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Danaee, I.,Bahramipanah, N.,Moradi, S.,Nikmanesh, S. The Korean Electrochemical Society 2016 Journal of electrochemical science and technology Vol.7 No.2
The inhibition ability of N,N-bis(2,4-dihydroxyhydroxybenzaldehyde)-1,3-Propandiimine (DHBP) as a schiff base against the corrosion of API-5L-X65 steel in 1 M HCl solution was evaluated by electrochemical impedance spectroscopy, potentiodynamic polarization and scanning electron microscopy. Electrochemical impedance studies indicated that DHBP inhibited corrosion by blocking the active corrosion sites. The inhibition efficiency increased with increasing inhibitor concentrations. EIS data was analysed to equivalent circuit model and showed that the charge transfer resistance of steel increased with increasing inhibitor concentration whilst the double layer capacitance decreased. The adsorption of this compound obeyed the Langmuir adsorption isotherm. Gibbs free energy of adsorption was calculated and indicated that adsorption occurred through physical and spontaneous process. The corrosion inhibition mechanism was studied by potential of zero charge. Polarization studies indicated that DHBP retards both the cathodic and anodic reactions through adsorption on steel surface. Scanning electron microscopy was used to study the steel surface with and without inhibitor.
A Kinetic Investigation of Ethanol Oxidation on a Nickel Oxyhydroxide Electrode
Danaee, I.,Jafarian, M.,Sharafi, M.,Gobal, F. The Korean Electrochemical Society 2012 Journal of electrochemical science and technology Vol.3 No.1
Nickel modified NiOOH electrodes were used for the electrocatalytic oxidation of ethanol in alkaline solutions where the methods of cyclic voltammetry (CV) and chronoamperometry (CA) were employed. In CV studies, in the presence of ethanol, an increase in the current for the oxidation of nickel hydroxide is followed by a decrease in the corresponding cathodic current. This suggests that the oxidation of ethanol is being catalysed through mediated electron transfer across the nickel hydroxide layer comprising of nickel ions of various valence states. Under the CA regime the reaction followed a Cottrellian behavior and the diffusion coefficient of ethanol was found to be $1{\times}10^7cm^2s^{-1}$.
Elham Danaee,Younes Mostofi,Pezham Moradi 한국원예학회 2011 Horticulture, Environment, and Biotechnology Vol.52 No.2
The effect of gibberellic acid (GA3) and benzyladenine (BA) on the postharvest quality and vase life of gerbera cut-flowers was investigated. Freshly cut flower stems of gerbera cultivar ‘Good Timing’, with four outer disc florets open, were put in vases containing 0, 50, 100, 150, 200, or 300 mg・L-1 GA3 and 0, 10, 25, 50, 100, or 150 mg・L-1 of BA for 48 hr and then held in vases containing 2.5% ethanol and 3% sucrose. Vases were placed in chambers at 25℃ with a relative humidity about 70% and were arranged in a Completely Randomized Design with three replicates. Data were recorded for vase life, fresh weight, solution uptake, membrane stability, total soluble solid over time and analyzed statistically. GA3 50 mg・L-1 and BA 50 mg・L-1 were the most effective treatments on vase life, fresh weight, solution uptake, membrane stability and total soluble solids of gerbera cut flowers. Cytokinins and gibberelins have potential to enhance post harvest quality of cut gerbera flowers.
I. Danaee,M. Gholami,M. RashvandAvei,M.H. Maddahy 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.26 No.-
The interaction and corrosion inhibition properties of 2-aminobenzothiazole and its different configurations on steel in 1 M H2SO4 were studied by electrochemical and computational calculations. A quantum chemical approach was used to calculate electronic properties of 2-ABT and its different configurations to ascertain the relationship between inhibitive effect and molecular structure. The quantitative structure activity relationship approach was also used to correlate the quantum chemical parameters with experimentally determined inhibition efficiencies. Polarization studies showed that 2- ABT blocked the electrode surface by the adsorption of inhibitor molecules obeying Langmuir isotherm. In addition, the activation and thermodynamic parameters of adsorption were calculated.
Assessment of phosphorescent paint effects on microalgae cultivation
Soroosh Danaee,Nima Yazdanbakhsh,Hamed Naghoosi,Ali Sheykhinejad 한국화학공학회 2018 Korean Journal of Chemical Engineering Vol.35 No.5
Light is the most important factor involved in the growth of photosynthetic organisms, and low efficiency of artificial light systems imposes higher cultivation costs. Phosphorescent paints can emit light for a few hours, and so may be appropriate to accumulate scattered light. In this study, the effects of blue and green phosphorescent paints on growth rate, biomass production and chlorophyll content of three different microalgae, Scenedesmus dimorphus, Chlamydomonas reinhardtii and Chlorella vulgaris were investigated. These strains were cultivated in broth medium in three glass bowls. Half of the first two bowls was stained with blue or green phosphorescent paints (B and G treatment), while the third one was unstained and used as the control (C treatment). All measured parameters were higher in B. The results indicate that partial staining of culturing bowls by blue phosphorescent paint can be an economic approach to increase light efficiency in cultivating microalgae.
Acceleration of microalgal biofilm formation on PET by surface engineering
Soroosh Danaee,Hamideh Ofoghi,Seyed Mohammad Heydarian 한국화학공학회 2021 Korean Journal of Chemical Engineering Vol.38 No.12
Biofilm-based microalgal cultivation has recently received great attention owing to its low harvesting cost, but the main problem in practicing it is the low rate of attachment on solid carriers. The aim of this research is to introduce novel physical and wet chemical surface engineering methods to provide more favorable polymeric surfaces for microalgal adhesion. PET threads were used as a substrate in the treatments. The surface of the threads was treated with chromic acid, sodium hydroxide and sandpaper. The chemical composition, surface morphology, topography and contact angle of the threads were characterized. The threads were placed in a biofilm-based cylindrical photobioreactor as a bed for attachment. Two freshwater single-cell microalgae, Scenedesmus dimorphus and Chlorella vulgaris, were cultivated in the photobioreactor to assess the attachment rate of the threads. The analysis of SEM and AFM images confirmed the creation of new grooves. The AFM image analysis showed 323%, 184% and 11.5% increase in the surface roughness, while there were 73%, 51%, and 30% rates of reduction in the contact angles for the treatments with acid, sandpaper and base, respectively. Creation of new grooves, increase of the surface roughness and decrease of the contact angle led to an increase in the microalgae attachment rate. The best results were achieved with acid treatment. It led to a remarkable increase in the attachment rate of S. dimorphus. However, the attachment of C. vulgaris cells was not efficient. This research is the first to apply a surface engineering method to increase the microalgal attachment rate in biofilm-based systems. The insight that is provided can be of benefit for further studies in this field.
2D–3D nucleation and growth of palladium on graphite electrode
Iman Danaee 한국공업화학회 2013 Journal of Industrial and Engineering Chemistry Vol.19 No.3
Nucleation and growth of palladium on graphite electrode was studied by electrochemical techniques. Crossovers in cyclic voltammograms demonstrate that the deposition of palladium proceed via a nucleation/growth mechanism. In the early stage of the deposition, two-dimensional (2D–3D)nucleation and growth proceeding through instantaneous and a multitude of progressive steps followed the initial double layer charging. Non-linear fitting methods were applied to obtain the kinetic parameters in the light of Bewick, Fleischmann, and Thirsk theory for 2D and Armstrong, Fleischmann,and Thirsk model for 3D nucleation and growth process.
Havashinejadian, E.,Danaee, I.,Eskandari, H.,Nikmanesh, S. The Korean Electrochemical Society 2017 Journal of electrochemical science and technology Vol.8 No.2
Electrochemical noise signals in many cases exhibit a DC drift that should be removed prior to further data analysis. Polynomial fitting and moving average removal method have been used to remove trends of electrochemical noise (EN) in time domain. The corrosion inhibition of synthesized schiff base N,N'-bis(3,5-dihydroxyacetophenone)-2,2-dimethylpropandiimine on API-5L-X70 steel in hydrochloric acid solutions were used to study the effects of drifts removal methods on noise resistance calculation. Also, electrochemical impedance spectroscopy (EIS) was used to study the corrosion inhibition property of the inhibitor. The results showed that for the calculation of $R_n$, both methods were effective in trend removal and the polynomial with m=4 and MAR with p=40 were in agreement.
Goodarzi, A.,Danaee, I.,Eskandari, H.,Nikmanesh, S. The Korean Electrochemical Society 2016 Journal of electrochemical science and technology Vol.7 No.1
The corrosion behavior of duplex stainless steel AISI 2205 was investigated in ethylene glycol-water mixture in the presence of 50 W/V % LiBr at different concentrations and different temperatures. Cyclic polarization, impedance measurements and Mott-Schottky analysis were used to study the corrosion behavior the semi conductive properties of the passive films. The results showed that with increasing in the ethylene glycol concentration to 10 V/V%, the corrosion rate of the steel alloy substrate increased. In higher concentrations of ethylene glycol, corrosion current of steel decreased. The results of scanning electron microscopy of electrode surface confirmed the electrochemical tests. Electrochemical experiment showed that duplex steel was stable for pitting corrosion in this environment. The increase in the ethylene glycol concentration led to increasing the susceptibility to pitting corrosion. The corrosion current increased as the temperature rise and also pitting potentials and repassivation potentials shifted towards the less positive values as the temperature increased. According to Mott-Schottky analysis, passive films of stainless steel at the different temperatures showed both n-type and p-type semiconductor behavior in different potential.