Sreegopal Banerjee College

Magra, India

Sreegopal Banerjee College

Magra, India
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Bhaskar U.K.,Sreegopal Banerjee College | Bid S.,Academy of Technology | Pradhan S.K.,University of Burdwan
Journal of Alloys and Compounds | Year: 2011

Nanocrystalline stoichiometric Ti0.9Al0.1N powder has been prepared by ball-milling the α-Ti (hcp) and aluminum (fcc) powders under N2 at room temperature. Initially, α-Ti phase partially transformed to the transient cubic β-Ti phase and Ti0.9Al 0.1N (fcc) phase is noticed to form after 3 h of milling. Nanocrystalline stoichiometric Ti0.9Al0.1N phase is formed after 7 h of milling. After 1 h of milling, all Al atoms are diffused into the α-Ti matrix. The transient β-Ti phase is noticed to form after 1 h of milling and disappears completely after 7 h of milling. Microstructure characterization of unmilled and ball-milled powders by analyzing XRD patterns employing the Rietveld structure refinement reveals the inclusion of Al and nitrogen atoms into the Ti lattice on the way to formation of Ti 0.9Al0.1N phase. Microstructure of ball-milled samples is also characterized by HRTEM. The particle size of Ti0.9Al 0.1N phase, as obtained from XRD method, is ∼5 nm which is very close to that obtained from HRTEM. © 2010 Elsevier B.V. All rights reserved.


Dutta M.,Sreegopal Banerjee College | Dutta P.,Bejoy Narayan Mahavidyalaya
Oriental Journal of Chemistry | Year: 2013

The nutritional capacity of the fish Monopterus chuchia in terms of its fatty acid content was investigated to get an insight of their fatty acid composition in their most consumed part i.e. their muscle tissue. Our investigation shows the presence of SFA's like caproic acid, caprylic acid, palmitic acid, pentadecanoic acid, heptadecanoic acid, behenic acid, MUFA's like myristoleic acid, palmitoleic acid, oleic acid and nutritionally important PUFA's like Eicosapentaenoic acid, docosahexaenoic acid in major amount. Erucic acid, which is reported to be an anti-nutritional factor, is present in extremely low concentration. Thus the fish which is generally consumed by very few can be farmed as a cheap nutritional source for the masses.


Dutta P.,Bejoy Narayan Mahavidyalaya | Dutta M.,Sreegopal Banerjee College
Asian Journal of Chemistry | Year: 2012

Flavonoids constitute a large group of polyphenolic phytochemicals widely distributed in nature. The overwhelming capability of such species to act as an antioxidant by direct free radical scavenging and their capacity of metal chelation have made their properties a subject of continuous research. Herein, we wish to report a theoretical study, both in gas phase and in chloroform medium, carried out on two flavonoids namely 5-hydroxy-7,2'-dimethoxy flavone and 5,2'-dihydroxy-7,8-dimethoxy flavone derived from Limnophila indica species. Time dependent density functional theory calculations using the Gaussian 03 suite of programmes gives an excellent opportunity to predict structural and spectroscopic properties of such flavone species. Optimization of the flavonoids by HF, B3LYP, mPW1PW91 methods at 6-31++G(d,p) and 6-311+G(2d,p) levels confirmed their twisted structure. The UV-VIS spectra of both the flavones were calculated by time dependant density function theory under the polarizable continuum model and the results are in good agreement with the experimentally observed value. The theoretically calculated infrared absorption bands, 1H and 13C NMR spectra of these flavones agree well with the reported experimental data.


Bhaskar U.K.,Sreegopal Banerjee College | Pradhan S.K.,University of Burdwan
Materials Science and Engineering A | Year: 2012

The nanostructured Ti 0.9C 0.1N has been prepared by ball-milling the elemental stoichiometric powder mixture of Ti and graphite under nitrogen at room temperature. Within 1h of milling, the α-Ti (hcp) phase partially transformed to metastable β-Ti (cubic) phase and initiation of Ti 0.9C 0.1N (fcc) phase is noticed. Completely stoichiometric nanocrystalline Ti 0.9C 0.1N phase is obtained after 5h of milling. Microstructure characterization of unmilled and all ball-milled powders is made by analyzing their XRD patterns employing the Rietveld structure refinement method. The analysis reveals the inclusion of C and nitrogen atoms into the Ti lattice on the way to formation of Ti 0.9C 0.1N phase. The inclusion of C and nitrogen atoms in the α-Ti lattice is also confirmed by EDX. The microstructure of ball-milled samples is also characterized by HRTEM. The average size of almost monodispersed spherical particles of Ti 0.9C 0.1N is ~4nm which corroborates the finding of the Rietveld analysis. © 2011 Elsevier B.V..


Bhaskar U.K.,Sreegopal Banerjee College | Pradhan S.K.,University of Burdwan
Materials Chemistry and Physics | Year: 2012

Nano structured Ti(C x,N 1-x) (x = 0.1-0.5 mol fraction) cermets are prepared at room temperature in a single step by ball-milling the stoichiometric mixtures of elemental α-Ti and graphite powders under nitrogen atmosphere. Within 1 h of milling (for x = 0.1), the α-Ti (hcp) phase partially transformed to metastable β-Ti (cubic) phase and the initiation of Ti(C x,N 1 -x) (fcc) phase is noticed. Complete formation of Ti(C 0.1N 0.9) composition is observed after 5 h of milling and the other compositions are formed within 7 h of milling without any contamination either from the starting ingredients or from the milling media. Microstructure characterization of all unmilled and ball-milled powders is made by analyzing their respective X-ray diffraction (XRD) patterns employing the Rietveld structure refinement method. The microstructure of ball-milled samples is also characterized by high resolution transmission electron microscope (HRTEM). These analyses reveal the inclusion of both C and N atoms into the α-Ti lattice and confirm the average particle size of almost monodispersed spherical particles of Ti(C x,N 1-x) is ∼4 nm. The final compositions are also verified by energy dispersive X-ray (EDX) elemental analysis. Ti(C x,N 1- x) cermets are insulators and their optical band gap increases continuously from ∼4.58-5.38 eV with increasing C concentrations. © 2012 Elsevier B.V. All rights reserved.


Bhaskar U.K.,Sreegopal Banerjee College | Pradhan S.K.,University of Burdwan
Materials Research Bulletin | Year: 2013

Nanocrystalline stoichiometric Ti0.7Ni0.3N powder has been synthesized by ball-milling the α-Ti (hcp) and Ni (fcc) powders under N2 gas at room temperature. The α-Ti phase partially transforms to the transient (-Ti phase after 1 h of milling. After 5.5 h of milling, very broad reflections of Ti0.7Ni0.3N phase is noticed. Complete formation of Ti0.7Ni0.3N phase is observed after 9 h of milling. Microstructure in terms of lattice imperfections of unmilled and all ball-milled powder mixtures are primarily characterized by analyzing the X-ray powder diffraction patterns employing the Rietveld structure refinement procedure. It clearly reveals the presence of Ti 0.7Ni0.3N phase and inclusion of nitrogen atoms into the α-Ti-Ni matrix on the way to formation of nitride phase. Microstructure of the ball milled nitride powders is also characterized by HRTEM. Particle size of Ti0.7Ni0.3N phase obtained from XRD method of characterization is ∼5 nm which is very close to that obtained from HRTEM. © 2013 Elsevier Ltd. All rights reserved.


Dutta P.,Bejoy Narayan Mahavidyalaya | Dutta M.,Sreegopal Banerjee College
Oriental Journal of Chemistry | Year: 2014

Monthly and seasonal variation in the amount of total lipid and fatty acid in the muscle tissues of W. attu growing wild in large ponds was studied. The result depicts that both the amounts of total lipid and fatty acid varied monthly and thus seasonally in this fish species (boal) belonging to the family of fresh water silurid cat fishes. The percentage of total lipid value reaches its minimum in May and starts increasing from June to October. During breeding season the amount of total fatty acid also shows the same tendency to decrease till May when it reaches its minimum. From June onwards the total fatty acid increases significantly. At the end of the reproductive season, i.e. during the commencement of the nutritional season, the fishes start the process of storing energy in the form of lipids / fatty acids for future use i.e. during reproduction season or during scarcity of food. This is what is reflected in the study that, during the monsoon months in West Bengal the lipid / fatty acid content in the muscle tissues of boal rises to the maximum. This starts decreasing in the winter season as the reproduction period approaches and reaches its minimum in summer.


Dutta P.,Bejoy Narayan Mahavidyalaya | Dutta M.,Sreegopal Banerjee College
Asian Journal of Chemistry | Year: 2014

Fatty acid profiles of three major carps Catla catla, Labeo rohita and Cirrhinus mrigala found and consumed in West Bengal, India were investigated and compared to draw a conclusion on how rich they are in their fatty acid composition in their most consumed part i.e. their muscle tissues. After analysis we have found that all the three carps investigated are rich in poly unsaturated fatty acid and the major poly unsaturated fatty acids are docosahexaenoic acid, eicosapentaenoic acid and arachidonic acid. The major saturated fatty acids detected in all the three carps are palmitic acid (C16:0) and stearic acid (C18:0). Oleic acid (C18:1 n-9) is the major mono unsaturated fatty acid present in these carps. Erucic acid (C22:1 n-9), which is reported to be an antinutritional factor is present in very low concentration. Thus one can conclude that these three fish species if farmed meticulously i.e. given the proper growing conditions, can be nutritious and low cost healthy diet for the population of Bengal.


Bhaskar U.K.,Sreegopal Banerjee College | Satpati B.,Saha Institute of Nuclear Physics | Pradhan S.K.,University of Burdwan
Powder Technology | Year: 2013

The nanostructured (Ti0.9Si0.1)N powder has been mechanosynthesized by ball-milling the elemental stoichiometric mixture of α-Ti(0.9mol fraction) and Si (0.1mol fraction) powders at room temperature under nitrogen atmosphere. After 1h of milling, the α-Ti (hcp) phase partially transformed to metastable β-Ti (cubic) phase and the initiation of (Ti0.9Si0.1)N (fcc) phase is noticed. Completely stoichiometric nanocrystalline (Ti0.9Si0.1)N phase is obtained after 7h of milling. Microstructure of unmilled and ball-milled powders is characterized by analyzing their XRD patterns employing the Rietveld structure refinement method and by HRTEM images. The analysis reveals the inclusion of Si and nitrogen atoms into the Ti lattice on the way to formation of (Ti0.9Si0.1)N phase. Presence of Si and nitrogen in the ball milled powders is also confirmed from EDX spectra. The average size of almost monodispersed spherical particles of (Ti0.9Si0.1)N is ~4nm. Optical band gaps of TiN and TiSiN powders are measured from UV-vis absorption spectra and it has been found that the optical band gap of highly insulating TiN nanoparticles (band gap ~5.56eV) can be substantially reduced towards semiconductors (band gap ~3.96eV) by incorporating a small amount of Si into TiN matrix. © 2013 Elsevier B.V.


Bhaskar U.K.,Sreegopal Banerjee College | Bid S.,Academy of Technology | Satpati B.,CSIR - Institute of Minerals And Materials Technology | Pradhan S.K.,University of Burdwan
Journal of Alloys and Compounds | Year: 2010

Nanocrystalline stoichiometric TiN powder has been prepared by ball-milling the α-Ti powder under N2 gas at room temperature. The α-Ti phase is partially transformed to the transient β-Ti phase and TiN phase is noticed to form after 3 h of milling and nanocrystalline TiN phase is formed after 9 h of milling. Microstructure characterization of unmilled and ball-milled samples characterized primarily by X-ray diffraction employing the Rietveld structure refinement clearly reveals the presence of TiN phase and inclusion of nitrogen atoms in the α-Ti lattice in the way to formation of nitride phase. Transmission electron microscopy image confirms the presence of TiN phase and the size of TiN particles obtained from both XRD and TEM methods of characterization are very close in value (∼13 nm). © 2009 Elsevier B.V. All rights reserved.

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