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Memarian, Hamid Reza,Ira, Mohammadpoor Baltork,Bahrami, Kiumars Korean Chemical Society 2006 Bulletin of the Korean Chemical Society Vol.27 No.1
Photocatalytic electron transfer reactions of aryl benzyl sulfides using 2,4,6 triphenylpyrilium tetrafluoroborate ($TP^+BF_4^-$) resulted in the oxidation of these sulfides to the corresponding sulfoxides and also in most cases in the C-S bond cleavage of them along with formation of aromatic aldehydes. In these reactions, the formation of sulfide radical cation has been proposed, which undergoes either oxidation to the corresponding sulfoxide or C-S bond cleavage to the formation of aromatic aldehydes. The further oxidation of sulfoxides to sulfones has not been observed. The influence of substrate structures on the reaction pathways as well as the role of $O_2$ in this respect is discussed.
Farnaz Memarian,Masoud Latifi,Mohammad Amani-Tehran 한국공업화학회 2014 Journal of Industrial and Engineering Chemistry Vol.20 No.4
The different aspects of fabricating continuous TiO2 nanofiber yarns using oppositely charged metallic nozzles are studied. The importance of a proper auxiliary polymer, solvent and process required for continuous yarn formation are considered as effective process factors and are studied. Practical studies on solution concentration of the proposed polymer and solvent showed that it plays a significant role in the continuous electrospinning of nanofiber yarns and the diameter of nanofibers contained in the yarns.
TiO2 nanofiber yarns: A prospective candidate as a photocatalyst
Farnaz Memarian,Mohammad Amani-Tehran,Masoud Latifi 한국공업화학회 2015 Journal of Industrial and Engineering Chemistry Vol.23 No.-
Considering the efficient TiO2 structure on enhancing its photocatalytic behavior is of great interest in recent years. Meanwhile, inhibiting the filtration process for detachment of the catalyst from the purified solution is very advantages. To approach this purpose, TiO2 nanofiber yarns were successfully fabricated through the electrospinning technique using two oppositely charged nozzles followed by the calcinations process from a solution containing titanium precursor and polyvinyl acetate (PVAc) as the supporting material. The introduced nanofiber yarns eliminate the ultrasonic and centrifuge steps required in photocatalytic tests of nanoparticles and electrospun nanofibers. The results show that this new catalyst’s structure maintains its shape during the photocatalytic degradation process and can be easily removed from the purified water.
Mostafavi, Azam Sadat,Memarian, Maryam,Seddigh, Mohammad Ali The Korean Academy of Prosthodonitics 2021 The Journal of Advanced Prosthodontics Vol.13 No.1
Purpose. Implant mechanical complications, including screw loosening, can influence dental implant success. It has been shown that torque values are affected by contamination occurred in implant-abutment (I/A) interface. This study aimed to examine the effects of blood, saliva, fluoride and chlorhexidine contamination on reverse torque values (RTVs) of abutment screws in oral conditions. Materials and Methods. 50 fixtures were mounted into the stainless-steel holders and divided into five groups (n = 10). Except control group (NC), fixture screw holes in other groups were contaminated with chlorhexidine (CG), saliva (SG), blood (BG), or fluoride (FG). Abutment screws were tightened with a digital torque meter. I/A assemblies were subjected to thermocycling and cyclic loading. The mean RTVs were recorded and data were analyzed with one-way ANOVA and Tukey test. Results. Except for specimens in SG (20.56 ± 1.33), other specimens in BG (21.11 ± 1.54), CG (22.89 ± 1.1) and FG (24.00 ± 1.12) displayed significantly higher RTVs compared to NC (19.00 ± 1.87). The highest RTVs were detected in CG and FG. Conclusion. The obtained data robustly suggest that RTVs were significantly affected by fluid contaminations. Specimens in FG and CG displayed the highest RTVs. Therefore, clinicians should have enough knowledge about probable contaminations in I/A interface in order to manage them during clinical procedure and to inform patients about using oral care products.
Comparison of theoretical and experimental results for band-gap-graded CZTSSe solar cell
Mehran Minbashi,Mir Kazem Omrani,Nafiseh Memarian,김대환 한국물리학회 2017 Current Applied Physics Vol.17 No.10
The simulation of CZTSSe solar cells is presented in this paper. The simulation results are in reasonable agreement with the experimental data, indicating the reliability of simulation results. New structure is proposed to increase the functionality of the cell. Improved functional performances are achieved by inserting a P-Silicon (P-Si) layer as back surface field. Simulation results suggest that by inserting this P-Si layer, efficiency of the CZTSSe solar cell increases from 12.6% to 16.59%, which is a significant improvement. For the champion cell JSC ¼ 36.27 mA/cm2, VOC ¼ 0.625 V and FF ¼ 73.11% has been achieved.
Improve the performance of CZTSSe solar cells by applying a SnS BSF layer
Omrani, Mir Kazem,Minbashi, Mehran,Memarian, Nafiseh,Kim, Dae-Hwan Elsevier 2018 Solid-State Electronics Vol.141 No.-
<P><B>Abstract</B></P> <P>In this study, the CZTSSe (Cu<SUB>2</SUB>ZnSn(S,Se)<SUB>4</SUB>) solar cells, with Al/ZnO:Al/ZnO (i)/CdS/CZTSSe/Mo structure, have been simulated. The simulation results have been compared and validated with real experimental results. Next, suggestions for improving the performance of CZTSSe solar cell have been provided. A SnS layer has been used as back surface field (BSF) layer. Different physical parameters of SnS layer are investigated, and the optimum values are selected. It has been found that by inserting a BSF layer with optimum parameters, the efficiency of CZTSSe solar cell increases from 12.3% to 17.25% due to enhancement of both short-circuit current density (Jsc) and open circuit voltage (Voc). For this optimized cell structure, the maximum Jsc = 37.37 mA<I>/</I>cm<SUP>2</SUP>, Voc = 0.605 V, and fill factor = 76.28% are obtained under 1.5 AM illumination.</P> <P><B>Highlights</B></P> <P> <UL> <LI> Highest achieved efficiency for CZTSSe. </LI> <LI> Comparison and validation of simulation with an experimental case. </LI> <LI> Proposing a simple, experimentally available and structurally matched BSF to increase the efficiency. </LI> <LI> Optimization of the BSF layer parameters. </LI> </UL> </P>
Comparison of theoretical and experimental results for band-gap-graded CZTSSe solar cell
Minbashi, M.,Omrani, M.K.,Memarian, N.,Kim, D.H. ELSEVIER 2017 Current Applied Physics Vol.17 No.10
<P>The simulation of CZTSSe solar cells is presented in this paper. The simulation results are in reasonable agreement with the experimental data, indicating the reliability of simulation results. New structure is proposed to increase the functionality of the cell. Improved functional performances are achieved by inserting a P-Silicon (P-Si) layer as back surface field. Simulation results suggest that by inserting this P-Si layer, efficiency of the CZTSSe solar cell increases from 12.6% to 16.59%, which is a significant improvement. For the champion cell Jsc = 36.27 mA/cm(2), Voc = 0.625 V and FF = 73.11% has been achieved. (C) 2017 Elsevier B.V. All rights reserved.</P>