The electrochemical and theoretical studies of corrosion inhibition of aluminium in acidic and basic solutions by Benzene-1,2,4,5- Tetracarboxylic dianhydride (PMDH) / Zohreh Shahnavaz

The inhibitory activity of benzene -1, 2, 4, 5-tetracarboxylic dianhydride(pyromellitic dianhydride) on aluminium corrosion in hydrochloric acid (1.0 M HCl), sodium chloride (1.0 M NaCl) and potassium hydroxide (1.0 M KOH) was measured by means of electrochemical techniques such as electrochemical impedance spectroscopy(EIS) and polarization curves. The surface morphology was studied using scanning electron microscopy (SEM). The results indicate that benzene -1, 2, 4, 5-tetracarboxylic dianhydride suppress aluminium corrosion in these three media by its adsorption on the aluminium surface according to Langmuir adsorption isotherm. Potentiodynamic and EIS measurements indicate that the inhibition efficiency increases with the decrease in temperature and increase in the concentration of the inhibitor. On the other hand quantum chemical calculations show a correlation between molecular parameters and the corrosion behavior of PMDH

Enzyme-free glucose sensor based on ferrite magnetic nanoparticles / Zohreh Shahnavaz

Magnetic nanoparticles have gained great interest recently due to their unique properties which stood up as the candidate constructing novel sensing devices; particularly in electrochemical sensors. The main goal of this research is to develop a sensitive enzyme-free glucose sensor based on nanocomposite comprises of magnetic nanoparticles, embedded in polymer matrix or graphene oxide. This is accomplished by preparation of four types of nanocomposites, namely polypyrrole (PPy) coated copper iron oxide (CuFe2O4/PPy), polypyrrole coated zinc iron oxide (ZnFe2O4/PPy), copper iron oxide reduced graphene oxide (CuFe2O4/rGO) and zinc iron oxide reduced graphene oxide (ZnFe2O4/rGO). The morphology and surface property of coating phenomenon of prepared nanocomposites were examined by Transmission Electron Microscopy (TEM), Scanning Electron Microscopy (SEM), X-ray Diffraction (XRD) and Fourier Transform Infrared (FTIR). In the first two mentioned composites, SEM and TEM images displayed the spherical shape of CuFe2O4 and ZnFe2O4 nanoparticles with diameters ranging from 20 to 90 nm. The XRD and FTIR analyses confirmed that CuFe2O4 and ZnFe2O4 nanoparticles served as the nucleation sites for the polymerization of pyrrole as there is no chemical interaction between them. For the other two nanocomposites which were modified with reduced graphene oxide, SEM and TEM images showed the dispersion of magnetic nanoparticles on the graphene nanosheets which pre-synthesized via hydrothermal method. This finding is further confirmed by XRD and FTIR which supported the reduction of GO and the presence of ZnFe2O4 and CuFe2O4 nanoparticles which distributed within the graphene sheets. The sensor performance based on CuFe2O4/PPy nanocomposite showed a highly active electrochemical surface area and a fascinating electro-catalytic activity for the glucose oxidation. In the amperometric detection of glucose, CuFe2O4/PPy nanocomposite modified glassy carbon electrode exhibited detection limit and sensitivity of 0.1 μM an

Structural Relationships between Perceived Transformational Teaching and Critical Thinking: Mediating Role of Motivational Beliefs in College Students

The purpose of present study was to examine the structural relationship between perceived transformational teaching and critical thinking mediated by motivational beliefs (self-efficacy, intrinsic interest and test anxiety) among university students. The population in this study was all of the undergraduate students of Psychology of Islamic Azad University, Karaj Branch, Iran, in 2019-2020 academic year. From this population 384 students were selected using random stratified sampling method. The research instruments were Transformational Teaching Questionnaire (TTQ), The California Critical Thinking Disposition (CCTD) questionnaire and Motivated Strategies for Learning Questionnaire (MSLQ). The proposed model of the relationships between variables was tested using path analysis. According to results, proposed model had an acceptable fitness regarding fitness indices. In general, the results showed that perceived transformational teaching are effective both directly and indirectly through self-efficacy, intrinsic interest and test anxiety with critical thinking disposition

The structure elucidation of new mono-core dicationic salt-containing chlorosulfonate counterion: Raman study of a pure sample of chlorosulfonate anion in the solid and liquid state

This paper presents the design and synthesis of new ionic liquid containing dication of 1H,4H-piperazine-diium ring and two chlorosulfonate as counterions. The structure elucidation of new ionic organo-compound was performed by 1D and 2D NMR, FTIR, Raman, and mass spectrum. Then, the correct structure was elucidated by COSY which was supported by Raman study. IR and Raman spectra of liquid and solid-state of 1H,4H-piperazine-diium dichlorosulfonate are studied. Assignments are made for FTIR and Raman peaks, and our results are compared with previous reports in the literature. © 2020 Elsevier B.V

Arene diazonium saccharin intermediates: a greener and cost-effective alternative method for the preparation of aryl iodide

In the current protocol, the arene diazonium saccharin derivatives were initially produced from various substituted aromatic amines; subsequently, these intermediates were treated with a greener organic iodide for the preparation of the aryl iodide. We tried to choose low-cost, commercially available, biodegradable, recoverable, ecofriendly, and safe reagents and solvents. The arene diazonium saccharin intermediates could be stored in the liquid phase into a refrigerator for a long time with no significant loss activity. The outstanding merits of the current protocol (a) included the partial recovering of saccharin and tetraethylammonium salt, (b) reduce the use of solvents and the reaction steps due to eliminating separation and purification of intermediates, (c) good yield of the sterically hindered substrates, and (d) avoid the generation of heavy metal or corrosive waste. © TÜBİTA

Synthesis of a series of novel dihydro-[1,2,4]triazolo [1,5-a]pyrimidine scaffolds: Dual solvent-catalyst activity of a low viscous and acid-functionalized ionic liquid

The viscosity of neat ionic liquids is very important for their application in organic synthesis as a solvent because most of the neat ionic liquids are very viscous, which would result in the less efficient mass transfer of reactants. In the present study, a series of novel dihydro-[1,2,4]triazolo[1,5-a]pyrimidines were prepared using a low viscous and acid-functionalized ionic liquid. Our results showed that new ionic liquid can act as a green solvent and acid catalyst due to low viscosity and acid functionality. The products were simply extracted and the ionic liquid was retrieved several times without reducing its catalytic efficiency. The current application of TMDPS in the one-pot multicomponent reactions as dual solvent-catalyst highlights the importance of low viscous acid-functionalized ionic liquids in organic synthesis, and we hope that further research will be conducted in the future to finding other applications of TMDPS with promising results. © 2020, © 2020 Taylor & Francis Group, LLC

Additional file 1: Figure S1. of Can We Optimize Arc Discharge and Laser Ablation for Well-Controlled Carbon Nanotube Synthesis?

Schematic representation of the birth of CNT through various routes. (DOCX 2313 kb