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MUKHERJEE, G. S (2) answer(s).
 
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ID:   130749


Influence of temperature on the conformational guided physical / Pandit, Pallavi; Banerjee, Mandira; Mukherjee, G. S; Parikh, Rakesh, Deshpanday, U. P, Gupta, Ajay   Journal Article
Mukherjee, G. S Journal Article
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Publication 2014.
Summary/Abstract Poly (L lactic acid) (PLLA) ultrathin films of various thicknesses were prepared by spin coating method and investigated by using vibrational spectroscopic techniques such as FTIR and Raman. The analysis has been done in two parts: first one is verification of structural mode to understand the visibility of characteristic band to confirm the PLLA structure; where interestingly, as the thickness of the film increased, the structural features were found to be more explicit. The second part of the study was to observe the features of the film having been annealed for 1 h in two separate temperatures, one at specific annealing temperature 120 °C and the other at 160 °C to enable PLLA chains to reorient to get crystallized from its soften state at two such specific temperatures. The isothermal crystallization behavior of PLLA film at 120 °C and 160 °C from the melt was monitored by FTIR as well as Raman spectroscopies. More importantly, the band at 921 cm-1 corresponds to ? crystalline phase of PLLA has been observed even in this ultrathin film with the effective application of temperature as selected in this study.
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2
ID:   130743


Magnetic and microstructural studies on PVA/CO nanocomposite pr / Sachdev, Preeti; Banerjee, M; Mukherjee, G. S   Journal Article
Sachdev, Preeti Journal Article
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Publication 2014.
Summary/Abstract In this paper, we report the embedment of Cobalt (Co) nanoparticles by ion beam sputtering (IBS) in poly(vinylalcohol) (PVA) substrate to prepare nano composite film. The Co film of 5 nm was deposited on PVA by IBStechnique. Formation of Nano crystalline Co with HCP phase is revealed in GIXRD pattern of the film which alsoindicates that there is no change in the crystalline structure of PVA even after sputtering of the metallic nanoparticles.The average particle size of Co nanoparticles as evaluated using Scherer formula is found to be about 2 nm. UVVisabsorption spectrum of the film showed SPR peaks of Co metal in their nano size level embedded in the PVAmatrix system. XPS study confirms the metallic nature of Co MOKE studies show that the nanocomposite film isferromagnetic with HcÐÐ of. 42.8 Oe.
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