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release rate kinetics of corrosion inhibitor loaded halloysite nanotube-based anticorrosion coatings on magnesium alloy AZ91D

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Journal of Magnesium and Alloys 2021年第1期9卷 202-215页

作者： Swapnil H.Adsul Uday D.Bagale Shirish H.Sonawane r.subasri Centre for Sol-Gel Coatings International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI)BalapurHyderabad 500005Telangana StateIndia Department of Food and Biotechnology South Ural State UniversityChelyabinsk 454080Russia Department of Chemical Engineering National Institute of TechnologyWarangal 506004Telangana StateIndia

Halloysite nanotubes were used as nanocontainers to hold corrosion inhibitors such as Ce^(3+)-Zr^(4+),2-mercaptobenzothiazole and 8-hydroxyquinoline in their *** acid assisted etching of the nanotubes was carried out with a view to increase the lumen diameter and thereby,increase the amount of loading of the corrosion *** morphology of as-received and etched halloysite nanotubes was ob-served using TEM *** loading of corrosion inhibitors was confirmed using SEM-EDS and BET *** microcapsules were used as capping agents for the ends of the loaded HNTs following which,they were dispersed into a hybrid sol-gel silica *** coating method was used to generate coatings on AZ91D substrates followed by heat treatment at 130℃ for 1 *** release rate kinetics of corrosion inhibitors from as-received and etched nanotubes was investigated in buffer solutions of 3.5 wt%NaCl at different *** release mechanism of corrosion inhibitors from the HNT lumen was validated using various semi-empirical *** were also evaluated for their corrosion protection ability using electrochemical techniques after exposure to 3.5 wt%NaCl solution for 120 *** generated using Ce^(3+)-Zr^(4+)loaded into as-received halloysite nanotubes have shown more effective corrosion protection when compared to other corrosion inhibitors after 120 h exposure to the corrosive medium.

关键词： Sol-gel coating Halloysite nanotubes Corrosion inhibitors release rate Magnesium alloy AZ91D

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A New Species of Cat Snake(Serpentes:Colubridae) Morphologically Similar to Boiga cynodon from the Nusa Tenggara Islands,Indonesia

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Asian Herpetological research 2010年第1期1卷 22-30页

作者： Gilang ramadhan Djoko T.Iskandar Dadang r.subasri School of Life Sciences and Technology Institut Teknologi Bandung10Jalan Ganesa Museum Zoologicum Bogoriense Research Centre for Biologythe Indonesian Institute of SciencesCibinong

We describe a new cat snake species of the genus Boiga from the Nusa Tenggara Islands, Indonesia. The new species is superficially similar to Boiga cynodon, as it was identified previously. It differs from the latter species by the following combination of characteristics: only reaching half of the size of B. cynodon(up to 1250 mm SVL), higher number of dorsal scales; lower ventral and subcaudal counts and having only a very fine postorbital stripe.

关键词： Lesser Sunda Islands Boiga description taxonomy biogeography

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Evaluation of self-healing properties of inhibitor loaded nanoclay-based anticorrosive coatings on magnesium alloy AZ91D

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Journal of Magnesium and Alloys 2018年第3期6卷 299-308页

作者： Swapnil H.Adsul K.r.C.Soma raju B.V.Sarada Shirish H.Sonawane r.subasri Centre for Sol-Gel Coatings International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI)BalapurHyderabad 500005TelanganaIndia Centre for Solar Energy Materials International Advanced Research Centre for Powder Metallurgy and New Materials(ARCI)BalapurHyderabad 500005TelanganaIndia Department of Chemical Engineering National Institute of TechnologyWarangal 506004TelanganaIndia

This study emphasizes on the evaluation and comparison of the anticorrosive properties of sol-gel coatings with and without inhibitor loaded *** this case,naturally available clay nanotubes(halloysite)were loaded with cationic corrosion inhibitors Ce 3+/Zr 4+.These nanocontainers were dispersed in hybrid organic-inorganic sol-gel matrix *** was applied on magnesium alloy AZ91D using the sols containing modified and unmodified nanocontainers employing the dip coating method and cured at 130℃for 1 h in *** resistance of coated/uncoated substrates were analyzed using electrochemical impedance spectroscopy,potentiodynamic polarization and weight loss measurements after exposure to 3.5 wt%NaCl solution for varying time durations between 24 h to 120 ***-healing ability of coatings was evaluated by micro-raman spectroscopy after 120 h exposure to 3.5 wt%NaCl *** generated after dispersion of corrosion inhibitor loaded clay in hybrid sol-gel matrix have shown more promising corrosion resistance when compared to just the sol-gel matrix coatings,after prolonged exposure to corrosive environment.

关键词： Self-healing coating Halloysite nanoclay Cationic corrosion inhibitors Magnesium alloy AZ91D Micro-raman spectroscopy Corrosion protection

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research progress in rare earths and their composites based electrode materials for supercapacitors

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Green Energy & Environment 2020年第3期5卷 259-273页

作者： subasri Arunachalam Balakrishnan Kirubasankar Duo Pan Hu Liu Chao Yan Zhanhu Guo Subramania Angaiah Electro-Materials research Laboratory Centre for Nanoscience and TechnologyPondicherry UniversityPondicherry605014India School of Materials Science and Engineering Jiangsu University of Science and TechnologyZhenjiang212003China Key Laboratory of Materials Processing and Mold(Zhengzhou University) National Engineering Research Center for Advanced Polymer Processing TechnologyZhengzhou UniversityZhengzhou450002China Integrated Composites Laboratory(ICL) Department of Chemical and Biomolecular EngineeringUniversity of TennesseeKnoxvilleUSA

Supercapacitor is an imminent potential energy storage system,and acts as a booster to the batteries and fuel cells to provide necessary power *** the last decade,carbon and carbonaceous materials,conducting polymers and transition metal oxide/hydroxide based electrode materials have been made to show a remarkable electrochemical ***-earth materials have attracted significant research attention as an electrode material for supercapacitor applications based on their physicochemical *** this review,rare earth metals,rare earth metal oxides/hydroxides,rare-earth metal chalcogenides,rare-earth metal/carbon composites and rare-earth metal/metal oxide composites based electrode materials are discussed for *** also discuss the energy chemistry of rare-earth metal-based *** the factors that affect the performance of the electrode materials,their evaluation methods and supercapacitor performances are discussed in ***,the future outlook in rare-earth-based electrode materials is revealed towards its current developments for supercapacitor applications.

关键词： rare-earth metals rare-earth metal oxides rare earth metal hydroxides Supercapacitor Electrode materials

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Development of CeO_2 nanorods reinforced electrodeposited nickel nanocomposite coating and its tribological and corrosion resistance properties

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Journal of rare Earths 2018年第12期36卷 1319-1325页

作者： S.Shanmugasamy K.Balakrishnan A.subasri S.ramalingam A.Subramania Centre for Nanoscience and Technology Pondicherry University Department of Chemistry Kalasalingam University

A simple electrodeposition technique was used to prepare Ni-CeOnanorods composite coating(Ni-CeONrs) using Watt’s nickel plating bath containing CeOnanorods(Nrs) as the reinforcement phase under optimized process conditions. The X-ray diffraction analysis(XrD) was used for the structural analysis of Ni-CeONrs composite coatings and their average crystalline size is ～22 nm for pure Ni and ～18 nm,respectively. The crystalline structure is fcc for the Ni-CeOnanocomposite coatings. The surface morphology of the electrodeposited Ni-CeONrs composite coatings was analyzed by scanning electron microscopy(SEM). Microhardness of pure Ni and Ni-CeONrs composite coatings are found to be 253 HV and 824 HV, respectively. The inclusion of CeONrs increases the microhardness of Ni-CeONrs composite coatings. The corrosion resistance behavior of Ni-CeONrs composite coating was evaluated by Tafel polarization and AC impedance methods. It is revealed that CeONrs reinforced Ni matrix shows higher microhardness and corrosion resistance than existing reported electrodeposited pure Ni and CeOnanoparticles reinforced Ni coatings.

关键词： CeO_2 nanorods rare earths Electrodeposition Nanocomposite coating Microhardness

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