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Anticorrosive properties of olive oil polyurethanamide/ZnO biocomposite coatings
Manawwer Alam,Naser Mohammed Alandis,Eram Sharmin,Fahmina Zafar,Mohammad Asif Alam 한국화학공학회 2016 Korean Journal of Chemical Engineering Vol.33 No.5
Olive oil based polyurethanamide/ZnO biocomposites were prepared by energy efficient microwave irradiation technique. The biocomposites showed good coating properties: scratch resistance, impact resistance, adhesion and flexibility retention. The corrosion studies carried out by potentiodynamic polarization measurements exhibit inhibition efficiency of 99.99% in 5% NaCl, 99.99% in 3.5% HCl, and 99.94% tap water, respectively. The overall approach is significant as it focuses on the utilization of vegetable oil, a sustainable material, polyurethanamide, synthesized through an energy efficient technique, at lower temperature, in lower reaction time, promoting value addition through simple chemistry. The coatings provide corrosion protection by barrier action.
Mohammad Asif Alam,Ubair Abdus Samad,Rawaiz Khan,Manawwer Alam,Saeed Mohammed Al-Zahrani 한국화학공학회 2017 Korean Journal of Chemical Engineering Vol.34 No.8
Various formulations of epoxy nano-composites coating were developed by incorporating the nanoparticles (NPs) of ZnO, ZrO2, and SiO2 (2 wt%) in commercially available epoxy resin as the matrix phase. Direct incorporation method was used for the addition of NPs in epoxy matrix. High-speed mechanical stirring and ultra-sonication were carried out to facilitate the dispersion of NPs in the presence of acetone used as a solvent. Coating of neat epoxy and NPs (ZnO, ZrO2, SiO2) doped coating was applied on mild steel substrate for corrosion analysis. The effect of the incorporation of various NPs on anti-corrosive properties of the epoxy/nano-composite coatings was investigated by electrochemical impedance spectroscopy technique. The experimental results showed an improvement in the anticorrosive properties for EZr coatings as compared with pristine and other nanocomposite coating samples.
Fekri Abdulraqeb Ahmed Ali,Javed Alam,Arun Kumar Shukla,Mansour Alhoshan,Jamal M. Khaled,Waheed A. Al-Masry,Naiyaf S. Alharbi,Manawwer Alam 한국공업화학회 2019 Journal of Industrial and Engineering Chemistry Vol.80 No.-
Biofouling leads to degradation of membrane performance characteristics, including permeability,selectivity, and long-term stability. In this study, silver-doped graphene oxide (GO) was employed as ananoadditive to enhance the biofouling resistance of thin-film nanocomposite (TFN) membranes viainterfacial polymerization. Ag functionalization on GO sheets was carried out by a reduction reaction. Electron microscopy, Raman spectroscopy, and X-ray diffraction analyses were conducted to evaluate Agattachment on GO. According to zeta potential and contact angle measurements as well as atomic forcemicroscopy results, GO-Ag-incorporated TFN membranes showed a high negative charge, hydrophilicity,and a smooth surface. Bovine serum albumin protein and Escherichia coli (E. coli) were used as modelfouling agents to demonstrate the antifouling characteristics of the membranes. The TFN membranecontaining 80 ppm of GO-Ag had a high waterflux recovery ratio (89%) and low irreversible resistance(10%) after hydraulic washing. The biofouling resistance of the membranes was further studied by acolony-counting method, while bacterial adhesion was analyzed by spinning disk confocal microscopeimaging. The TFN membrane prepared with 80 ppm GO-Ag reduced 86% of viable E. coli cells in bacterialsuspensions, with only slight bacterial adherence on the membrane surface.