Yakha Vissurkhanova is a scientist working at Institute of Organic Synthesis and Chemistry of Coal of Kazakhstan Republic since 2012. She received a master’s degree of Natural Sciences in 2014. She completed her research work titled «Synthesis and physico-chemical studies of polymer-metal nanocomposites based on polyvinyl alcohol, polyaniline and 3d-metals» at Academician E. A. Buketov Karaganda State University, Kazakhstan. She current research interests are focused on the synthesis of 3d-metal doped polyaniline composites for hydrogenation of organic compounds. She has published more than 10 research papers in various national and interna-tional journals.

Metal-polymer composites on the base of conductive polymer polyaniline (PAni) have a number of practically valuable proper-ties. In particular, they are actively used as catalysts in catalytic reactions and as electrode coatings in electrocatalytic systems.rnThis paper presents the research results of the electrocatalytic activity of copper- and iron-containing PAni composites obtained by chemical methods in the processes of electrocatalytic hydro-genation of aromatic nitro-compounds, such as p-nitroaniline (p-NA) and p-nitrobenzoic acid (p-NBA). Copper- and iron-PANI composites were prepared by incorporating copper chloride (II) or iron oxide (FeO) in the reaction medium of oxidative polymeriza-tion of aniline (oxidizer – ammonium peroxydisulfate). The exper-iments on electrocatalytic hydrogenation were carried out in a diaphragm electrochemical cell in an alcohol–aqueous alkali catholyte. The anode was a Pt-gauze, the cathode was a Cu-plate, which closely contacted the bottom of the electrolyzer and served as a substrate for the PAni composite catalyst. The exper-iments were performed at a current of 1.5 A and a temperature of 30°C.rnBy X-ray analysis it is determined that in the constitution of PAni+CuCl2 composites synthesized with and without solvent evaporation procedure after applying them to activate the cath-ode in electrohydrogenation of p-NA there are the crystalline phases of Cu0 and copper oxides (Figure 1, a). In the constitution of PAni+FeO composites after hydrogenation of p-NBA there are crystalline phases of Fe0, FeO and Fe3O4 (Figure 1, b). The ap-pearance of copper and iron particles in zero-valence state in the composites indicates the passage of electrochemical reduction of metal cations from their compounds present in these composites before the hydrogenation processes. Exactly these metal parti-cles have a catalytic effect on the electrohydrogenation of p-NA and p-NBA. In the case, the hydrogenation rates and conversion of hydrogenated compounds increase in comparison with their electrochemical reduction on Cu-cathode. The main products of electrocatalytic hydrogenation of p-NA and p-NBA on PAni com-posites are the corresponding aromatic amino compounds

Mrs. Makarim H. Abdulkareem is a Ph.D. student in production engineering and Metallurgy/University of\r\nTechnology/Baghdad/Iraq. She is working as a Lecturer from 1994 at the same school where she is study. She had her bachelor\r\nin 1994 in Metallurgy engineering, and in 2000 she had her M.Sc. in Metallurgy engineering, she had study the Surface\r\nEngineering, the Ph.D. thesis subject concern with the electrophoretic deposition of nanobiocomposite material. Mrs. Makarim\r\nA. Abdulkareem has contributed greatly to the understanding of surface engineering of materials and deposition of\r\nnanobiocomposite material. Also she is a member in (TMS, JOM, AIST, and MRS) and she have published many research in her\r\nfield

Antibacterial activity was evaluated in vitro on functionally\r\ngraded coating (FGM) hydroxyapatite/yteria stabilized zirconia\r\ncoatings prepared by electrophoretic deposition on substrate of\r\nstainless steel 316L. Chitosan was used as a thin film on substrate\r\nand binder for coating layers. In this study two cases of\r\nfunctionally graded coatings were analyzed. Different processing\r\nparameter were employed (Voltage, time, concentration, and\r\ntemperature) for deposition..\r\nThe antibacterial activity test performed using N. agar and\r\ndiffusion methods. Two types of bacteria, E. Coli, and\r\nStaphylococcus were investigated on the performance of FGM.\r\nThe results showed that the FGM coatings revealed good\r\ninhibition effect towards E. coli and Staphylococcus within the\r\nincubation period. The effect against Staphylococcus (gram\r\npositive) was more than the effect against the E. coli (gram\r\nnegative). The high percentage of killed bacteria colonies for two\r\nkinds (E. coli and S. aureus) are high. Shape and dimensions of\r\nbacteria were investigated by optical microscope (OM) and\r\nscanning electron microscopy (SEM). It was found that the cell\r\nshape of E. coli gram negative bacteria in living state is rod shape\r\nwith length of about 2- 3 μm. The cell shape of gram positive\r\nStaphylococcus is circular with diameter about 1.84m.

Hayati Filik obtained his Ph.D. degree in analytical chemistry from Istanbul University, Istanbul, Turkey in 1993. He currently works as a Professor of chemistry at Istanbul University. His fields of interest are analytical chemistry, environmental chemistry and electroanalytical chemistry

Caffeine (CAF) is a natural stimulant most commonly found in some plant species. Caffeine is present naturally or added to widely consumed foods. It is also found in cola-type soft drinks and energy drinks that mainly contain artificial CAF. However, too much CAF consumption can cause the muscles effects for a move erratically. The quantity of the CAF in the matrix, whether it is the major compound or if it is found in trace quantity, is the very important topic. We introduce magnetic solid phase microextraction coupled with electrochemical detection. Screen-printed carbon electrode-based electrochemical detection has been successfully combined with m-SPME for the first time. SPCEs modified with conducting polymer (poly-alizarin red S) are employed as electrochemical transducers in the analyte detection stage. The Fe3O4 coated MWCNTs nanocomposite was prepared as a sorbent to quickly extract analyte from aqueous samples. m-SPME) is a well-known process for the enrichment of hydrophobic species from water sample without the use of toxic organic solvents. Miniaturisation of both analytical instrumentation and analytical methodologies has become very popular, and many efforts have focused on carrying out chemical analysis at a reduced scale. \r\nIn the study, the commercially available disposable screen-printed carbon electrodes modified with poly Alizarin Red S are employed as electrochemical sensors in the detection stage. However, the suitability of m-SPME for electroanalytical methods such as SWV has not been declared. With our optimized conditions in hand, the system response was linearly proportional to the concentration of caffeine in the range of 0.5–20 µM with a correlation coefficient of about 0.9987. The LOD of the sensing system at a signal to noise ratio of 3 was 0.05 µM. At the end of the study, the suitability of this new procedure for the analysis of energy drink and soft drink samples was demonstrated.\r\n