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( Sarikokba Diwakar Tiwari ),( Shailesh Kumar Prasad ),( Dong Jin Kim ),( Suk Soon Choi ),( Seung-mok Lee ) 한국공업화학회 2020 공업화학 Vol.31 No.3
The role of nano bio-composites precursor to chitosan are innumerable and are known for having different applications in various branches of physical sciences. The application to the sensor development is relatively new, where only few literature works are available to address the specific and critical analysis of nanocomposites in the subject area. The bio-composites are potential and having greater affinity towards the heavy metals and several micro-pollutants hence, perhaps are having wider implications in the low or even trace level detection of the pollutants. The nano-composites could show good selectivity and suitability for the detection of the pollutants as they are found in the complex matrix. However, the greater challenges are associated using the bio-composites, since the biomaterials are prone to be oxidized or reduced at an applied potential and found to be a hinderance for the detection of target pollutants. In addition, the materials could proceed with a series of electrochemical reactions, which could produce different by-products in analytical applications, resulting in several complex phenomena in electrochemical processes. Therefore, this review addresses critically various aspects of an evaluation of nano bio-composite materials in the electrochemical detection of heavy metals and micro-pollutants from aqueous solutions.
Sudhanshu Shekher Pati,Pranay Kant Prasad,Abhinav Kr Singh,Sandeep Singh,Shailesh Kumar Prasad 한국부식방식학회 2022 Corrosion Science and Technology Vol.21 No.2
A study on water-based epoxy coated on mild steel using the electroplating method was conducted to optimize the process parameters for dry film thickness to achieve superior paint quality at optimal cost in an automotive plant. The regression model was used to adjust various parameters such as electrode voltage, bath temperature, processing time, non-volatile matter, and surface area to optimize the dry film thickness. The average dry film thickness computed using the model was in the range of 15 – 35 μm. The error in the computed dry film thickness with reference to the experimentally measured dry film thickness value was - 0.5809%, which was well within the acceptable limits of all paint shop standards. Our study showed that the dry film thickness on mild steel was more sensitive to electrode voltage and bath temperature than processing time. Further, the presence of non-volatile matter was found to have the maximum impact on dry film thickness.
Lee, Han-Seung,Yang, Hyun-Min,Singh, Jitendra Kumar,Prasad, Shailesh Kumar,Yoo, Bongyoung Elsevier 2018 Construction and Building Materials Vol.173 No.-
<P><B>Abstract</B></P> <P>Inhibitor is one of the most accepted method to reduce, prolong the initiation of steel corrosion and increase the threshold value of Cl<SUP>−</SUP> and CO<SUB>3</SUB> <SUP>2−</SUP> ions. In present study, we have mixed sodium salt of phosphate and benzoate along with benzo triazole in water to prepare the inhibitor. Open circuit potential (OCP) results show that 5 v/v% inhibitor was exhibited most positive (nobler) potential than others at its prolonged exposure in simulated concrete pore (SCP) + 3.5 wt% NaCl solution. The OCP of 3 and 5% inhibitor containing solution proved that these concentrations are away from under corrosion region of steel rebar even after 192 h of exposure in SCP + 3.5 wt% NaCl solution. Electrochemical impedance spectroscopy (EIS) results show that the charge transfers resistance (R<SUB>ct</SUB>) to be highest for 5% inhibitor and gradually decreased once the concentration was reduced with exposure periods. Potentiodynamic studies reveal that inhibitor shows passive properties due to adsorption of inhibitor molecules on steel surface and enhance the corrosion resistance properties. The efficiency was calculated using R<SUB>ct</SUB> and corrosion current density (I<SUB>corr</SUB>) process and found that 3 and 5% inhibitor exhibit around 89 and 96%, respectively after 1 h of exposure in SCP + 3.5 wt% NaCl solution.</P> <P><B>Highlights</B></P> <P> <UL> <LI> The prepared inhibitor has worked effectively to reduce the corrosion of steel. </LI> <LI> Synthesized inhibitor work as anodic inhibitor. </LI> <LI> High concentration of inhibitor is required to mitigate the corrosion of steel. </LI> <LI> 96% efficiency was found for 5 v/v% inhibitor after 1 h of exposure. </LI> </UL> </P>