sweeps. The electrochemical properties of PPy, PPy/γ-Fe<SUB>2</SUB>O<SUB>3,</SUB> and PPy/γ-Al<SUB>2</SUB>O<SUB>3</SUB> nanocomposite electrodes in a solution of H<SUB>2</SUB>SO<SUB>4</SUB> were studied via CV, galvanostatic charge–discharge, and EIS measurements to understand the pseudocapacitance that formed due to oxidation and reduction reactions over the double layer capacitance. Results for the nanocomposites revealed that they were very good candidates for supercapacitor applications, with higher specific capacitances, cyclic self-stabilities, and better rate capabilities than those of PPy films. The specific capacitance values of PPy/γ-Fe<SUB>2</SUB>O<SUB>3</SUB> (106F/g) and PPy/γ-Al<SUB>2</SUB>O<SUB>3</SUB> (92F/g) nanocomposites based on a three-electrode cell configuration from galvanostatic charge–discharge at a constant current density of 1A/g were higher than that for PPy (75F/g).</P> <P><B>Highlights</B></P> <P> <UL> <LI> Polypyrrole based γ-Al<SUB>2</SUB>O<SUB>3</SUB> and γ-Fe<SUB>2</SUB>O<SUB>3</SUB> nanocomposites were synthesized. </LI> <LI> The structure and morphology of the polymer nanocomposites were studied. </LI> <LI> Nanocomposites were characterized by <I>in situ</I> spectroelectrochemistry methods. </LI> <LI> PPy and polymer nanocomposites were applied as supercapacitor materials. </LI> <LI> The specific capacitance values of nanocomposites were higher than that of PPy. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Polyaniline/aluminum and iron oxide nanocomposites supercapacitor electrodes with high specific capacitance and surface area

Arjomandi, Jalal,Lee, Jin Yong,Movafagh, Raheleh,Moghanni-Bavil-Olyaei, Hamed,Parvin, Mohammad Hadi Elsevier 2018 Journal of electroanalytical chemistry Vol.810 No.-

<P><B>Abstract</B></P> <P>We introduce high-performance polyaniline (PANI) nanocomposite supercapacitors based on gamma aluminum oxide (γ-Al<SUB>2</SUB>O<SUB>3</SUB>) and gamma iron (III) oxide (γ-Fe<SUB>2</SUB>O<SUB>3</SUB>) nanoparticles with a high specific surface area. PANI and its polymer nanocomposites are synthesized <I>via in situ</I> electropolymerization on gold electrodes. The structures and morphologies are characterized by cyclic voltammetry, FT-IR spectroscopy, SEM, TEM, and EDX. The electrochemical properties and specific surface area of the electrodes are investigated by galvanostatic charge–discharge, electrochemical impedance spectroscopy (EIS) and BET theory. The enhanced specific capacitance with higher surface area and conductivities is observed in PANI/γ-Fe<SUB>2</SUB>O<SUB>3</SUB> (342F/g), PANI/γ-Al<SUB>2</SUB>O<SUB>3</SUB> (292F/g) and PANI (180F/g) electrodes with a constant current density of 1A/g. The cyclic performance of the PANI electrodes following 8000cycles of operations were at 87% (PANI), 91% (PANI/γ-Al<SUB>2</SUB>O<SUB>3</SUB>), and 93% (PANI/γ-Fe<SUB>2</SUB>O<SUB>3</SUB>) of their initial capacitance. In addition, higher specific capacitances, higher conductivity and cyclic self-stabilities observed for the PANI/nanocomposite electrodes can provide new opportunities in the field of energy storage and supercapacitor applications.</P> <P><B>Highlights</B></P> <P> <UL> <LI> PANI with γ-Al<SUB>2</SUB>O<SUB>3</SUB> and γ-Fe<SUB>2</SUB>O<SUB>3</SUB> supercapacitors were fabricated. </LI> <LI> Samples were characterized by <I>in situ</I> method, FT-IR, SEM, EDX, TEM, BET and EIS. </LI> <LI> Charging-discharging behavior of the electrodes was investigated. </LI> <LI> The specific capacitance values of PANI/nanocomposites were higher than that of PANI. </LI> <LI> Polymer nanocomposites show higher surface area and stability with long cycle life. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Reduced graphene Oxide/Poly(1,5 dihydroxynaphthalene)/TiO₂ nanocomposite conducting polymer coated on gold as a supercapacitor electrode

Azizi, Elmira,Arjomandi, Jalal,Lee, Jin Yong Elsevier 2019 ELECTROCHIMICA ACTA Vol.298 No.-

<P><B>Abstract</B></P> <P>A novel reduced graphene oxide/poly(1,5-dihydroxynaphthalene)/TiO<SUB>2</SUB> (RGO/PDHN/TiO<SUB>2</SUB>) ternary nanocomposite conducting polymer is electrochemically synthesized on gold electrodes for supercapacitor applications. The RGO/PDHN/TiO<SUB>2</SUB> nanocomposite polymer film is characterized by field-emission scanning electron microscopy (FESEM), Fourier transform infrared spectra (FT-IR), and energy dispersive X-ray spectrometry (EDX) and X-ray diffraction (XRD). The electrochemical performance of the nanocomposite polymer-modified electrode in 1.0 M HClO<SUB>4</SUB> is investigated by various electrochemical methods such as cyclic voltammetry (CV), galvanostatic charge-discharge, and electrochemical impedance spectroscopy (EIS). The RGO/PDHN/TiO<SUB>2</SUB> nanocomposite polymer film in a three-electrode system exhibits a large specific capacitance of 556 F g<SUP>−1</SUP> in comparison with those obtained using RGO/PDHN (432 F g<SUP>−1</SUP>) and PDHN (223 F g<SUP>−1</SUP>) at a current density of 2.4 A g<SUP>−1</SUP>. Simultaneous usage of the electrical double layer capacitance (EDLC) of RGO with the pseudocapacitive behavior of PDHN and TiO<SUB>2</SUB> results in the large specific capacitance in RGO/PDHN/TiO<SUB>2</SUB>. The electrochemical self-stabilities of RGO/PDHN/TiO<SUB>2</SUB>, RGO/PDHN, and PDHN polymer films are investigated by continuous cycling between −0.20–0.45 V. The RGO/PDHN/TiO<SUB>2</SUB> nanocomposite yields longer self-stability than that of other polymers after 1700 cycles and maintains about 74% of the initial capacitance values.</P>

WIND DATA ANALYSIS FOR DYNAMIC STALL PREDICTION FOR WIND TURBINES

Amanullah Choudhry,Maziar Arjomandi,Richard Kelso 한국신재생에너지학회 2011 AFORE Vol.2011 No.-

ENHANCED CONCENTRATED SOLAR RECEIVER EFFICIENCY THROUGH THE USE OF METALLIC PARTICLES

M. R.I. Sarker,Dahe Gu,M. Arjomandi,B.B. Dally 한국신재생에너지학회 2011 AFORE Vol.2011 No.-

Heat transfer and fluid flow of MgO/ethylene glycol in a corrugated heat exchanger

H. Arya,M. M. Sarafraz,M. Arjomandi 대한기계학회 2018 JOURNAL OF MECHANICAL SCIENCE AND TECHNOLOGY Vol.32 No.8

The present work aims to investigate the thermo-hydraulic performance of a counter-current corrugated plate heat exchanger working with MgO/ethylene glycol nanofluid. MgO nanoparticles were dispersed in ethylene glycol at different weight (mass) concentrations of 0.1 %, 0.2 % and 0.3 % and nanofluids were introduced to a heat exchanger in form of a counter-current flow to exchange heat with water. The test rig provided conditions to measure the influence of different operating parameters such as fluid flow, mass concentration and inlet temperature of the nanofluid on heat transfer coefficient, pressure drop, and thermal performance index of the heat exchanger. Results showed that flow rate and mass concentration can intensify the convective heat transfer coefficient. However, they both increase the pressure drop of the system. The heat transfer coefficient, pressure drop was found to be enhanced by 35 % and 85 %, respectively at wt.% = 0.3. Interestingly, inlet temperature was found to only increase the heat transfer coefficient slightly (up to 9.8 % at wt.% = 0.3) and had no influence on the values of pressure drop. The presence of MgO nanoparticles was found to increase the thermo-hydraulic performance index of the heat exchanger by 34 %.

Highly sensitive and selective electrochemical sensor for detection of vitamin B12 using an Au/PPy/FMNPs@TD-modified electrode

Parvin, Mohammad Hadi,Azizi, Elmira,Arjomandi, Jalal,Lee, Jin Yong Elsevier 2018 Sensors and actuators. B Chemical Vol.261 No.-

<P><B>Abstract</B></P> <P>A new electrochemical sensor for sensitive and selective detection of vitamin B12 (VB12) was constructed by the electropolymerization of pyrrole (Py) in the presence of ferromagnetic nanoparticle-incorporated triazine dendrimer (FMNPs@TD) on a gold electrode (Au). The gold/polypyrrole/ferromagnetic nanoparticles/triazine dendrimer (Au/PPy/FMNPs@TD) electrode showed electrocatalytic activity for the reduction of VB12 in Britton-Robinson buffers. The performance and interaction of the Au/PPy/FMNPs@TD with VB12 were investigated by cyclic voltammetry (CV), electrochemical impedance spectroscopy (EIS), differential pulse voltammetric (DPV), UV–vis spectroelectrochemistry, and density functional theory calculations. The resulting sensor exhibited excellent performance for determination of VB12 with a wide linear range (2.50 nM–0.5 μM), highly reproducible response (RSD of 2.3%), low percentage of interferences, and long-term stability. The limit of detection (LOD) and limit of quantitation (LOQ) values for the determination of VB12 were 0.91 and 3.00 nM, respectively. The electron transfer rate constants (k<SUB>s</SUB>), charge transfer coefficient (α), surface concentrations of electroactive species (Г), and disproportionation equilibrium constant (K<SUB>D</SUB>) for Au/PPy/FMNPs@TD-modified electrodes were calculated. Finally, the constructed sensor was applied to the determination of VB12 in food samples.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A highly sensitive and selective sensor for detection of VB12 was fabricated. </LI> <LI> The sensor showed electrocatalytic activity for the reduction of VB12. </LI> <LI> The VB12 sensor exhibited long term stability and highly reproducible response. </LI> <LI> The LOD and LOQ values for the determination of VB12 were 0.91 and 3.00 nM. </LI> <LI> The sensor was applied to the determination of VB12 in food samples. </LI> </UL> </P> <P><B>Graphical abstract</B></P> <P>[DISPLAY OMISSION]</P>

Oncology Nurses Knowledge and Attitudes Regarding Cancer Pain Management

Shahriary, Shahdad,Shiryazdi, Seyed Mostafa,Shiryazdi, Seyed Ali,Arjomandi, Amir,Haghighi, Fatemeh,Vakili, Fariba Mir,Mostafaie, Naiemeh Asian Pacific Journal of Cancer Prevention 2015 Asian Pacific journal of cancer prevention Vol.16 No.17

Background: Oncology nurses play a crucial role in cancer pain management and must be highly informed to ensure their effective practice in the cancer setting. The aim of this study was to determine the baseline level of knowledge and attitudes of oncology nurses regarding cancer pain management. Materials and Methods: A cross-sectional survey research design was employed. The sample comprised 58 cancer nurses working in Shahid Sadoughi hospital, Yazd, Iran. The "Nurses Knowledge and Attitudes Survey Regarding Pain" (NKAS) tool and a demographic form were utilized to ascertain the knowledge and attitudes of oncology nurses working in oncology settings. Results: The average correct response rate for oncology nurses was 66.6%, ranging from 12.1% to 94.8%. The nurses mean score on the knowledge and attitudes survey regarding pain management was 28.5%. Results revealed that the mean percentage score overall was 65.7%. Only 8.6% of nurse participants obtained a passing score of 75% or greater. Widespread knowledge deficits and poor attitudes were noted in this study, particularly regard pharmacological management of pain. Conclusions: The present study provides important information about knowledge deficits in pain management among oncology nurses and limited training regarding pain management. Our results support the universal concern of inadequate knowledge and attitudes of nurses regarding cancer pain. It is suggested educational and quality improvement initiatives in pain management could enhance nurses knowledge in the area of pain and possibly improve practice.