@article { ISI:000243251100006, title = {Conducting polymer based hybrid nano-composites for enhanced corrosion protective coatings}, journal = {Progress in Organic Coatings}, volume = {57}, number = {4}, year = {2006}, month = {DEC}, pages = {332-336}, publisher = {ELSEVIER SCIENCE SA}, type = {Article}, address = {PO BOX 564, 1001 LAUSANNE, SWITZERLAND}, abstract = {

Hybrid composite coatings containing zinc oxide (ZnO) and polyaniline (PANI) as nano-additives dispersions were prepared with poly(vinyl acetate) (PVAc) as the major matrix. The steel plates dip-coated with these formulations were tested for corrosion protection by immersion in saline water over long periods. The Tafel plots for the determination of open circuit potential (OCP) and corrosion current (I-corr) were recorded. The coatings containing both ZnO and PANI showed improved corrosion resistance as compared to the single component coating. The I-corr values of PVAc-ZnO-PANI are found to be two-order magnitude lower than that of PVAc and PVAc-ZnO coatings. The results are explained on the basis of enhancement in barrier properties due to nano-particulate additives in PVAc-ZnO-PANI film together with the redox behaviour of PANI and protective oxide layer formation near the substrate. (C) 2006 Elsevier B.V All rights reserved.

}, keywords = {Coatings, corrosion, nano-additives, polyaniline, ZnO}, issn = {0300-9440}, doi = {10.1016/j.porgcoat.2006.09.012}, author = {Patil, R. C. and Radhakrishnan, S.} } @article { ISI:000243013800061, title = {Synthesis of poly(aniline-co-o-toluidine) coatings and their corrosion-protection performance on low-carbon steel}, journal = {Journal of Applied Polymer Science}, volume = {103}, number = {3}, year = {2007}, month = {FEB}, pages = {1868-1878}, publisher = {JOHN WILEY \& SONS INC}, type = {Article}, address = {111 RIVER ST, HOBOKEN, NJ 07030 USA}, abstract = {

Strongly adherent poly(aniline-co-o-toluidine) coatings were synthesized on low-carbon-steel substrates by the electrochemical copolymerization of aniline with o-toluidine with sodium tartrate as the supporting electrolyte. These coatings were characterized with cyclic voltammetry, ultraviolet-visible absorption spectroscopy, Fourier transform infrared spectroscopy, nuclear magnetic resonance spectroscopy, and scanning electron microscopy. The formation of the copolymer with the mixture of monomers in the aqueous sodium tartrate solution was ascertained by a critical comparison of the results obtained from the polymerizations of the individual monomers, aniline and o-toluidine. The optical absorption spectrum of the copolymer was drastically different from the spectra of the respective homopolymers, polyaniline and poly(o-toluidine). The extent of the corrosion protection offered by poly(aniline-co-o-toluidine) coatings to low-carbon steel was investigated in aqueous 3\% NaCl solutions by open-circuit-potential measurements and a potentiodynamic polarization technique. The results of the potentiodynamic polarization measurements showed that the poly(aniline-co-o-toluidine) coatings provided more effective corrosion protection to low-carbon steel than the respective homo-polymers. The corrosion rate depended on the feed ratio of o-toluidine used for the synthesis of the copolymer coatings. (c) 2006 Wiley Periodicals, Inc.

}, keywords = {Coatings, conducting polymers, copolymerization, synthesis}, issn = {0021-8995}, doi = {10.1002/app.25346}, author = {Pawar, Pritee and Sainkar, S. R. and Patil, P. P.} } @article { ISI:000248609900029, title = {Use of poly(o-toluidine)/ZrO2 nanocomposite coatings for the corrosion protection of mild steel}, journal = {Journal of Applied Polymer Science}, volume = {106}, number = {1}, year = {2007}, month = {OCT}, pages = {220-229}, publisher = {JOHN WILEY \& SONS INC}, type = {Article}, address = {111 RIVER ST, HOBOKEN, NJ 07030 USA}, abstract = {

This study explored the possibility of using poly(o-toluidine) (POT)/ZrO2 nanocomposite coatings for the corrosion protection of mild steel in a chloride environment. POT/ZrO2 nanocomposite coatings were synthesized on steel substrates through an electrochemical route. These coatings were characterized with cyclic voltammetry, ultraviolet-visible absorption spectroscopy, Fourier transform infrared spectroscopy, scanning electron microscopy, and X-ray photoelectron spectroscopy. The performance of POT/ZrO2 nanocomposites as protective coatings against the corrosion of mild steel in aqueous 3 wt \% NaCl was evaluated with the potentiodynamic polarization technique and electrochemical impedance spectroscopy. The results of this study demonstrate that POT/ZrO2 nanocomposite coatings provide better protection for mild steel against corrosion than pure POT coatings. The corrosion potential was about 0.312 V versus a saturated calomel electrode, more positive in aqueous 3 wt \% NaCl for the nanocomposite-coated steel than the uncoated steel, and the corrosion rate of steel was reduced by a factor of almost 51. (c) 2007 Wiley Periodicals, Inc.

}, keywords = {Coatings, conjugated polymers, FTIR, Nanocomposites, synthesis}, issn = {0021-8995}, doi = {10.1002/app.26469}, author = {Chaudhari, Sudeshna and Patil, P. P. and Mandale, A. B. and Patil, K. R. and Sainkar, S. R.} } @article { ISI:000365283700043, title = {Cationic photopolymerization kinetics of neat coating formulations involving poly(propylene glycol) diglycidyl ether and glycerol diglycidyl ether}, journal = {Journal of Thermal Analysis and Calorimetry}, volume = {122}, number = {3}, year = {2015}, month = {DEC}, pages = {1445-1454}, publisher = {SPRINGER}, address = {VAN GODEWIJCKSTRAAT 30, 3311 GZ DORDRECHT, NETHERLANDS}, abstract = {

Kinetic analysis of formulations based on poly(propylene glycol) diglycidyl ether and glycerol diglycidyl ether was carried out using photodifferential scanning calorimeter. The effects of formulation monomer ratios at different temperatures were studied as photocalorimetric optimization studies of formulation ratios involving diglycidyl ethers are less reported. The nature of cure was found to depend more on the in situ physical parameters rather than on the mechanism of the reaction. The variations in the observed kinetic parameters can be related to interplay of mobility of reactive species, distance of counter ion and the diffusional restrictions. The final conversion was found to increase with increase in poly(propylene glycol) diglycidyl ether content, while the thermal stability increased with an increase in glycerol diglycidyl ether content. Autocatalytic kinetic model was also evaluated, and the system underwent early gelation. The studies show that the intermediate formulations are promising compositions for surface-coating applications.

}, keywords = {Coatings, Diglycidyl ether, kinetics, PhotoDSC, Photopolymerization}, issn = {1388-6150}, doi = {10.1007/s10973-015-4967-4}, author = {Harikrishna, Reghunathan} } @article {43969, title = {Magnetic studies of SiO2 coated CoFe2O4 nanoparticles}, journal = {Journal of Magnetism and Magnetic Materials}, volume = {441}, year = {2017}, month = {NOV}, pages = { 683-690}, type = {Journal Article}, abstract = {Oleic acid capped CoFe2O4 nanoparticles which exhibit a high coercivity of \~{}9.47 kOe at room temperature were coated with a robust coating of SiO2. We have used chemical synthesis method to obtain SiO2 coated CoFe2O4 nanoparticles with different weight percentages of CoFe2O4 in SiO2 (1.5, 3.1 and 4.8 wt.\%). The morphological investigation of the coated nanoparticles by transmission electron microscopy shows that the particles are spherical with average size \~{}160 nm. Infrared spectroscopy reveals that oleic acid capping on the surface of CoFe2O4 nanoparticles is retained after silica coating process. The complete coating of SiO2 on CoFe2O4 nanoparticles is confirmed by X-ray photoelectron spectroscopy as there is no signature of cobalt or iron ions on the surface. Magnetic measurements show that coercivity of SiO2 coated CoFe2O4 particles remains more or less unaffected as in CoFe2O4 nanoparticles at room temperature. In addition, the temperature dependent magnetic measurements show that at 5 K the CoFe2O4 and SiO2 coated 1.5 wt.\% CoFe2O4 samples exhibit a very high value of coercivity (\~{}20 kOe) which is more than twice as compared to room temperature coercivity value (\~{}9.47 kOe). We conclude that silica coating in our study does not significantly affect the coercivity of CoFe2O4 nanoparticles.}, keywords = {Coatings, coercive force, High Resolution Transmission Elctron Microscopy, infrared spectroscopy, Magnetic materials}, doi = { 10.1016/j.jmmm.2017.06.061}, author = {Limaye, M.V.}, editor = {Singh, S.B.} }