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Maitra S.,Mitra R.,Nath T.K. 한국물리학회 2021 Current Applied Physics Vol.27 No.-
Herein this work, we have used the sol-gel chemical synthesis method to prepare spherical shaped MgFe2O4 nanoparticles having size 45–50 nm. Using 1 mol L 1 Sodium Perchlorate (NaClO4) electrolyte, a capacitance of 61 F/g, a capacitance retention of 82.91% (after undergoing 1000 cycles), and an energy density of 41 Wh/kg have been achieved. Using 1 mol L 1 Magnesium Perchlorate (Mg(ClO4)2) as electrolyte, a capacitance of 43 F/g, a capacitance retention of 82.15%, and an energy density of 29 Wh/kg have been realized. Furthermore, MgFe2O4 nanospheres exhibited an overpotential (η) = 1.09 V, a Tafel slope (b) = 317 mV/dec in regard to alkaline Oxygen Evolution Reaction (OER) electrocatalyst. It also achieved η = 402 mV and b = 241 mV/dec in regard towards alkaline Hydrogen Evolution Reaction (HER) electrocatalyst. These results signify the suitability of MgFe2O4 nanoparticles for high energy density aqueous supercapacitor and water splitting electrocatalyst applications.
S. Maitra,R. Mitra,T.K. Nath 한국물리학회 2020 Current Applied Physics Vol.20 No.5
In this work, we have successfully synthesized MgNiO2 using a sol-gel wet chemical synthesis technique named MNO - 3. Electrochemical measurements in the presence of aqueous 1 M Li2SO4 electrolyte indicate that MNO - 3 samples exhibit a capacitance value of about 30 F/g and an energy density of about 20 Wh/kg. Subsequently, in the experiment involving aqueous 0.5 M Na2SO4 electrolyte system, it has been found that the capacitance for MNO - 3 sample is about 34 F/g and the energy density is about 23 Wh/kg for MNO - 3 sample. Finally, in the presence of aqueous-based 1 M Mg(ClO4)2 electrolyte, MNO - 3 sample is found to exhibit a capacitance of about 26 F/g and an energy density of about 17 Wh/kg, respectively. In all three electrolyte systems, the MNO -3 sample exhibit a long cycle capacitance retention of greater than 85% for 1000 charge-discharge cycles.
A Comparison of the Cationic Ring-Opening Polymerizations of 3-Oxetanol and Glycidol
A. Timothy Royappa,Mitra R. Vashi,Cholena L. Russo,Aaron C. Blackwell 한국고분자학회 2013 Macromolecular Research Vol.21 No.10
The technologically important polymers poly(3-oxetanol) and polyglycidol (sometimes referred to as polyglycerol) were both synthesized in high yield by a one-pot BF3-catalyzed cationic ring-opening polymerization of the respective monomers in dichloromethane at ambient temperature. The polymerization reactions and the resulting polymers were compared. The polymerization of 3-oxetanol was less exothermic than the polymerization of glycidol under identical reaction conditions, because of the lower ring strain in 3-oxetanol than in glycidol, confirmed by semi-empirical calculations. The resulting polymers were similar, i.e., they had similar Fourier transform infrared spectroscopy (FTIR) and nuclear magnetic resonance (NMR) spectra, molecular weights, thermal properties and physical characteristics. However, the poly(3-oxetanol) had a higher ratio of secondary to primary alcohols than did polyglycidol.
S. Maitra,P.K. Chakraborty,R. Mitra,T.K. Nath 한국물리학회 2020 Current Applied Physics Vol.20 No.12
We report here the cost-effective synthesis of Magnesium Cobalt Oxide (MgCoO2) sample by the sol-gel synthesis route labeled as MCO - 3. In presence of aqueous 1 M Lithium Sulphate (Li2SO4) electrolyte, we obtained a capacitance of 56 F/g, an energy density of 38 Wh/kg and a capacitance retention of 92.53 % (at 5 A/g) after undergoing 1000 charge-discharge cycles. For the aqueous 1 M Sodium Perchlorate (NaClO4) electrolyte system, we found the capacitance, energy density and capacitance retention of 47 F/g, 31 Wh/kg and 91.41% (at 3.5 A/g for 1000 charge-discharge cycles), respectively. These results establish MgCoO2 as suitable electrode material in aqueous lithium-ion and sodium-ion supercapacitor devices. Further, MCO - 3 in the presence of aqueous 1 M Potassium Hydroxide (KOH) electrolyte showed an overpotential of 400 mV and a Tafel slope of 174 mV/dec, making it a suitable candidate for alkaline Hydrogen Evolution Reaction (HER) electrocatalyst.
Symmetric key end to end Cryptosystem using Plateaued functions and Hadamard matrix
P. Poojary,K. Prakasha,P. K. Harikrishnan,G. R. Vadiraja Bhatta,Deepmala,A. Mitra 장전수학회 2020 Proceedings of the Jangjeon mathematical society Vol.23 No.1
Hadamard matrices are a special type of matrices having various applications in cryptography. Here we present a method for the construction of Hadamard matrices using plateaued Boolean functions. The key generated using Hadamard matrices is used for end to end encryption of the messages using symmetric key cryptography. The performance of the proposed system is compared with the Advanced Encryption Standard (AES), and RSA cryptosystems. The results prove that the proposed system outperforms existing systems.
Electrophoretic pattern of seed proteins of perilla
수실런(K. N. Suseelan),방진기(Jin Ki Bang),미트라(R. Mitra) 한국육종학회 1996 한국육종학회지 Vol.28 No.4
Total seed proteins of 26 accessions of perilla were analysed by SDS-PAGE. The major polypeptides were separated into three zones. Zone 1 consisted of a single polypeptide of molecular weight of 47.8 kDa, while Zone 2 had four polypeptides of 31.6, 30.9, 30.2 and 29.5 kDa and Zone 3 showed three polypeptides of 22.3, 21.8 and 20.9 kDa. SDS-PAGE of unreduced proteins demonstrated that the polypeptides of Zone 2 and 3 were the products of larger polypeptides with S-S linkage. A polypeptide of 27.5 kDa was resolved between Zone 2 and Zone 3 and appeared to be single polypeptide component. A radiation-induced mutant did not show this polypeptide. All the accessions had similar electrophoretic pattern suggesting a narrow genetic base of the accessions. The perilla seed protein pattern has similarity with legumin and vicilin-like proteins, usually present in legumes.
A rapid and simple technique for determination of α-linolenic acid by spot test in perilla seeds
방진기(Jin Ki Bang),바이댜(Umesh. J. Vaidya),크리쉬나(T.G. Krishna),미트라(R. Mitra) 한국육종학회 1996 한국육종학회지 Vol.28 No.4
The objective of this study was to establish the effective use of spot test for early selection of perilla mutants which have low α-linolenic acid in seed oil. The average α-linolenic acid content with 30 accessions determined by GLC was 57.9% and the contents ranged from 51.4 to 65.6%. The results of spot test, red colour is related to high α-linolenic acid content in perilla whereas yellow colour indicates absence of α-linolenic acid. The colour density by an image analysis was highest in perilla among oil crops tested. The correlation coefficient between colour density by spot test and α-linolenic acid content determined by GLC was highly significant. Therefore, the spot test was considered useful as a preliminary screening method for the relative α-linolenic acid content in mutation breeding.