http://localhost:8080/xmlui/handle/123456789/201 2026-04-26T08:24:51Z http://localhost:8080/xmlui/handle/123456789/3211 Title: Intensification of corrosion resistance of 2 K epoxy coating by encapsulation of liquid inhibitor in nanocontainer core of sodium zinc molybdate and iron oxide Authors: Kapole, S.A.; Bhanvase, B.A.; Pinjari, D.V.; Kulkarni, R.D.; Patil, U.D.; Gogate, P.R.; Sonawane, S.H.; Pandit, A.B. Abstract: A unique approach for the synthesis of an iron oxide-blended sodium zinc molybdate nanocontainer using an ultrasound-assisted method and its application for 2 K epoxy polyamide nanocomposite coatings has been presented. Sodium zinc molybdate blended with iron oxide was used as the core of the nanocontainer and layer-by-layer assembly of oppositely charged species of polyelectrolyte and inhibitor was made over this core of nanoparticles. The release of imidazole from iron oxide-blended sodium zinc molybdate nanocontainer has been quantitatively evaluated in water at different pH. It has been observed that imidazole plays a major role in the release profile of polyelectrolyte-modified nanocontainer and deciding the corrosion inhibition characteristics. Addition of 4 wt% nanocontainer in coatings results in shifting of corrosion potential (Ecorr) value towards positive direction. The maximum concentration of imidazole released at the end of 1 h was found to be 0.545 mg L−1 /g of nanocontainer at pH of 10. The results of corrosion rate analysis, Tafel plots and electrochemical impedance spectroscopy studies of an iron oxide-blended sodium zinc molybdate nanocontainer-based coatings indicated better inhibition performance compared with neat coating. Description: NITW 2014-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/3204 Title: Reducing Sugars Production from Corncobs: A Comparative Study of Chemical and Biotechnological Methods Authors: Potumarthi, Ravichandra; Baadhe, Rama Raju; Pisipat, Aparna; Jetty, Annapurna Abstract: Two commonly used chemical pretreatment processes, sulphuric acid, and sodium hydroxide, were tested to provide comparative performance data. A connection between solid to liquid ratio (S/L) and sugars released was observed with an increase in S/L ratio between 0.02 and 0.2. Enzymatic digestibility of 1 M of NaOH-pretreated corncobs were released 210.7 mg ml−1 of sugars. Further, compared with different concentrations of acid pretreatments at 0.05, 0.1, 0.15, 0.2, 0.25, 0.3, and 0.5 M concentrations, sodium hydroxide pretreatment of corncob substantially increased accessibility and digestibility of cellulose. Another additional observation made was whole-cell and crude enzymatic hydrolysis of different concentrations of acid and NaOH (0.05, 0.1, 0.25 M)-treated materials released lower amount of sugars compared with the sugars released (310.9 mg ml−1 ) with whole-cell hydrolysis of 1 M of NaOH-treated corncobs. NaOH-pretreated corncobs contained higher content of sugars and which is more suitable for production of reducing sugars Description: NITW 2014-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/3110 Title: Comparative kinetics of esterification of methanol-acetic acid in the presence of liquid and solid catalysts Authors: Mekala, Mallaiah; Goli, Venkat Reddy Abstract: Esterification of acetic acid with methanol to produce methyl acetate in an isothermal stirred batch reactor has been studied. Sulfuric acid was used as a liquid catalyst, and Indion-180, Indion-190 and Amberlyst-16wet ion exchange resins were used as solid catalysts. The feed mole ratio was varied from 1 : 1 to 1 : 4. The reaction temperatures were varied from 305.15 to 333.15 K for sulfuric acid as catalyst and 323.15 to 353.15 K for the solid catalysts. The catalyst concentrations were used in the range of 1% to 5%, for the sulfuric acid catalyst, and 0.01 to 0.05 g/cc, for the solid catalysts. The effect of temperature, catalyst concentration, agitation speed, size of catalyst particle and reactant concentration on the acetic acid conversion was investigated. A second-order kinetic rate equation was proposed to fit the experimental data. For both forward and backward reactions, the activation energies were estimated from Arrhenius plots. The reaction rate increased with catalyst concentration and temperature for both the liquid and solid catalysts. The acetic acid conversion was found to increase with increases in acetic acid to methanol ratio in the feed. The developed kinetic rate equation was used for the simulation of reactive distillation process, in our laboratory column. © 2014 Curtin University of Technology and John Wiley & Sons, Ltd. Description: NITW 2014-01-01T00:00:00Z http://localhost:8080/xmlui/handle/123456789/3083 Title: Kinetic studies of semibatch emulsion copolymerization of methyl methacrylate and styrene in the presence of high intensity ultrasound and initiator Authors: Bhanvase, Bharat A.; Sonawane, Shirish H.; Pinjari, Dipak V.; Gogate, Parag R.; Pandit, Aniruddha B. Abstract: The present work deals with kinetic studies of copolymerization of methyl methacrylate and styrene using ultrasound assisted semibatch emulsion copolymerization in the presence of sodium dodecyl sulfate (emulsifier) and potassium persulfate (external initiator). The effect of temperature, acoustic intensity, initiator loading, surfactant concentration and monomer concentration on the extent of conversion has been investigated. The extent of polymerization was observed to increase with an increase in the temperature, and concentrations of initiator, monomer and surfactant. Further, the initial polymerization rate increased with an increase in the acoustic intensity from 11.2 to 23.1Wcm2 and thenit wasfoundtodecreasewithafurtherincreaseto33.80Wcm2.Thenoveltyofthisworkliesinthe fact that there have been only limited kinetic studies for the approach of ultrasound assisted emulsion copolymerization. It has been also established in the present work that the formation of fine and stable monomer droplets, due to the cavitational activity at/near the interface of immiscible monomer phase and subsequent disruption by micro jets, leads to the smaller final polymer particle size and under optimized conditions, it was found to be about 40nm. Description: NITW 2014-01-01T00:00:00Z